AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
TISP4070L3BJ, TISP4350L3BJ
BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
T
R
SD4XAA
Terminals T and R correspond to the
alternative line designators of A and B
Device Symbol
Device VDRM
V
V(BO)
V
‘4070 58 70
‘4350 275 350
Rated for ‘60950 and ‘968 Wave Shapes
How To Order
SMBJ Package (Top View)
Description
These devices are designed to limit overvoltages on the telephone line. Overvoltages are normally caused by a.c. power system or lightning
flash disturbances which are induced or conducted on to the telephone line. A single device provides 2-point protection and is typically used
for the protection of 2-wire telecommunication equipment (e.g. between the Ring and Tip wires for telephones and modems). Combinations of
devices can be used for multi-point protection (e.g. 3-point protection between Ring, Tip and Ground).
The protector consists of a symmetrical voltage-triggered bidirectional thyristor. Overvoltages are initially clipped by breakdown clamping until
the voltage rises to the breakover level, which causes the device to crowbar into a low-voltage on state. This low-voltage on state causes the
current resulting from the overvoltage to be safely diverted through the device. The high crowbar holding current prevents d.c. latchup as the
diverted current subsides. These protectors are guaranteed to voltage limit and withstand the listed lightning surges in both polarities.
After a Type A surge the equipment can be non-operational or operational. An operational pass requires the two high current Type A surges
(200 A, 10/160, and 100A, 10/560), to be reduced to within the TISP4xxxL3BJ ratings (50 A, 10/160 and 30 A, 10/560).
MODEM Protection against:
- TIA/EIA-IS-968 Type A & B surge
(formally FCC Part 68)
- UL 60950, Clause 6. power cross
- CSA 22.2 No. 60950, Clause 6. power cross
Ring-Tip Protection ..........................TISP4350L3BJ
Electronics Protection..........................TISP4070L3BJ
Ion-Implanted Breakdown Region
Precise and Stable Voltage
Low Voltage Overshoot under Surge
S
Type Shape
urge Standard Wave ITSP
A
A TIA/EIA-IS-968 (FCC Part 68)
TIA/EIA-IS-968 (FCC Part 68)
UL 60950 / ITU-T K.21
10/160 µs50
10/560 µs30
B9/720 µs
10/700 µs40
12
T(A)R(B)
MDXXBGE
After a Type B surge, the equipment must be operational. As the TISP4xxxL3BJ has a current rating of 40 A, it will survive both Type B surges,
metallic (25 A, 9/720) and longitudinal (37.5 A, 9/720), giving an operational pass to Type B surges.
............................................ UL Recognized Components
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Device Package Carrier
TISP4xxxL3BJ BJ (J-Bend DO-214AA/SMB) Embossed Tape Reeled TISP4xxxL3BJR-S
Insert xxx value corresponding to protection voltages of 070 and 350
Order As
*RoHS COMPLIANT
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Description (continued)
TISP4xxxL3BJ Overvoltage Protector Series
Overload Ratings, TA = 25 °C (Unless Otherwise Noted)
Rating Symbol Value Unit
Peak overload on-state current, Type A impulse (see Note 4)
IT(OV)M 200
100 A
10/160 µs
10/560 µs
Peak overload on-state current, a.c. power cross tests UL 1950 (see Note 4) IT(OV)M
See Figure 2
for current
versus time
A
NOTE 4: These electrical stress levels may damage the TIS4xxxL3BJ silicon chip. After test, the pass criterion is either that the device is
functional or, if it is faulty, that it has a short circuit fault mode. In the short circuit fault mode, the following equipment is
protected as the device is a permanent short across the line. The equipment would be unprotected if an open circuit fault mode
developed.
Absolute Maximum Ratings, TA = 25 °C (Unless Otherwise Noted)
For metallic protection, the TISP4350L3BJ is connected between the Ring and Tip conductors. For longitudinal protection, two TISP4350L3BJ
protectors are used; one between the Ring conductor to ground and the other between the Tip conductor to ground. The B type ringer has
voltages of 56.5 V d.c. and up to 150 V r.m.s. a.c., giving a peak voltage of 269 V. The TISP4350L3BJ will not clip the B type ringing voltage as
it has a high impedance up to 275 V.
The TISP4070L3BJ should be connected after the hook switch to protect the following electronics. As the TISP4070L3BJ has a high
impedance up to 58 V, it will switch off after a surge and not be triggered by the normal exchange battery voltage.
These low (L) current protection devices are in a plastic package SMBJ (JEDEC DO-214AA with J-bend leads) and supplied in embossed tape
reel pack. For alternative voltage and holding current values, consult the factory. For higher rated impulse currents in the SMB package, the
100 A 10/1000 TISP4xxxH3BJ series is available.
Rating Symbol Value Unit
Repetitive peak off-state voltage ‘4070
‘4350 VDRM ± 58
±275 V
Non-repetitive peak on-state pulse current (see Notes 1, and 2)
ITSP A
10/160 µs (FCC Part 68, 10/160 µs voltage wave shape, Type A) 50
5/310 µs (ITU-T K.21, 10/700 µs voltage wave shape) 40
5/320 µs (FCC Part 68, 9/720 µs voltage wave shape, Type B) 40
10/560 µs (FCC Part 68, 10/560 µs voltage wave shape, Type A) 30
Non-repetitive peak on-state current (see Notes 1, 2 and 3)
ITSM
12
13
2
A
20 ms (50 Hz) full sine wave
16.7 ms (60 Hz) full sine wave
1000 s 50 Hz/60 Hz a.c.
Initial rate of rise of on-state current, Exponential current ramp, Maximum ramp value < 100 A diT/dt 120 A/µs
Junction temperature TJ-40 to +150 °C
Storage temperature range Tstg -65 to +150 °C
NOTES: 1. Initially the TISP4xxxL3BJ must be in thermal equilibrium with TJ=25°C.
2. The surge may be repeated after the TISP4xxxL3BJ returns to its initial conditions.
3. EIA/JESD51-2 environment and EIA/JESD51-3 PCB with standard footprint dimensions connected with 5 A rated printed wiring
track widths. Derate current values at -0.61 %/°C for ambient temperatures above 25 °C.
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
Parameter Test Conditions Min Typ Max Unit
IDRM Repetitive peak off-
state current VD = VDRM TA = 25 °C
TA = 85 °C
±5
±10 µA
V(BO) Breakover voltage dv/dt = ±250 V/ms, RSOURCE = 300 Ω‘4070
‘4350
±70
±350 V
V(BO) Impulse breakover
voltage
dv/dt ≤±1000 V/µs, Linear voltage ramp,
Maximum ramp value = ±500 V
di/dt = ±20 A/µs, Linear current ramp,
Maximum ramp value = ±10 A
‘4070
‘4350
±78
±359 V
I(BO) Breakover current dv/dt = ±250 V/ms, RSOURCE = 300 Ω±40 ±250 mA
VTOn-state voltage IT=±5A, t
W= 100 µs±3V
IHHolding current IT=±5 A, di/dt = -/+ 30 mA/ms ±120 ±350 mA
dv/dt Critical rate of rise of
off-state voltage Linear voltage ramp, Maximum ramp value < 0.85VDRM ±5kV/µs
IDOff-state current VD=±50 V TA = 85 °C±10 µA
Coff Off-state capacitance
f = 100 kHz, Vd=1V rms, V
D=0
VD=1V
VD=5V
f = 100 kHz, Vd=1V rms, V
D=0
VD=1V
VD=5V
‘4070
‘4350
40
38
31
26
24
20
50
48
39
33
30
25
pF
Thermal Characteristics
Electrical Characteristics for the R and T Terminals, TA = 25 °C (Unless Otherwise Noted)
Parameter Test Conditions Min Typ Max Unit
RθJA Junction to free air thermal resistance
EIA/JESD51-3 PCB, IT = ITSM(1000),
TA = 25 °C, (see Note 5) 115
C/W
265 mm x 210 mm populated line card,
4-layer PCB, IT = ITSM(1000), TA = 25 °
°
C52
NOTE 5: EIA/JESD51-2 environment and PCB has standard footprint dimensions connected with 5 A rated printed wiring track widths.
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
Parameter Measurement Information
Figure 1. Voltage-current Characteristic for T and R Terminals
All Measurements are Referenced to the R Terminal
-v VDRM
IDRM
VD
IH
IT
VT
ITSM
ITSP
V(BO)
I(BO)
ID
Quadrant I
Switching
Characteristic
+v
+i
V(BO)
I(BO)
VD
ID
IH
IT
VT
ITSM
ITSP
-i
Quadrant III
Switching
Characteristic
PMXXAAB
VDRM
IDRM
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
Thermal Information
Figure 2. Peak Overload On-state Current against Duration
t - Current Duration - s
0·01 0·1 1 10 100 1000
IT(OV)M — Peak Overload On-State Current — A rms
2
2.5
3
3.5
4
5
6
7
8
9
15
20
25
30
35
40
10
TI4LAA
40 A 100 A2s
2.2 A
7 A
WIRING
SIMULATOR
TISP4xxxL3BJ WILL
CARRY CURRENT
OF TESTS 1 THRU 5
CLAUSE 6.6, UL 1950,
FOR FULL TEST TIME
PEAK OVERLOAD ON-STATE CURRENT
vs
CURRENT DURATION
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
From 2001, the registrations for FCC equipment changed from the FCC to ACTA, Administrative Council for Terminal Attachments. For this
function, ACTA needed to adopt a US National standard specifying terminal equipment requirements. The TIA, Telecommunications Industry
Association, in conjunction with the EIA, Electronic Industries Alliance, created TIA/EIA-IS-968 for this purpose. The first issue of TIA/EIA-IS-968
is essentially a renumbered version of the FCC Part 68 requirement. Clause and figure changes are shown in the table.
FCC Part 68, ACTA, TIA and EIA
To verify the withstand capability and safety of the equipment, standards require that the equipment is tested with various impulse wave forms.
The table below shows values for the TIA/EIA-IS-968 and ITU-T recommendation K.21.
TISP4xxxL3BJ Overvoltage Protector Series
APPLICATIONS INFORMATION
TIA/EIA-IS-968 (FCC Part 68) Impulse Testing
Item FCC Part 68 TIA/EIA-IS-968
Telephone Line Surge – Type A Clause 68.302 (b) Clause 4.2.2
Telephone Line Surge – Type B Clause 68.302 (c) Clause 4.2.3
Simplified Surge Generator Fig. 68.302 (a) Figure 4.1
Open Circuit voltage Wave shape Fig. 68.302 (b) Figure 4.2
Short Circuit Current Wave shape Fig. 68.302 (c) Figure 4.3
Standard
Test
Condition
V
Peak
Vol tage
V
Vol ta ge
Wave Form
µs
Peak
Current
A
Current
Wave Form
µs
Fictive
Impedance
Ω
TISP4xxxL3
Rating
A
Series
Resistance
Ω
TIA/EIA-IS-968
(FCC Part 68)
Longitudinal 1500 10/160 200 10/160 7.5 50 2 x 24
Metallic 800 10/560 100 10/560 8 30 19
Longitudinal 1500 9/720 † 37.5 5/320 † 40 40 0
Metallic 1000 9/720 † 25 5/320 † 40 40 0
ITU-T K.21 ‡
Basic Level Transverse 1500
4000 10/700 37.5
100 5/310 40 30 0
10
ITU-T K.21 ‡
Enhanced Level Transverse 1500
6000 10/700 37.5
125 5/310 40 30 0
10
† TIA/EIA-IS-968 terminology for the wave forms produced by the ITU-T recommendation K.21 10/700 impulse generator
‡ Values assume the TISP4xxxL3 is connected inter-conductor and a 400 V primary is used
If the impulse generator current exceeds the protector’s current rating then a series resistance can be used to reduce the current to the
protector’s rated value to prevent possible failure. The required value of series resistance for a given wave form is given by the following
calculations. First, the minimum total circuit impedance is found by dividing the impulse generator’s peak voltage by the protector’s rated
current. The impulse generator’s fictive impedance (generator’s peak voltage divided by peak short circuit current) is then subtracted from the
minimum total circuit impedance to give the required value of series resistance.
For the TIA/EIA-IS-968 10/560 wave form the following values result. The minimum total circuit impedance is 800/30 = 26.7 Ω and the
generator’s fictive impedance is 800/100 = 8 Ω. For an inter-conductor connected TISP4xxxL3, this gives a minimum series resistance value of
26.7 - 8 = 18.7 Ω. After allowing for tolerance, a 20 Ω ±5 % resistor would be suitable. The 10/160 wave form only needs to be considered if
the TISP4350L3 is connected from the conductor to ground. In this case, the conductor series resistance is 24 Ω ±5 % per conductor.
These electrical safety standards for IT (Information Technology) equipment at the customer premise use the IEC (International Electro-
technical Commission) 60950 standard as the core document. The IEC 60950 covers fundamental safety criteria such as creepage and
isolation. The connection to a telecommunication network voltage (TNV) is covered in clause 6.
Europe is harmonized by CENELEC (Comité Européen de Normalization Electro-technique) under EN 60950 (included in the Low Voltage
Directive, CE mark). Up to the end of 2000, the US had UL (Underwriters Laboratories) 1950 and Canada CSA (Canadian Standards Authority)
C22.2 No. 950. The US and Canadian standards include regional changes and additions to the IEC 60950. A major addition is the inclusion of
clause 6.6, power cross withstand containing the flowchart Figure 18b and annex NAC covering testing. Remarks made for UL 1950 will
generally be true for CSA 22.2 No. 950.
IEC 60950, UL 1950/60950, CSA C22.2 No. 950/60950 and EN 60950
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
In December 2000, UL released UL 60950, which will run concurrently with UL 1950 until 2003, after which submittals can only be made for UL
60950. The equivalent Canadian document is designated CSA C22.2 No. 60950. Changes and differences between UL 1950 and UL 60950 do
not affect power cross testing nor evaluation criteria. Clause and figure numbering has changed between the standards and these changes are
shown in the table. In this document, these two standards are being jointly referred to as UL 60950 and the clause and figure numbering
referenced will be from UL 60950.
IEC 60950, UL 1950/60950, CSA C22.2 No. 950/60950 and EN 60950 (continued)
TISP4xxxL3BJ Overvoltage Protector Series
APPLICATIONS INFORMATION
Item UL 1950 UL 60950
Protection against overvoltage from power line crosses Clause 6.6 Clause 6.4
Overvoltage flowchart Figure 18b Figure 6C
Figure 3 shows the criterion flow for UL 60950 power cross. (This is a modified version of UL6050, Figure 6C — Overvoltage flowchart). There
are many routes for achieving a pass result. For discussion, each criterion has been given a letter reference. Brief details of any electrical
testing is given as a criterion note. Test pass criteria are given in the bottom table of Figure 3.
UL 60950, Clause 6.4 – Power Cross
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
APPLICATIONS INFORMATION
Figure 3. UL 60950 Power Cross Flow Chart
Yes
Yes
IT
Equipment
parameters
Has
≤
100 A
2
s
@ 600 V
† )
Has
≤
1.3 A
d.c.
limiting
‡
)
Has
fire
enclosure
Has
min.
26 AWG
supplied
cord
Pass 6.3.3
ground/line
separation
§ )
Has fire
enclosure
and
spacings
Pass Test 1
Pass test 5
Pass test 2
pass tests
3, 4
Fail
Pass
No overvoltage
testing
No
Yes
No
Yes
No
NoNo
Yes
Yes
No
Yes
No
Yes
Yes
No
No
Yes
UL 60950 (12/2000)
Telecommunication network connection
Clause 6.4 — Protection against overvoltage from power line crosses
Figure 6C — Overvoltage flowchart
Annex NAC (normative) — Power line crosses
Test
1.
600 V, 40 A
,
1.5 s
Test
5.
120 V, 25 A
,
30 min or
open circuit
Test
2.
¶ )
600 V, 7 A, 5 s
Test
3.
#
)
600 V, 2.2 A,
30 min or open circuit (3A)
Test 3A.
# )
600 V, <3.3 A, 30 min, no
open circuit
Test
4.
# )
< Limiting voltage, <2.2 A,
30 min, no open circuit, no
overvoltage protector
voltage limiting
NOTES
† ) Overcurrent protector I t must be lower than any other equipment element which carries the same current.
2
‡ ) UL accepts that a fuse with a 1 A or less rating meets the 1.3 A criterion.
§ ) Pass for 120 V a.c. between telecommunication line and ground current < 10 mA.
¶ ) Test 2 not required if the equipment d.c. breaking is 1.3 A or less, see comment ‡).
# ) Tests 3 and 4 not required for equipment with less than 1000 m of outside cable.
No
AIUL60950A
Pass criteria
No cheesecloth charring
Insulation OK
Wiring simulator (fuse) OK
I
2
t < 100 A
2
s @ 600 V a.c.
Test 1
Test 2
A
B
C
D
E
F
H
G
I
J
Users must verify
requirements
against latest issue
of UL 60950
Connects
to outside
cable
Test 3 Test 3A Test 4 Test 5
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
Power Cross Pass Routes
APPLICATIONS INFORMATION
This discussion covers typical modem flows.
Flow Comment
Box A
The criterion for box A is if the modem connects to an outside TNV line.
The majority of modems will be connected to an outside line, so the answer is
yes. The
yes
path goes to box B.
Box B
The criterion for box B is if the equipment has a limit of
≤
100 A2s at 600 V rms
for Test 1. Many interpret this as a fuse with I2t
≤
100 A2s and often miss the
600 V a.c. breaking requirement. However, the current loop is completed by
the fuse and other equipment compon ents. To ensure that the fuse I2t sets
the equipment performance, the other current loop componen ts, such as the
printed wiring (PW), must have higher I2t values than the fuse. Certainly the
fuse I2t needs to be lower than 100 A2s but other components, for example IC
packaging, may impose a hazard-free limit of 10 A2s. (This conflicts with TIA/
EIA-IS-968 Type A surge pass requirement of 8 A2s.)
A
yes
leads to box C and a
no
to box E.
Boxes E and I
The criterion for box E is for a minimum telecommunications line cord of No.
26 AWG to be supplied or specified.
A
yes
leads to box F and a
no
to box I.
The criterion for box I is to pass Test 1.
If all the four pass criteria of Test 1 are met, this is a
yes
and the flow goes to
box F.
A
no
result fails the equipment.
No tests
B
AN
Y
E
B
A
C
N
Y
Y
Fail
E
F
I
N N
Y Y
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
Power Cross Pass Routes (continued)
APPLICATIONS INFORMATION
Boxes C and D
The criterion for box C is overcurrent protection that reduces currents above
1.3 A. This requirement is met by a 1 A fuse (a 1 A current fusing rating, not an
IEC 1 A current carrying rating).
Modems which pass FCC Part 68 Type B surges and non-operationally pass
Type A surges can use a fuse of 1 A or less, so the
yes
path to box D can be
followed. High performance modems which operationally pass both Type A
and B surges would need a fuse of greater than 1 A and so follow the
no
path
to box F.
The criterion for box D is a fire enclosure.
Few modems can afford fire enclosures. However, for an internal modem in a
known computer case, the case may be evaluated as a fire enclosure. A
successful case evaluation will give a
yes
and an equipment pass.
More likely, the modem will not have a fire enclosure. The
no
flow goes to box
H.
Boxes F and J
The criterion for box F is a pass to clause 6.3.3 requirements.
A
yes
goes to box G and a
no
goes to box J.
The criterion for box J is to pass Test 5.
If all the three pass criteria of Test 5 are met, this is a
yes
and the flow goes to
box G.
A
no
result fails the equipment.
Boxes G and H
The criterion for box G is a fire enclosure and spacings (See box D
comments).
A
yes
result passes the equipment and a
no
result leads to box H.
The criterion for box H is to pass Tests 2, 3 and 4. Test 2 is not required if
there is overcurrent protection that reduces currents above 1.3 A (See box C).
High performance modems, using fuses and without fire enclosures, must
pass tests 2, 3, possibly 3A if the fuse opens, and 4. For standard modems,
using fuses of 1 A or less and without fire enclosures, tests 3, 3A and 4 must
be passed.
If the two pass criteria of each of the tests performed are met, this is a
yes
and the equipment passes.
A
no
result fails the equipment.
Flow Comment
Pass
F
B
A
C
H
D
N
Y
Y
N
Y
Y
Fail
F
G
J
Y
N
Y
N
Y
Y
G
H
Fail
Pass
N
N
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
Fuse Values
There are two areas of fuse criteria; surge capability (TIA/EIA-IS-968 (FCC Part 68) impulse) and power cross capability (UL60950 clause 6.4
and annex NAC).
To survive an impulse, a fuse must have a melting I2t rating greater than the impulse I2t. The fuse I2t rating should be specified for the impulse
waveshape current as the normal d.c. rating may not result in adiabatic conditions. Alternatively, the fuse may be specified for a rated current
under the impulse waveshape conditions.
An exponentially decaying impulse with a current amplitude IPP and 50 % amplitude decay time of tD has an I2t value of 0.72 IPP2tD.
Test waveforms have tolerances and the formula can be approximated to IPP2tD, giving about a 40 % allowance to cover tolerances, e.g.
+5 % on IPP and +30 % on tD. Using the approximate formula, the I2t values for typical waveforms are shown in the table below.
Fuses for TIA/EIA-IS-968
To survive both the Type A surges, a fuse I2t value of greater than 6.4 A2s is needed. Fuses such as the Bel SMP 1.25 will meet this criteria and
they are rated for 60 A, 600 V a.c. interruption.
Fuses must not operate on the Type B surge. To survive a 37.5 A Type B surge, the fuse needs to have an I2t of greater than 0.45 A2s. A non-
operational pass for TIA/EIA-IS-968 Type A impulses is allowed; this could be a design approach with the TISP4xxxL3, which is likely to fail
short with Type A impulses. A fuse with an I2t greater than 0.45 A2s and less than 5.6 A2s would be needed to ensure that the resultant Type A
impulse fault mode disconnects the modem from the line (avoiding a permanent off-hook condition). The Bel SMP 500 fuse starts to operate at
60 % of the specified Type A impulse current levels and is rated for 60 A, 600 V a.c. interruption.
APPLICATIONS INFORMATION
TISP4xxxL3BJ and UL 60950 Power Cross
The TISP4xxxL3BJ conducts current for periods greater than the power cross test times, Figure 2, so the TISP4xxxL3BJ is not a major factor
in UL 60950 compliance. The main design task for UL 60950 power cross is about enclosure design and the selection of the other components
that are subject to power cross. A UL specified fuse together with a TISP4xxxL3BJ gives a simple approach to meeting the power cross
requirements.
Specification Amplitude IPP
A
Current Wave Shape
tt
R/ D (µs)
Melting I2t
A2s
TIA/EIA-IS-968 Type A (FCC Part 68) 200 10/160 6.4
100 10/560 5.6
TIA/EIA-IS-968 Type B (FCC Part 68) 37.5 5/320 0.45
UL 60950 / ITU-T K.21 37.5 5/310 0.45
Telcordia (formally Bellcore)
GR-1089-CORE
500 2/10 2.5
100 10/1000 10
UL 60950, Annex NAC testing requires that the total I2t does not exceed 100 A2s for test 1
K.21 has a.c. induction withstand tests of 1 A2s (basic) and 10 A s (enhanced)
2
Fuse power cross current capability can be determined from its time-current curve. The fuse must be rated to break the current at the applied
power cross a.c. voltage level.
Fuses for ITU-T Recommendation K.21
Like TIA/EIA-IS-968, K.21 requires an operation pass on a 37.5 A, 5/310 transverse current impulse, giving a minimum fuse I2t of 0.45 A2s. This
value may be increased when the coordination test requirements are included. Depending on the conformance level, basic or enhanced, an
a.c. power induction operational pass requires a minimum fuse I2t of either a 1 A2s or a 10 A2s level.
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Fuses for UL 60950
Fuses for the UL 1950 power cross need to break the specified currents at 600 V a.c. - ordinary fuses will not do! Fuse specification terms like
short circuit capabilities to UL 1459 and UL 1950/60950, 40 A, 7 A and 2.2 A at 600 V a.c.
ensure that the 600 V breaking is met.
The requirement of Figure 3, box B, limits the fuse I2t to less than 100 A2s.
Box C, with its 1.3 A limit gives a flow division. Modems passing the TIA/EIA-IS-968 Type A surge in a non-operational mode could use a fuse
of 1 A rating or less and satisfy the 1.3 A limit and move to box D. Modems operationally passing the Type A surge will tend to use a 1.25 A
fuse such as the Bel SMP 1.25, and move to box F. Fuses with ratings of 2 A and above may not operate before the wiring simulator fails
(typically 3 A d.c.).
TISP4xxxL3BJ Overvoltage Protector Series
APPLICATIONS INFORMATION
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxL3BJ Overvoltage Protector Series
Recommended Printed Wiring Footprint
Device Symbolization Code
MECHANICAL DATA
Device Symbolization Code
TISP4070L3BJ 4070L3
TISP4350L3BJ 4350L3
Devices will be coded as below. As the device parameters are symmetrical, terminal 1 is not identified.
Devices are shipped in one of the carriers below. Unless a specific method of shipment is specified by the customer, devices will be shipped in
the most practical carrier. For production quantities, the carrier will be embossed tape reel pack. Evaluation quantities may be shipped in bulk
pack or embossed tape.
Carrier Information
SMB Land Pattern
MDXXBIB
2.54
(.100)
2.40
(.094)
2.16
(.085) MM
(INCHES)
DIMENSIONS ARE:
Carrier
Embossed Tape Reel Pack
Bulk Pack
TISP4xxxL3BJR-S
TISP4xxxL3BJ-S
Order As
“TISP” is a trademark of Bourns, Ltd., a Bourns Company, and is Registered in U.S. Patent and Trademark Office.
“Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries.
