POLYSWITCH RESETTABLE
DEVICES
Telecommunications and Networking Devices
The PolySwitch families of telecommunications and
networking devices help meet the growing demand
for resettable overcurrent protection. These product
families help provide protection against damage caused
by power cross and power induction surges as defined
in ITU, Telcordia GR1089 and UL60950. Available in
chip, surface-mount and radial-leaded configurations,
Littelfuse’s PolySwitch devices help improve the reliability
of customer premise and network equipment worldwide.
BENEFITS
• Choice of many product options helps engineers by
improving design flexibility
• Compatible with high-volume electronics assembly
• Assist in meeting regulatory equipment requirements
• Help improve line balance
• Applicable for legacy POTS and modern digital
communications equipment
FEATURES
• RoHS compliant
• Resettable overcurrent protection
• Surface-mount, radial-leaded and chip form factors
• Fast time-to-trip
• Agency recognition: UL, CSA, TÜV
• Resistance-sorted and matched devices available
• Low parasitic capacitance/flat impedance with
frequency
APPLICATIONS
• Modems
• Phone sets
• Fax machines
• Phone wall outlets
• Alarm systems
• PBX systems
• MDF modules
• Analog and digital line cards
• T1/E1 equipment
• xDSL modems and splitters
• Powered ethernet systems
• VoIP (Voice over Internet Protocol) equipment
• LAN, WAN equipment
• Customer premise equipment
• Access network hardware
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To use this guide, follow the steps below:
1. Select your equipment type from the guide below.
2. Select the type of protection depending on the agency and regional specifications in the second column.
3. Select the form factor for your application.
4. Use the Agency Specification/ PolySwitch Device Selection Guide on the next page to select a specific part number for each application based on
the agency requirements.
5. Parts with fast time-to-trip or low resistance are available. Please consult a Littelfuse PolySwitch representative.
Region/
Specification
Overcurrent Protection
Form Factor
Application Radial-leaded Surface-mount Chip
Customer Premise equipment
IT equipment
Analog Modems, V.90 Modems,
ISDN Modems, xDSL Modems,
ADSL Splitters, Phone Sets, Fax Machines,
Answering Machines, Caller ID, Internet
Appliances, PBX Systems, POS Terminals,
Wall Plugs
North America TRF600-150 TS600-170F
TIA-968-A, TR600-150F-EX TS600-200F
UL 60950, TRF600-160 TSM600-250F
GR1089 Port Type 3‡TRF600-250 TSM600-400F
TRF-600-400
Europe/Asia/ TRF250-120 TS250-130F TCF250-120
South America TRF250-120T TSV250-130F TCF250-145
ITU K.21 TRF250-120U TSV250-184F TCF250-180T
TRF250-120UT TSL250-130F
TRF250-145
TRF250-145T
TRF250-145U
TRF250-180
TRF250-183
TRF250-183U
TRF250-184
Access network equipment (†)
Remote Terminals, Line Repeaters,
Multiplexers, Cross-Connects,
WAN Equipment
North America TRF600-160 TS600-170F
GR1089 Port Type 5‡TRF600-250 TS600-200F
TRF600-400 TS600-400F
TSM600-250F
TSM600-400F
Europe/Asia/ TRF250-120 TS250-130F TCF250-120
South America TRF250-120T TSV250-130F TCF250-145
ITU K.45 TRF250-120U TSV250-184F TCF250-180T
TRF250-120UT TSL250-130F
TRF250-145
TRF250-145T
TRF250-145U
TRF250-180
TRF250-183
TRF250-183U
TRF250-184
Application Guide for Telecommunications and Networking Devices*
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Region/
Specification
Overcurrent Protection
Form Factor
Application Radial-leaded Surface-mount Chip
Central office switching equipment (†)
Analog/POTS Linecards, ISDN Linecards,
xDSL Modems, ADSL/VDSL Splitters,
T1/E1 Linecards, Multiplexers,
CSU/DSU, Servers
North America TRF600-160 TS600-170F
GR1089 Port Type 1‡TRF600-250 TS600-200F
TRF600-400 TS600-400F
TSM600-250F
TSM600-400F
Europe/Asia/ TRF250-120 TS250-130F TCF250-120
South America TRF250-120T TSV250-130F TCF250-145
ITU K.20 TRF250-120U TSV250-184F TCF250-180T
TRF250-120UT TSL250-130F
TRF250-145
TRF250-145T
TRF250-145U
TRF250-180
TRF250-183
TRF250-183U
TRF250-184
Primary protection modules (†)
MDF modules, Network Interface
Devices (NID)
North America TRF250-180 TSV250-184F
Telcordia GR-974 TRF250-183
TRF250-184
Europe/Asia/ TRF250-055T TSL250-080F TCF250-100T
South America TRF250-055UT TS250-130F TCF250-120
ITU K.20 TRF250-080T TSV250-130F TCF250-120T
TRF250-080U TSV250-184F TCF250-145
TRF250-110U TSL250-130F TCF250-145T
TRF250-120 TCF250-180T
TRF250-120T
TRF250-120U
TRF250-120UT
TRF250-145
TRF250-145T
TRF250-145U
TRF250-180
TRF250-183
TRF250-183U
TRF250-184
Application Guide for Telecommunications and Networking Devices* (Cont’d)
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Application Guide for Telecommunications and Networking Devices* (Cont’d)
Region/
Specification
Overcurrent Protection
Form Factor
Application Radial-leaded Surface-mount Chip
Short-haul/intrabuilding communications
equipment (†)
LAN Equipment, VoIP Cards, Cable
Telephony NIUs, Wireless Local Loop
Handsets
North America TRF250-080T TSL250-080F TCF250-120
GR1089 Port Type 2‡TRF250-080U TS250-130F TCF250-145
GR1089 Port Type 4‡TRF250-120 TSV250-130F TCF250-180T
TRF250-120T TSV250-184F
TRF250-120U TSL250-130F
TRF250-120UT
TRF250-145
TRF250-145T
TRF250-145U
TRF250-180
TRF250-183
TRF250-183U
TRF250-184
Europe/Asia/ TRF250-120 TS250-130F TCF250-120
South America TRF250-120T TSV250-130F TCF250-145
ITU K.21 TRF250-120U TSV250-184F TCF250-180T
TRF250-120UT TSL250-130F
TRF250-145
TRF250-145T
TRF250-145U
TRF250-180
TRF250-183
TRF250-183U
TSV250-184
LAN Intrabuilding Power Cross Protection
LAN Equipment, VoIP Cards, IP Phones
North America TRF250-080T TSL250-080F TCF250-120
GR1089 Port Type 4‡TRF250-080U TS250-130F TCF250-145
TRF250-120 TSV250-130F TCF250-180T
TRF250-120T TSV250-184F
TRF250-120U TSL250-130F
TRF250-120UT
TRF250-145
TRF250-145T
TRF250-145U
TRF250-180
TRF250-183
TRF250-183U
TRF250-184
IEEE 802.3AF/AT Power over Ethernet protection
Powered Ethernet Switches and Terminals,
IP phones, Wireless LAN Base Stations,
Microcellular Base Stations, VoIP Cards
decaSMDC050F/60-2**
* This list is not exhaustive. Littelfuse welcomes our customers’ input for additional application ideas for PolySwitch resettable devices.
† For improved line balance in these applications, resistance-matched parts are recommended.
‡ May require additional impedance or coordination with primary protector.
** For details on decaSMDC050F/60-2, please refer to surface-mount devices product brochure.
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Use the guide below to select the PolySwitch devices which are typically used in your application. The following pages contain the specifications
for the part numbers recommended below. PolySwitch devices assist telecommunication equipment in meeting the applicable protection
requirements of these industry specifications. Refer to individual agency specifications for test procedures and circuit schematics. Users should
independently evaluate the suitability of and test each product for their application.
Family Product* Lightning Power Cross/Contact/Induction
TCF250 TCF250-100T ITU K.20 – 1.0kV 10/700µs PRC YD/T694
GR-1089 Port Types 2 and 4 – 1st Level ITU K.20/21/45 – 0.2A2s
ITU K.20/21/45 – 1A2s†
GR-1089 Port Type 4 – 120VAC, 25Asc
TCF250-120 ITU K.20/21/45 – 1.5kV 10/700µs ITU K.20/21/45 – 230VAC, 10Ω
TCF250-120T ITU K.20/21/45 – 4.0kV 10/700µs†ITU K.20/21/45 – 0.2A2s
TCF250-145 GR-1089 Port Types 2 and 4 – 1st Level ITU K.20/21/45 – 1A2s†
TCF250-145T ITU K.20/21/45 – 10A2s†
TCF250-180T GR-1089 Port Type 4 – 120VAC, 25Asc
TRF250 TRF250-055T ITU K.20 – 1.0kV 10/700µs ITU K.20 – 230VAC, 10Ω
TRF250-055UT GR-1089 Port Types 2 and 4 – 1st Level ITU K.20 – 0.2A2s
TRF250-080T ITU K.20 – 1A2s†
TRF250-080U GR-1089 Port Type 4 – 120VAC, 25Asc
TRF250-110U ITU K.20/21/45 – 1.5kV 10/700µs ITU K.20/21/45 – 230VAC, 10Ω
TRF250-120 ITU K.20/21/45 – 4.0kV 10/700µs†ITU K.20/21/45 – 0.2A2s
TRF250-120T GR-1089 Port Types 2 and 4 – 1st Level ITU K.20/21/45 – 1A2s†
TRF250-120U ITU K.20/21/45 – 10A2s†
TRF250-120UT GR-1089 Port Type 4 – 120VAC, 25Asc
TRF250-145
TRF250-145T
TRF250-145U
TRF250-180
TRF250-183
TRF250-183U
TRF250-184 ITU K.20/21/45 – 1.5kV 10/700µs ITU K.20/21/45 – 230VAC, 10Ω**
ITU K.20/21/45 – 4.0kV 10/700µs‡ITU K.20/21/45 – 0.2A2s
GR-1089 Port Types 2 and 4 – 1st Level ITU K.20/21/45 – 1A2s‡
ITU K.20/21/45 – 10A2s‡
GR-1089 Port Type 4 – 120VAC, 25Asc
TS250/TSV250 TSV250-130F ITU K.20/21/45 – 1.5kV 10/700µs ITU K.20/21/45 – 230VAC, 10Ω
TS250-130F ITU K.20/21/45 – 4.0kV 10/700µs†ITU K.20/21/45 – 0.2A2s
GR-1089 Port Types 2 and 4 – 1st Level ITU K.20/21/45 – 1A2s†
ITU K.20/21/45 – 10A2s†
GR-1089 Port Type 4 – 120VAC, 25Asc
TS250-130F-RB ITU K.20/21/45 – 1.5kV 10/700µs ITU K.20/21/45 – 230VAC, 10Ω
ITU K.20/21/45 – 4.0kV 10/700µs‡ITU K.20/21/45 – 0.2A2s
GR-1089 Port Types 2 and 4 – 1st Level ITU K.20/21/45 – 1A2s‡
ITU K.20/21/45 – 10A2s‡
GR-1089 Port Type 4 – 120VAC, 25Asc
TSV250-184F ITU K.20/21/45 – 1.5kV 10/700µs ITU K.20/21/45 – 230VAC, 10Ω**
ITU K.20/21/45 – 4.0kV 10/700µs‡ITU K.20/21/45 – 0.2A2s
GR-1089 Port Types 2 and 4 – 1st Level ITU K.20/21/45 – 1A2s‡
ITU K.20/21/45 – 10A2s‡
GR-1089 Port Type 4 – 120VAC, 25Asc
TSL250 TSL250-080F GR-1089 Port Types 2 and 4 – 1st Level GR-1089 Port Type 4 – 120VAC, 25Asc
TSL250-130F ITU K.20 – 1.0kV 10/700µs ITU K.20/21/45 – 230VAC, 10Ω
ITU K.20/21/45 – 0.2A2s
ITU K.20/21/45 – 1A2s†
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Notes: * Applies to all products that share the same prefix. † Tested with 230V gas discharge tube primary protector. ‡ Tested with 350V gas discharge tube primary protector.
** See SCD for additional application fault ratings.
†† May require additional series resistor to help telecommunication equipment pass Surge 3 (1kV, 10/1000µs).
Agency Specification/Selection Guide (Cont’d)
Family Product* Lightning Power Cross/Contact/Induction
TRF600 TRF600-150 TIA-968-A Types A & B UL60950 – 600VAC, 40Asc
TR600-150F-EX GR-1089 Port Types 1, 3 and 5 – 1st and 2nd Level†† UL60950 – 600VAC, 40Asc
TRF600-160 GR-1089 Port Types 1, 3 and 5 – 1st and 2nd Level†† Telcordia GR-1089 – 600VAC, 60Asc
TRF600-250 GR-1089 Port Types 1, 3 and 5 – 1st and 2nd Level†† Telcordia GR-1089 – 600VAC, 60Asc
TRF600-400 GR-1089 Port Types 1, 3 and 5 – 1st and 2nd Level Telcordia GR-1089 – 600VAC, 60Asc
TS600 TS600-170F TIA-968-A Types A & B UL60950 – 600VAC, 40Asc
TS600-200F GR-1089 Port Types 1, 3 and 5 – 1st and 2nd Level†† Telcordia GR-1089 – 600VAC, 60Asc
TS600-400F
TSM600 TSM600-250F TIA-968-A Types A & B UL60950 – 600VAC, 40Asc
GR-1089 Port Types 1, 3 and 5 – 1st and 2nd Level†† Telcordia GR-1089 – 600VAC, 60Asc
TSM600-400F TIA-968-A Types A & B UL60950 – 600VAC, 40Asc
GR-1089 Port Types 1, 3 and 5 – 1st and 2nd Level Telcordia GR-1089 – 600VAC, 60Asc
TCF250 TRF250 TS250 TSV250 TSL250
TS600
TSM600 TRF600
VMAX Interrupt (VAC)* 250 250 250 250 250 600 600
Specification
ITU
GR-1089
Ports 2 and 4
ITU
GR-1089
Ports 2 and 4
ITU
GR-1089
Ports 2 and 4
ITU
GR-1089
Ports 2 and 4
GR-1089
Ports 2 and 4
UL60950
GR-1089
Ports 1, 3 and 5
UL60950
GR-1089
Ports 1, 3 and 5
Hold Current (A)
0.055 —20.0Ω —————
0.080 —17.0Ω — — 8.0Ω — —
0.100 11.0Ω ——————
0.110 —7.0Ω —————
0.120 10.5Ω 8.0Ω —————
0.130 — — 9.0Ω 5.5Ω 5.5Ω — —
0.145 7.0Ω 4.5Ω —————
0.150 ——————8.0Ω
0.160 ——————6.0Ω
0.170 —————11.0Ω —
0.183 —1.3Ω —————
0.184 —1.9Ω —1.6Ω ———
0.200 —————8.5Ω —
0.250 —————3.5Ω 3.0Ω
0.400 —————1.2Ω 1.2Ω
Voltage Ratings for Telecommunications and Networking Devices
For circuit protection telecommunications devices there are two applicable voltage ratings. These are VMAX Operating and VMAX Interrupt.
To help understand the nature of these two different voltage ratings, the following definitions are provided:
VMAX Operating : For telecommunications devices, this is the voltage used to obtain component recognition under UL1434. Most circuit protection
devices are certified at 60V but can withstand higher VMAX Interrupt conditions.
See Table T3 for its VMAX Operating.
*VMAX Interrupt : Under specified conditions, this is the highest voltage that can be applied to the device at the maximum current. Devices may trip
safely under higher power level cross conditions, as listed above, to assist equipment in meeting the appropriate industry conditions.
Table T1 — Product Series: Size, Current Rating, Voltage Rating, Typical Resistance
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Part
Number**
Maximum Ambient Temperature
-40°C -20°C 0°C 20°C 40°C 50°C 60°C 70°C 85°C
Chip* — 250VAC
TCF250
TCF250-100T 0.155 0.138 0.119 0.100 0.083 0.073 0.064 0.055 0.042
TCF250-120 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TCF250-120T 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TCF250-145 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
TCF250-145T 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
TCF250-180T 0.269 0.240 0.211 0.180 0.153 0.138 0.123 0.109 0.087
Radial-leaded* — 250VAC
TRF250
TRF250-055T 0.085 0.076 0.065 0.055 0.045 0.041 0.035 0.030 0.023
TRF250-055UT 0.085 0.076 0.065 0.055 0.045 0.041 0.035 0.030 0.023
TRF250-080T 0.124 0.110 0.095 0.080 0.066 0.059 0.051 0.044 0.033
TRF250-080U 0.124 0.110 0.095 0.080 0.066 0.059 0.051 0.044 0.033
TRF250-110U 0.171 0.151 0.131 0.110 0.091 0.081 0.071 0.061 0.046
TRF250-120 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TRF250-120T 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TRF250-120U 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TRF250-120UT 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TRF250-145 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
TRF250-145T 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
TRF250-145U 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
TRF250-180 0.279 0.247 0.213 0.180 0.147 0.131 0.115 0.099 0.074
TRF250-183‡0.284 0.251 0.217 0.183 0.149 0.133 0.117 0.101 0.075
TRF250-183U‡0.284 0.251 0.217 0.183 0.149 0.133 0.117 0.101 0.075
TRF250-184‡0.286 0.252 0.218 0.184 0.150 0.134 0.118 0.102 0.075
Surface-mount* — 250VAC
TS250/TSL250/TSV250
TSL250-080F 0.124 0.110 0.095 0.080 0.066 0.059 0.051 0.044 0.033
TSL250-130F 0.208 0.182 0.156 0.130 0.104 0.091 0.078 0.065 0.045
TS250-130F 0.208 0.182 0.156 0.130 0.104 0.091 0.078 0.065 0.045
TSV250-130F 0.208 0.182 0.156 0.130 0.104 0.091 0.078 0.065 0.045
TSV250-184F 0.286 0.252 0.218 0.184 0.150 0.134 0.118 0.102 0.075
Radial-leaded† — 600VAC
TRF600
TRF600-150 0.239 0.209 0.180 0.150 0.121 0.107 0.093 0.079 0.057
TR600-150F-EX 0.239 0.209 0.180 0.150 0.121 0.107 0.093 0.079 0.057
TRF600-160 0.255 0.223 0.192 0.160 0.129 0.114 0.099 0.084 0.061
TRF600-250 0.400 0.350 0.300 0.250 0.198 0.170 0.140 0.117 0.083
TRF600-400 0.640 0.560 0.480 0.400 0.320 0.270 0.230 0.190 0.130
Surface-mount† — 600VAC
TS600/TSM600
TS600-170F 0.264 0.230 0.200 0.170 0.140 0.125 0.109 0.094 0.070
TS600-200F 0.310 0.275 0.238 0.200 0.165 0.147 0.128 0.110 0.083
TS600-400F 0.640 0.560 0.480 0.400 0.320 0.270 0.230 0.190 0.130
TSM600-250F 0.400 0.350 0.300 0.250 0.198 0.170 0.140 0.117 0.083
TSM600-400F 0.640 0.560 0.480 0.400 0.320 0.270 0.230 0.190 0.130
* 250VAC interrupt products may help equipment pass ITU K.20, K.21 and K.45 recommendations and Telcordia GR-1089 Port Type 2 and 4 requirements.
** Applies to all products which share the same prefix.
† 600VAC interrupt products may help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
‡ Product is not currently available in a resistance matched or sorted option.
Table T2 — Thermal Derating [Hold Current (A) at Ambient Temperature (°C)]
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Figure T1 — Thermal Derating Curve
Figure T1
A = TCF250-180T
B = All other TCF, TRF,
TSM Series Devices
% of Rated Hold and Trip Current
Device’s Ambient Temperature (˚C)
200
150
100
50
0-40 -20 020406
08
0
A
A
B
B
* 250VAC interrupt products may help equipment pass ITU K.20, K.21 and K.45 recommendations and Telcordia GR-1089 Port Type 2 and 4 requirements.
† 600VAC interrupt products may help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
‡ Product is not currently available in a resistance matched or sorted option
Table T3 — Electrical Characteristics
Part
Number
VMAX IMAX*†
IHITOperating Interrupt Interrupt PD Typ Typical Time-to-trip RMIN RMAX R1MAX
(A) (A) (VDC)(VRMS)(A) (W) (A) (s) (Ω) (Ω) (Ω)
Chip* — 250VAC
TCF250
TCF250-100T-RB 0.090 0.150 60 250 3.0 0.6 1.0 0.2 15.4 18.0 24.0
TCF250-120 0.120 0.240 60 250 3.0 0.8 1.0 0.9 5.0 9.0 14.0
TCF250-120T 0.120 0.240 60 250 3.0 0.8 1. 0 0.6 6.3 12.0 18.0
TCF250-145 0.145 0.290 60 250 3.0 1. 0 1. 0 2.5 3.0 6.0 14.0
TCF250-145T 0.145 0.290 60 250 3.0 1. 0 1. 0 1. 0 5.0 9.0 14.0
TCF250-180T‡0.180 0.380 60 250 3.0 0.8 1. 0 3.4 1. 9 3.0 4.2
Radial-leaded* — 250VAC
TRF250
TRF250-055T 0.055 0.170 60 250 3.0 0.6 0.28 3.5 15.0 25.0 35.0
TRF250-055UT 0.055 0.170 60 250 3.0 0.6 0.28 3.0 15.0 25.0 35.0
TRF250-080T 0.080 0.160 60 250 3.0 0.6 0.35 4.0 15.0 22.0 33.0
TRF250-080U 0.080 0.160 60 250 3.0 0.6 0.35 2.5 14.0 20.0 33.0
TRF250-110U 0.110 0.220 60 250 3.0 0.6 1.00 0.8 5.0 9.0 16.0
TRF250-120 0.120 0.240 60 250 3.0 0.8 1. 0 0 1. 5 4.0 8.0 16.0
TRF250-120T 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.7 7. 0 12.0 16.0
TRF250-120T-RA 0.120 0.240 60 250 3.0 0.8 1. 0 0 1. 2 7. 0 9.0 16.0
TRF250-120T-RC 0.130 0.260 60 250 3.0 0.8 1. 0 0 3.0 5.4 7. 5 14.0
TRF250-120T-RF 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.9 6.0 10.5 16.0
TRF250-120T-RH 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.7 9.0 11. 0 16.0
TRF250-120T-R1 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.7 6.0 9.0 16.0
TRF250-120T-R2 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.8 8.0 10.5 16.0
TRF250-120U 0.120 0.240 60 250 3.0 0.7 1. 0 0 1. 0 6.0 10.0 16.0
TRF250-120UT 0.120 0.240 60 250 3.0 0.7 1. 0 0 0.7 7. 0 12.0 16.0
TRF250-145 0.145 0.290 60 250 3.0 0.8 1. 0 0 2.5 3.0 6.0 14.0
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Part
Number
VMAX IMAX*†
IHITOperating Interrupt Interrupt PD Typ Typical Time-to-trip RMIN RMAX R1MAX
(A) (A) (VDC)(VRMS)(A) (W) (A) (s) (Ω) (Ω) (Ω)
Radial-leaded* — 250VAC
TRF250
TRF250-145-RA 0.145 0.290 60 250 3.0 0.8 1. 0 0 2.5 3.0 6.0 12.0
TRF250-145T 0.145 0.290 60 250 3.0 0.8 1. 0 0 1. 5 5.4 7. 5 14.0
TRF250-145U 0.145 0.290 60 250 3.0 0.7 1. 0 0 2.0 3.5 6.5 14.0
TRF250-180 0.180 0.650 100 250 10.0 0.9 3.00 0.5 0.8 2.2 4.0
TRF250-183‡0.183 0.685 100 250 10.0 0.9 3.00 0.6 0.8 2.0 3.4
TRF250-183U‡0.183 0.685 100 250 10.0 0.9 3.00 0.6 0.8 2.0 3.4
TRF250-184‡0.184 1.000 100 250 10.0 0.9 3.00 0.5 1. 2 2.4 3.1
Surface-mount* — 250VAC
TS250/TSL250/TSV250
TSL250-080F 0.080 0.240 80 250 3.0 1. 2 1. 0 0.8 5.0 11. 0 20.0**
TSL250-130F 0.130 0.260 60 250 3.0 1. 5 1. 0 2.0 4.0 8.0 12.0**
TS250-130F 0.130 0.260 60 250 3.0 1. 1 1. 0 0.9 6.5 12.0 20.0**
— — 60 600 1. 0 — — — — — —
TS250-130F-RA 0.130 0.260 60 250 3.0 1. 1 1. 0 1. 4 6.5 9.0 15.0**
— — 60 600 1. 0 — — — — — —
TS250-130F-RB 0.130 0.260 60 250 3.0 1. 1 1. 0 0.7 9.0 12.0 20.0**
— — 60 600 1. 0 — — — — — —
TS250-130F-RC 0.130 0.260 60 250 3.0 1. 1 1. 0 1. 1 7. 0 10.0 17.0**
— — 60 600 1. 0 — — — — — —
TSV250-130F 0.130 0.260 60 250 3.0 1. 5 1. 0 2.0 4.0 7. 0 12.0**
TSV250-184F 0.184 0.690 100 250 10.0 0.9 3.0 0.5 1. 2 3.0 4.0**
Radial-leaded† — 600VAC
TRF600
TRF600-150 0.150 0.300 250 600 3.0 1. 4 1. 0 1. 4 6.0 10.0 1 7. 0
TRF600-150-RB 0.150 0.300 250 600 3.0 1. 4 1. 0 1. 0 9.0 12.0 22.0
TRF600-150-R2 0.150 0.300 250 600 3.0 1. 4 1. 0 1. 3 7. 0 10.0 1 7. 0
TR600-150F-EX 0.150 0.300 250 600 3.0 1.4 1.0 5.0 6.0 12.0 22.0
TR600-150F-EX-RB 0.150 0.300 250 600 3.0 1.4 1.0 5.0 9.0 12.0 22.0
TRF600-160 0.160 0.320 250 600 3.0 1. 7 1. 0 7. 5 4.0 10.0 18.0
TRF600-160-RA 0.160 0.320 250 600 3.0 1. 7 1. 0 9.5 4.0 7. 0 16.0
TRF600-250 0.250 0.850 250 600 3.0 2.0 3.0 1.0 1. 0 4.3 7. 0
TRF600-400 0.400 1.000 60 600 3.0 2.4 3.0 4.0 0.95 1.45 1.90
Surface-mount† — 600VAC
TS600/TSM600
TS600-170F 0.170 0.400 60 600 3.0 2.5 1. 0 10.0 4.0 9.0 18.0
TS600-200F-RA-B-0.5 0.200 0.400 60 600 3.0 2.5 1. 0 12.0 4.0 7. 5 13.5
TS600-400F 0.400 1.000 60 600 3.0 2.0 3.0 5.0 0.5 1. 1 2.0
TSM600-250F 0.250 0.860 250 600 3.0 2.0 3.0 0.8 1. 0 3.5 7. 0
TSM600-250F-RA 0.250 0.860 250 600 3.0 2.0 3.0 1. 0 1. 0 3.0 5.0
TSM600-400F 0.400 1.000 250 600 3.0 2.0 3.0 5.0 0.5 1. 1 2.0
Notes:
IH : Hold current: maximum current device will pass without interruption in 20°C still air.
IT : Trip current: minimum current that will switch the device from low resistance to high resistance in 20°C still air.
VMAX Operating : Maximum continuous voltage device can withstand without damage at rated current. This voltage is used for component recognition under UL1434.
VMAX Interrupt : Maximum voltage that can be safely placed across a device in its tripped state. Devices may trip safely under higher level power cross conditions to assist equipment in meeting
IMAX Interrupt : Maximum fault current device can withstand without damage at rated operating voltage. This current is used for component recognition under UL1434.
Devices may trip safely under higher level power cross conditions to assist equipment in meeting the appropriate ITU, UL60950 or GR1089 industry requirements.
PD : Power dissipated from device when in the tripped state in 20°C still air.
RMIN : Minimum resistance of device as supplied at 20°C unless otherwise specified.
RMAX : Maximum resistance of device as supplied at 20°C unless otherwise specified.
R1MAX : Maximum resistance measured one hour post-trip or post-reflow at 20°C.
* 250VAC interrupt products may help equipment pass ITU K.20, K.21 and K.45 recommendations and Telcordia GR-1089 Port Type 2 and 4 requirements.
† 600VAC interrupt products may help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
‡ Product is not currently available in a resistance matched or sorted option.
** R1MAX measured 1 hour post-trip or 24 hours post-reflow at 20°C.
Table T3 — Electrical Characteristics (Cont’d)
RoHS
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2018 Littelfuse, Inc. 240
PolySwitch Resettable Devices
Telecommunications and Networking Devices
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A
A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A
A
A
C
C
C
C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
Figures T2-T12 — Dimension Figures
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
Figure T2
Figure T5
Figure T8
Figure T10
Figure T3
Figure T6
Figure T9
Figure T11
Figure T4
Figure T7
Figure T12
RoHS
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2018 Littelfuse, Inc.
241
PolySwitch Resettable Devices
Telecommunications and Networking Devices
Part
Number**
Dimensions in Millimeters (Inches)
Figure
Device Mass (g)
(Only for Reference)
A B C D E F G
Min Max Min Max Min Max Min Max Min Max Min Max Min Max
TCF-250V*
TCF250-100T 4.6 4.9 4.6 4.9 2.0 2.3 — — — — — — — — T4 0.24
(0.18) (0.19) (0.18) (0.19) (0.08) (0.09)
TCF250-120 5.4 5.6 5.4 5.6 2.0 2.3 — — — — — — — — T4 0.28
(0.21) (0.22) (0.21) (0.22) (0.08) (0.09)
TCF250-120T 5.4 5.6 5.4 5.6 2.0 2.3 — — — — — — — — T4 0.28
(0.21) (0.22) (0.21) (0.22) (0.08) (0.09)
TCF250-145 5.4 5.6 5.4 5.6 2.0 2.5 — — — — — — — — T4 0.28
(0.21) (0.22) (0.21) (0.22) (0.08) (0.10)
TCF250-145T 5.4 5.6 5.4 5.6 2.0 2.5 — — — — — — — — T4 0.28
(0.21) (0.22) (0.21) (0.22) (0.08) (0.10)
TCF250-180T 6.9 7. 1 6.9 7. 1 1. 3 1. 6 — — — — — — — — T4 0.35
(0.27) (0.28) (0.27) (0.28) (0.05) (0.06)
TRF250-250V*
TRF250-055T — 5.8 — 9.9 — 4.6 4.7 — 5.0‡T2 0.28
(0.23) (0.39) (0.18) (0.19) (0.20)
TRF250-055UT — 4.8 — 9.3 — 3.8 4.7 — 5.0‡ — — — — — T11 0.13
(0.19) (0.37) (0.15) (0.19) (0.20)
TRF250-080T — 5.8 — 9.9 — 4.6 4.7 — 5.0‡— — — — — T2 0.28
(0.23) (0.39) (0.18) (0.19) (0.20)
TRF250-080U — 4.8 — 9.3 — 3.8 4.7 — 5.0‡— — — — — T 11 0.13
(0.19) (0.37) (0.15) (0.19) (0.20)
TRF250-110U — 5.3 — 9.4 — 3.8 4.7 — 5.0‡ — — — — — T11 0.13
(0.21) (0.37) (0.15) (0.19) (0.20)
TRF250-120 — 6.5 — 11. 0 — 4.6 4.7 — 5.0‡— — — — — T3 0.38
(0.26) (0.43) (0.18) (0.19) (0.20)
TRF250-120T — 6.5 — 11. 0 — 4.6 4.7 — 5.0‡7. 0 T3 0.38
(0.26) (0.43) (0.18) (0.19) (0.20) (0.28)
TRF250-120U — 6.0 — 10.0 — 3.8 4.7 — 5.0‡— — 6.0 — — T10 0.19
(0.24) (0.39) (0.15) (0.19) (0.20) (0.24)
TRF250-120UT — 6.0 — 10.0 — 3.8 4.7 — 5.0‡— — 6.0 — — T10 0.19
(0.24) (0.39) (0.15) (0.19) (0.20) (0.24)
TRF250-145 — 6.5 — 11. 0 — 4.6 4.7 — 5.0‡— — 7. 0 — — T3 0.38
(0.26) (0.43) (0.18) (0.19) (0.20) (0.28)
TRF250-145T 6.5 — 11. 0 — 4.6 4.7 — 5.0‡— — 7. 0 — — T3 0.38
(0.26) (0.43) (0.18) (0.19) (0.20) (0.28)
TRF250-145U — 6.0 — 10.0 — 3.8 4.7 — 5.0‡— — 6.0 — — T10 0.19
(0.24) (0.39) (0.15) (0.19) (0.20) (0.24)
TRF250-180 — 9.0 — 12.0 — 3.8 4.7 — 5.0‡— — — — — T2 0.35
(0.35) (0.47) (0.15) (0.19) (0.20)
TRF250-183 — 7.5 — 10.5 — 3.8 4.7 — 5.0‡— — — — — T2 0.30
(0.29) (0.41) (0.15) (0.19) (0.20)
TRF250-183U 6.5 10.0 3.0 4.7 5.0‡T11 0.16
(0.26) (0.39) (0.12) (0.19) (0.20)
TRF250-184 — 7.7 — 10.5 — 4.6 4.7 — 5.0‡— — — — — T2 0.32
(0.30) (0.41) (0.18) (0.19) (0.20)
TS250/TSL250/TSV250-250V*
TSL250-080F 6.7 7. 9 2.7 3.7 4.8 5.3 0.2 0.4 2.5 3.1 — — — — T7 2.80
(0.27) (0.31) (0.11) (0.15) (0.19) (0.21) (0.01) (0.02) (0.10) (0.12)
TSL250-130F 6.7 7. 9 2.7 3.7 4.8 5.3 0.2 0.4 2.5 3.1 — — — — T7 2.80
(0.27) (0.31) (0.11) (0.15) (0.19) (0.21) (0.01) (0.02) (0.10) (0.12)
Table T4 — Dimensions & Weights
RoHS
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2018 Littelfuse, Inc. 242
PolySwitch Resettable Devices
Telecommunications and Networking Devices
* 250VAC interrupt products may help equipment pass ITU K.20, K.21 and K.45 recommendations and Telcordia GR-1089 Port Type 2 and 4 requirements.
** Applies to all products which share the same prefix.
† 600VAC interrupt products may help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
‡ Indicates dimension is typical, not minimum.
Figure T13
TCF250
A = TCF250-180T
B = TCF250-145/145T
C = TCF250-120/120T
D = TCF250-100T
Time–to–Trip (s)
Fault Current (A)
100
10
1
0.10
0.01
0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 2.60 2.80 3.00
A
A
B
B
C
D
C
D
Figures T13-T16 —
Typical Time-to-Trip Curves
at 20°C
Table T4 — Dimensions & Weights (Cont’d)
Part
Number**
Dimensions in Millimeters (Inches)
Figure
Device Mass (g)
(Only for Reference)
A B C D E F G
Min Max Min Max Min Max Min Max Min Max Min Max Min Max
TS250-130F 8.5 9.4 — 3.4 — 7. 4 0.3‡— 3.8‡— — — — — T5 3.60
(0.34) (0.37) (0.14) (0.29) (0.01) (0.15)
TS250/TSL250/TSV250-250V*
TSV250-130F — 6.10 — 6.90 — 3.20 0.56 — — 1.90 1.60 2.30 — — T6 2.80
(0.24) (0.27) (0.13) (0.02) (0.08) (0.07) (0.09)
TSV250-184F — 6.10 — 6.90 — 3.20 0.56 — — 1.90 1.60 2.30 — — T6 2.80
(0.24) (0.27) (0.13) (0.02) (0.08) (0.07) (0.09)
TRF600-600V†
TRF600-150 — 9.0 — 12.5 — 4.6 4.7 — 5.0 — — 9.0 — — T3 0.37
(0.35) (0.49) (0.18) (0.19) (0.20) (0.35)
TR600-150F-EX — 13.5 — 12.6 — 6.0 4.7 — 5.0 — — — — — T12 0.80
(0.53) (0.50) (0.18) (0.19) (0.20)
TRF600-160 — 16.0 — 12.6 — 6.0 4.7 — 5.0‡— — 10.0 — — T13 0.90
(0.63) (0.50) (0.24) (0.19) (0.20) (0.39)
TRF600-250 — 15.0 14.5 4.6 4.7 5.0‡ — 10.0 — T3 0.87
(0.59) (0.57) (0.18) (0.19) (0.20) (0.39)
TRF600-400 — 14.8 — 13.1 — 4.6 6.0 — 5.0‡— — — — — T12 0.85
(0.58) (0.52) (0.18) (0.27) (0.20)
TS600/TSM600-600V†
TS600-170F 18.3 19.4 11. 6 12.3 7. 2 8.3 1. 7 2.4 9.9 10.4 1. 5 2.3 — — T8 23.6
(0.72) (0.77) (0.46) (0.49) (0.29) (0.33) (0.07) (0.10) (0.39) (0.41) (0.06) (0.09)
TS600-200F 18.3 19.4 11. 6 12.3 7. 2 8.3 1. 7 2.4 9.9 10.4 1. 5 2.3 — — T8 23.6
(0.72) (0.77) (0.46) (0.49) (0.29) (0.33) (0.07) (0.10) (0.39) (0.41) (0.06) (0.09)
TS600-400F 18.3 19.4 11. 6 12.3 7. 2 8.3 1. 7 2.4 9.9 10.4 1. 5 2.3 — — T8 19.8
(0.72) (0.77) (0.46) (0.49) (0.29) (0.33) (0.07) (0.10) (0.39) (0.41) (0.06) (0.09)
TSM600-250F 1 7. 0 17.60 11.20 11.70 10.40 11.20 4.80 5.20 2.50 2.80 0.60 1. 0 2.2 3.1 T9 31.2
(0.67) (0.69) (0.44) (0.46) (0.41) (0.44) (0.19) (0.20) (0.10) (0.11) (0.02) (0.04) (0.09) (0.12)
TSM600-400F 1 7. 0 17.60 11.20 11.70 10.40 11.20 4.80 5.20 2.50 2.80 0.60 1. 0 2.2 3.1 T9 31.2
(0.67) (0.69) (0.44) (0.46) (0.41) (0.44) (0.19) (0.20) (0.10) (0.11) (0.02) (0.04) (0.09) (0.12)
RoHS
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2018 Littelfuse, Inc.
243
PolySwitch Resettable Devices
Telecommunications and Networking Devices
Figure T14
Figure T15
Figure T16
TRF250
A = TRF250-180/183/183U/184
B = TRF250-145/145U/145T
C = TRF250-120/120U
D = TRF250-110U/120UT/120T
E = TRF250-080T/080U
F = TRF250-055T/055UT
TRF600/TS600/TSM600
A = TRF600-400/TS600-400/
TSM600-400F
B = TRF600-250/TSM600-250F/
TS600-170F/200F
C = TRF600-160
D = TR600-150F-EX
E = TRF600-150
TS250/TSV250/TSL250
A = TSV250-184F
B = TSV250-130F/TSL250-130F
C = TS250-130F
D = TSL250-080F
Figures T13-T16 — Typical Time-to-Trip Curves at 20°C (Cont’d)
0.00 0.50 1.00 1.50 2.00 2.50 3.00
Time–to–Trip (s)
Fault Current (A)
B
C
D
A
B
DA
C
Time–to–Trip (s)
Fault Current (A)
1000
100
10
1
0.1
0.01
012345
67
E
C
B
A
D
E
A
B
C
D
Time–to–Trip (s)
Fault Current (A)
1000
100
10
1
0.1
0.01
0.00 0.20 0.40 0.60 0.80 1. 00 1. 20 1. 40 1. 60 1. 80 2.00 2.20 2.40 2.60 2.80 3.00
A
B
C
D
E
F
A
B
C
D
E
F
RoHS
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
TCF250*
Physical Characteristics
Terminal Material Nickel-plated Copper Foil
Environmental Specifications
Test Conditions
Passive Aging 60°C, 1000 hrs
85°C, 1000 hrs
Humidity Aging 85°C, 85% RH, 1000 hrs
Thermal Shock 125°C, -55°C (10 Times)
Solvent Resistance MIL-STD-202, Method 215F
Note: Storage conditions: 40°C (max), 70% RH (max), devices should remain in original sealed bag prior to use. Devices may not meet specified values if these storage conditions are exceeded.
TRF250*
Physical Characteristics
Lead Material Tin-plated Copper, 22AWG
Insulating Material Cured Epoxy Polymer
Flammability Per IEC 695-2-2 Needle Flame Test for 20 s
Soldering Characteristics ANSI/J-STD-002, Category 3
Solder Heat Withstand IEC-STD 68-2-20, Test Tb, Section 5 Method 1A, Condition B: Can Withstand 10s at 260°C±5°C
Note: Devices are not intended to be placed through a reflow process.
Environmental Specifications
Test Conditions
Passive Aging 60°C, 1000 hrs
85°C, 1000 hrs
Humidity Aging 85°C, 85% RH, 1000 hrs
Thermal Shock 125°C, -55°C (10 Times)
Solvent Resistance MIL-STD-202, Method 215F
Note: Storage conditions: 40°C (max), 70% RH (max), devices should remain in original sealed bag prior to use. Devices may not meet specified values if these storage conditions are exceeded.
TS250/TSV250/TSL250*
Physical Characteristics
Terminal Material Tin-plated Brass, Nickel Under-plating
Soldering Characteristics EIC 60068-2-58
Environmental Specifications
Test Conditions
Passive Aging 60°C, 1000 hrs
85°C, 1000 hrs
Humidity Aging 85°C, 85% RH, 500 hrs
Thermal Shock 125°C, -55°C (10 Times)
Solvent Resistance MIL-STD-202, Method 215F
Note: Storage conditions: 40°C (max), 70% RH (max), devices should remain in original sealed bag prior to use. Devices may not meet specified values if these storage conditions are exceeded.
Table T5 — Physical Characteristics and Environmental Specifications
Operating temperature range for all listed products is -40°C to 85°C, except for TRF250-080T and TRF250-184 (0°C t 85°C)
RoHS
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Table T5 — Physical Characteristics and Environmental Specifications (Cont’d)
Operating temperature range for all listed products is -40°C to 85°C, except for TRF250-080T and TRF250-184 (0°C to 85°C)
TRF600†
Physical Characteristics
Lead Material Tin-plated Copper, 22AWG
Insulating Material Cured Epoxy Polymer‡
Flammability Per IEC 695-2-2 Needle Flame Test for 20s
Soldering Characteristics ANSI/J-STD-002, Category 3
Solder Heat Withstand IEC-STD 68-2-20, Test Tb, Section 5 Method 1A, Condition B: Can Withstand 10 s at 260°C±5°C
Note: Devices are not intended to be placed through a reflow process.
Environmental Specifications
Test Conditions
Passive Aging 60°C, 1000 hrs
85°C, 1000 hrs
Humidity Aging 85°C, 85% RH, 1000 hrs‡
Thermal Shock 125°C, -55°C (10 Times)
Solvent Resistance MIL-STD-202, Method 215F
Note: Storage conditions: 40°C (max), 70% RH (max) devices should remain in original sealed bag prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
TS600†
Physical Characteristics
Terminal Material Tin-plated Brass
Insulating Material Nylon Resin (UL94V-0), 1000V Dielectric Rating
Flammability IEC 695-2-2 Needle Flame Test for 20 s
Soldering Characteristics ANSI/J-STD-002, Category 3
Solder Heat Withstand IEC-STD 68-2-20, Test Tb, Section 5 Method 1A
Environmental Specifications
Test Conditions
Passive Aging 60°C, 1000 hrs
85°C, 1000 hrs
Humidity Aging 85°C, 85% RH, 1000 hrs
Thermal Shock 125°C, -55°C (10 Times)
Solvent Resistance MIL-STD-202, Method 215F
Note: Storage conditions: 40°C (max), 70% RH (max), devices should remain in original sealed bag prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
* 250VAC interrupt products may help equipment pass ITU K.20, K.21 and K.45 recommendations and Telcordia GR-1089 Port Type 2 and 4 requirements.
† 600VAC interrupt products may help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
‡ Excluding TRF600-150 and TRF600-400, which have a coating that is not rated for dielectric withstand and can withstand 500h at 85°C/85% RH or 1000h at 60°C/90% RH.
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Table T5 — Physical Characteristics and Environmental Specifications (Cont’d)
Operating temperature range for all listed products is -40°C to 85°C, except for TRF250-080T and TRF250-184 (0°C to 85°C)
TSM600†
Physical Characteristics
Terminal Material Tin-plated Brass
Insulating Material Nylon Resin (UL94V-0), 1000V Dielectric Rating
Flammability IEC 695-2-2 Needle Flame Test for 20 s
Soldering Characteristics EIC60068-2-58, Method 7
Solder Heat Withstand IEC-STD 68-2-20, Test Tb, Section 5 Method 1A
Environmental Specifications
Test Conditions
Passive Aging 60°C, 1000 hrs
85°C, 1000 hrs
Humidity Aging 85°C, 85% RH, 1000 hrs
Storage Humidity Per IPC/JEDEC J-STD-020A Level 2a
Thermal Shock 125°C, -55°C (10 Times)
Solvent Resistance MIL-STD-202, Method 215J
Note: Storage conditions: 40°C (max), 70% RH (max) devices should remain in original sealed bag prior to use. Devices may not meet specified values if these storage conditions
are exceeded.
† 600VAC interrupt products may help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
Table T6 — Packaging and Marking Information
Part
Number**
Bag
Quantity
Tape and Reel
Quantity
Standard Package
Quantity Part Marking Agency Recognition
Chip* — 250VAC
TCF250
TCF250-100T 2,500 —10,000 — —
TCF250-120 2,500 —10,000 — —
TCF250-120T 2,500 —10,000 — —
TCF250-145 2,500 —10,000 —UL
TCF250-145T 2,500 —10,000 —UL
TCF250-180T 2,500 —10,000 —UL
Radial-leaded* — 250VAC
TRF250
TRF250-055T 500 —10,000 — —
TRF250-055UT 500 —10,000 — —
TRF250-080U 500 —10,000 —UL, CSA, TÜV
TRF250-080T 500 —10,000 08F UL, CSA, TÜV
TRF250-110U 500 —10,000 —UL, CSA, TÜV
TRF250-120 500 —10,000 20F UL, CSA, TÜV
TRF250-120-2 —1,500 7,500 20F UL, CSA, TÜV
TRF250-120T 500 —10,000 20F UL, CSA, TÜV
TRF250-120T-2 —1,500 7,500 20F UL, CSA, TÜV
TRF250-120U 500 —10,000 20F UL, CSA, TÜV
TRF250-120U-2 —1,500 7,500 20F UL, CSA, TÜV
TRF250-120UT 500 —10,000 20F UL, CSA, TÜV
RoHS
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Part
Number**
Bag
Quantity
Tape and Reel
Quantity
Standard Package
Quantity Part Marking Agency Recognition
Radial-leaded* — 250VAC
TRF250
TRF250-145 500 —10,000 45F UL, CSA, TÜV
TRF250-145-2 —1,500 7,500 45F UL, CSA, TÜV
TRF250-145T 500 —10,000 45F UL, CSA, TÜV
TRF250-145T-2 —1,500 7,500 45F UL, CSA, TÜV
TRF250-145U 500 —10,000 45F UL, CSA, TÜV
TRF250-145U-2 —1,500 7,500 45F UL, CSA, TÜV
TRF250-180 500 —10,000 80F UL, CSA, TÜV
TRF250-180-2 —1500 7,500 80F UL, CSA, TÜV
TRF250-183 500 —10,000 83F UL, CSA, TÜV
TRF250-183-2 —1,500 7,500 83F UL, CSA, TÜV
TRF250-183U 500 —10,000 —UL, CSA, TÜV
TRF250-184 500 —10,000 84F UL, CSA, TÜV
Surface-mount* — 250VAC
TS250/TSL250/TSV250
TSL250-080F-2 —1,500 7,500 T08 UL, CSA,TÜV
TSL250-130F-2 —1,500 7,500 T13 —
TS250-130F-2 —1,500 7,500 T13 UL, CSA, TÜV
TSV250-130F 2500 —10,000 T13V UL, CSA, TÜV
TSV250-130F-2 —1,200 6,000 T13V UL, CSA, TÜV
TSV250-184F 2500 —10,000 T18V UL
Radial-leaded† — 600VAC
TRF600
TRF600-150 500 —10,000 150F UL, CSA, TÜV
TRF600-150-2 —1,500 7,500 150F UL, CSA, TÜV
TR600-150F-EX 500 —10,000 150F UL, CSA
TR600-150F-EX-2 —600 3,000 150F UL, CSA
TRF600-160 500 —10,000 160F UL, CSA, TÜV
TRF600-160-2 —600 3,000 160F UL, CSA, TÜV
TRF600-250 500 —10,000 250F UL, CSA, TÜV
TRF600-400 500 —10,000 400F UL, CSA, TÜV
Surface-mount† — 600VAC
TS600/TSM600
TS600-170F-2 —300 900 T20 UL, CSA
TS600-200F-RA-2 —300 900 T20 UL, CSA
TS600-400F-2 —300 900 T40 UL, CSA
TSM600-250F-2 —200 600 TSM600 UL, CSA
TSM600-250F-RA-2 —200 600 TSM600 UL, CSA
TSM600-400F-2 —200 600 TSM600-4 UL
Table T6 — Packaging and Marking Information (Cont’d)
Notes:
* 250VAC interrupt products are designed to help equipment pass ITU K.20, K.21 and K.45 recommendations and Telcordia GR-1089 Port Type 2 and 4 requirements.
** Applies to all products which share the same prefix.
† 600VAC interrupt products are designed to help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
Agency Recognition
UL File # E74889
CSA File # 78165C
TÜV Per IEC60730-1 Certificate # for individual products available upon request.
RoHS
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Solder Reflow
• Recommended reflow method: IR, vapor phase oven, hot air oven.
• Surface-mount devices are not intended to be wave soldered to the bottom side of the board.
• Recommended maximum paste thickness of 0.25mm (0.010in).
• Devices can be cleaned using standard industry methods and solvents.
Rework
• If a device is removed from the board, it should be discarded and replaced with a new device.
Note: All temperatures refer to topside of the package, measured on the package body surface.
Table T7 — Recommended Pad Layouts for Surface-mount PolySwitch
Telecommunications and Networking Devices in Millimeters (Inches)
Nominal
Device A B C D E F G Figure
TS250 (All) 4.60 1.80 6.10 ———— T17
(0.180) (0.070) (0.240) ————
TSV250 (All) 2.29 2.41 6.35 3.43 ——— T18
(0.090) (0.095) (0.250) (0.135) ———
TSL250 (All) 3.60 1.80 5.50 ———— T17
(0.140) (0.070) (0.220) ————
TS600 (All) 10.42 3.30 3.35 ———— T17
(0.410) (0.130) (0.132) ————
TSM600 (All) 5.20 17.80 5.54 6.75 2.08 3.12 8.39 T19
(0.205) (0.701) (0.218) (0.266) (0.082) (0.123) (0.331)
FigureT17 Figure T18 Figure T19
A
A
A
A
B B
B
C
C D
G
E
F
D
B
CB
A
A
A
A
B B
B
C
C D
G
E
F
D
BCB
A
A
A
A
B B
B
C
C D
G
E
F
D
BCB
Profile Feature Pb-Free Assembly
Average ramp up rate (TsMAX to Tp) 3°C/s max
Preheat
• Temperature min (TsMIN) 150°C
• Temperature max (TsMAX) 200°C
• Time (tsMIN to tsMAX) 60-180 s
Time maintained above:
• Temperature (TL) 217°C
• Time (tL) 60-150 s
Peak/Classification temperature (Tp) 260°C
Time within 5°C of actual peak temperature
Time (tp) 20-40 s
Ramp down rate 6°C/s max
Time 25°C to peak temperature 8min max
Solder Reflow and Rework Recommendations for PolySwitch Telecommunications
Surface-Mount Devices
Figure T20
RoHS
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Table T8 — TRF250/TRF600 Tape and Reel Specifications
TRF250/TRF600 devices are available in tape and reel packaging per EIA 468-B standard.
Dimension
Description EIA Mark IEC Mark Dimension (mm) Tolerance
Carrier Tape Width W W 18 -0.5/+1.0
Hold Down Tape Width W4W05Min
Top Distance between Tape Edges W6W23Max
Sprocket Hole Position W5W19-0.5/+0.75
Sprocket Hole Diameter D0D04±0.2
Abcissa to Plane (Straight Lead) H H 18.5 ±3.0
Abcissa to Plane (Kinked Lead)* H0H016 -0.5/+0.6
Abcissa to Top H1H138.5 Max
Overall Width with Lead Protrusion — C143.2 Max
Overall Width without Lead Protrusion — C242.5 Max
Lead Protrusion L1I11. 0 Max
Protrusion of Cut-out L L 11 Max
Protrusion beyond Hold Down Tape I2I2Not Specified —
Sprocket Hole Pitch P0P012.7 ±0.3
Device Pitch (TRF250 and TRF600-150) — — 12.7 —
Device Pitch (TRF600-160 - TRF600-400) — — 25.4 —
Pitch Tolerance — — 20 Consecutive ±1
Tape Thickness t t 0.9 Max
Tape Thickness with Splice* t1—2.0 Max
Splice Sprocket Hole Alignment — — 0 ±0.3
Body Lateral Deviation DhDh 0 ±1.0
Body Tape Plane Deviation DpDp 0 ±1.3
Lead Spacing Plane Deviation DP1P10±0.7
Lead Spacing* F F 5.08 ±0.6
Reel Width w2w56 Max
Reel Diameter a d 370 Max
Space between Flanges Less Device w1—4.75 ±3.25
Arbor Hole Diameter c f 26 ±12.0
Core Diameter n h 80 Max
Box — — 56/372/372 Max
Consecutive Missing Pieces* — — 3 Max —
Empty Places per Reel* — — Not Specified —
* Differs from EIA specification.
Recommended Wave Soldering
• Soldering temperature profile
Temperature characteristic at component terminal with dual
wave soldering
Rework
• If a device is removed from the board, it should be discarded
and replaced with a new device
Wave Soldering and Rework Recommendations for PolySwitch Telecommunications
Radial-Leaded Devices
Figure T21
300
250
200
150
100
50
0050
10s
245˚C ... 260˚C
100˚C ... 130˚C
Forced cooling
100 150 200 250
Temperature (˚C)
Time (s)
RoHS
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Figure T22 — EIA Referenced Taped Component Dimensions for PolySwitch
Telecommunications Radial-Leaded Devices
Figure T23 — Reel Dimensions for PolySwitch Telecommunications
Radial-Leaded Devices
w1
n
a
c
w2
Cross Section
Direction of
Unreeling
Reel
Tape
Upper Side
Lower Side
Optional Shape: Circular or Polygonal
h
H1P1
W4
H0
H1
C1
C2
F
AB
Reference Plane
Direction of Unreeling
Cross section A-B
W5
H
W
t
P0D0
I2
L
L1
hpp
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RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2018 Littelfuse, Inc.
251
PolySwitch Resettable Devices
Telecommunications and Networking Devices
TS250/TSL250/TSV250
Dimension
Description
TS250 TSV250 TSL250
EIA Mark Dimension (mm) Tolerance (mm) Dimension (mm) Tolerance (mm) Dimension (mm) Tolerance (mm)
Carrier Tape Width W16 ±0.30 16.0 ±0.30 16 ±0.30
Sprocket Hole Pitch P04.0 ±0.10 4.0 ±0.10 4.0 ±0.10
P112.0 ±0.10 8.0 ±0.10 8.0 ±0.10
P22.0 ±0.10 2.0 ±0.10 2.0 ±0.10
A06.9 ±0.23 5.5 ±0.10 5.5 ±0.10
B09.6 ±0.15 6.2 ±0.10 7. 9 ±0.10
B1 max 12.1 — 8.0 — 9.2 —
Sprocket Hole Diameter D01. 5 -0/+0.1 1.55 ±0.05 1.55 ±0.05
F7. 5 ±0.10 7. 5 ±0.10 7. 5 ±0.10
E11.75 ±0.10 1.75 ±0.10 1.75 ±0.10
E2 min 14.25 — — — — —
Tape Thickness T max 0.4 — 0.45 — 0.35 —
Tape Thickness With
Splice Cover Tape Thickness
T1 max 0.1 — 0.1 — 0.1 —
K03.4 ±0.15 7. 0 ±0.10 3.70 ±0.10
Leader min 300 — 390 — 390 —
Trailer min 300 — 160 —160 —
Reel Dimensions
Reel Diameter A max 340 — 340 — 340 —
Core Diameter N min 50 — 50 — 50 —
Space between Flanges-less Device W116.4 -0/+2.0 16.4 -0/+2.0 16.4 -0/+2.0
Reel Width W2 max 22.4 — 22.4 — 22.4 —
TS600
Dimension
Description EIA Mark Dimension (mm) Tolerance (mm)
Carrier Tape Width W 32 ±0.3
Sprocket Hole Pitch P04.0 ±0.1
P116 ±0.1
P22.0 ±0.1
A010 ±0.1
B019.2 ±0.1
B1 max 21.6
Sprocket Hole Diameter D01. 5 -0/+1.0
F 14.2 ±0.1
E11.75 ±0.1
E2 min 28.4 ±0.1
Tape Thickness T max 0.50 ±0.5
Tape Thickness with Splice T1 max 0.1
K013.2 ±0.1
Leader min 390
Trailer min 160
Reel Dimensions
Reel Diameter A max 360
Core Diameter N min 50
Space between Flanges-less Device W132.4 -0/+2.0
Reel Width W2 max 40
Table T9 — TS Tape and Reel Specifications
TS devices are packaged per EIA 481 and EIA 481-2 standards.
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Table T9 — TS Tape and Reel Specifications (Cont’d)
TS devices are packaged per EIA 481 and EIA 481-2 standards.
TSM600
Dimension
Description EIA Mark Dimension (mm) Tolerance (mm)
Carrier Tape Width W 32 ±0.3
Sprocket Hole Pitch P04.0 ±0.1
P124 ±0.1
P22.0 ±0.1
A011. 2 ±0.1
B01 7. 8 ±0.1
B1 max 23.45
Sprocket Hole Diameter D 1. 5 -0/+1.0
F 14.2 ±0.1
E11. 74 ±0.1
E2 max 28.4 ±0.1
Tape Thickness T max 0.5 ±0.5
Tape Thickness with Splice T1 max 0.1
K011. 9 ±0.1
Leader min 390
Trailer min 160
Reel Dimensions
Reel Diameter A max 360
Core Diameter N min 50
Space between Flanges-less Device W132.4 -0/+2.0
Reel Width W2 max 40
P0
E1
E2
FW
P2
D0
A0
B0
P1
B1
T1
K0
T
Cover Tape
Embossment
Center Lines
of Cavity
Figure T24 — EIA Referenced Taped Component Dimensions for PolySwitch
Telecommunications and Networking Devices
RoHS
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
Figure T25 — EIA Referenced Reel Dimensions for PolySwitch
Telecommunications and Networking Devices
A
Cover Tape
Embossed Cavity
Carrier Tape
N (Hub Dia.)
W2 (Measured at Hub)
W1 (Measured at Hub)
PolySwitch Telecommunications and Networking Resistance-Sorted and
Resistance-Matched Devices
Most TCF, TRF and TS devices are available in resistance-sorted and/or resistance-matched versions.
Resistance-sorted Devices
Resistance-sorted devices (part number suffix “Rx”, where x = 1, 2, A, B, C, F, etc.) are supplied with resistance values that are within
specified segments of the device’s full range of resistance.
Feature
• Narrow resistance range.
Benefits
• Can help provide greater flexibility for design engineers.
• Lower resistance devices can help provide increased loop length on line card designs.
• Higher resistance devices may help provide greater protection by offering faster time-to-trip.
Resistance-matched Devices
Resistance-matched devices are supplied such that all parts in one particular package (or reel) are within 0.5Ω of each other
(1.0Ω for TRF250-080T devices). Individual matched packages are supplied from the full resistance range of the specified device.
Feature
• Tighter resistance balance between any two parts in a package.
Benefits
• Resistance-matched devices may help reduce the tip-ring resistance differential, reducing the possibility of line imbalance.
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PolySwitch Resettable Devices
Telecommunications and Networking Devices
TRF*250 -120 T -RA -B-0.5 -2
Packaging
2 = Tape and Reel
0.130 = Special Lead Length in Inches
(Blank) = Bulk
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
Modifier (Optional)
U = Uncoated
S = Straight Lead
T = Fast Trip Device
Hold Current (mA)
Product Series (TRF250, TRF600)
TSx -200 F -RA -B-0.5 -2
Packaging
2 = Tape and Reel
(Blank) = Bulk
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
F = RoHS Compliant, ELV Compliant
Hold Current (mA)
Product Series (TS250, TSV250, TSL250, TS600, TSM600)
TCF*250 -120 T -RA -B-0.5
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
Modifier (Optional)
T = Fast Trip Device
Hold Current (mA)
Product Series
* F = RoHS compliant, ELV compliant
* F = RoHS compliant, ELV compliant
Part Numbering System for PolySwitch Surface-mount Telecommunications and
Networking Devices
Part Numbering System for Chip PolySwitch Telecommunications and
Networking Devices
TRF*250 -120 T -RA -B-0.5 -2
Packaging
2 = Tape and Reel
0.130 = Special Lead Length in Inches
(Blank) = Bulk
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
Modifier (Optional)
U = Uncoated
S = Straight Lead
T = Fast Trip Device
Hold Current (mA)
Product Series (TRF250, TRF600)
TSx -200 F -RA -B-0.5 -2
Packaging
2 = Tape and Reel
(Blank) = Bulk
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
F = RoHS Compliant, ELV Compliant
Hold Current (mA)
Product Series (TS250, TSV250, TSL250, TS600, TSM600)
TCF*250 -120 T -RA -B-0.5
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
Modifier (Optional)
T = Fast Trip Device
Hold Current (mA)
Product Series
* F = RoHS compliant, ELV compliant
* F = RoHS compliant, ELV compliant
TRF*250 -120 T -RA -B-0.5 -2
Packaging
2 = Tape and Reel
0.130 = Special Lead Length in Inches
(Blank) = Bulk
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
Modifier (Optional)
U = Uncoated
S = Straight Lead
T = Fast Trip Device
Hold Current (mA)
Product Series (TRF250, TRF600)
TSx -200 F -RA -B-0.5 -2
Packaging
2 = Tape and Reel
(Blank) = Bulk
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
F = RoHS Compliant, ELV Compliant
Hold Current (mA)
Product Series (TS250, TSV250, TSL250, TS600, TSM600)
TCF*250 -120 T -RA -B-0.5
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
Modifier (Optional)
T = Fast Trip Device
Hold Current (mA)
Product Series
* F = RoHS compliant, ELV compliant
* F = RoHS compliant, ELV compliant
Part Numbering System for PolySwitch Radial-Leaded Telecommunications and
Networking Devices
RoHS
RoHS Compliant, ELV Compliant
Specifications subject to change without notice. ©2018 Littelfuse, Inc.
255
PolySwitch Resettable Devices
Telecommunications and Networking Devices
Warning :
• Users should independently evaluate the suitability of and test each product selected for their own application.
• Operation beyond the maximum ratings or improper use may result in device damage and possible electrical arcing and flame.
• These devices are intended for protection against damage caused by occasional overcurrent or overtemperature fault conditions and should
not be used when repeated fault conditions or prolonged trip events are anticipated.
• Contamination of the PPTC material with certain silicone-based oils or some aggressive solvents can adversely impact the performance of the devices.
• Device performance can be impacted negatively if devices are handled in a manner inconsistent with recommended electronic, thermal and
mechanical procedures for electronic components.
• PPTC devices are not recommended for installation in applications where the device is constrained such that its PTC properties are inhibited,
for example in rigid potting materials or in rigid housings, which lack adequate clearance to accommodate device expansion.
• Operation in circuits with a large inductance can generate a circuit voltage (Ldi/dt) above the rated voltage of the device.
Notice:
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own
applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, life-saving, life-
sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the
product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by
Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims
or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse
products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.
RoHS
RoHS Compliant, ELV Compliant Specifications subject to change without notice. ©2018 Littelfuse, Inc. 256
PolySwitch Resettable Devices
Telecommunications and Networking Devices
