PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/14/19
Surface Mount > Automotive ASMD Series
Automotive ASMD Series RoHS
Electrical Characteristics
Part
Number
IH(A)@ IH(A)@ ITVMAX IMAX PD Typ Max Time-to-trip RMIN R1MAX RaMAX
(R1MAX) (RaMAX) (A) (VDC) (A) (W) (A) (s) (Ω) (Ω) (Ω)
ASMD – 16-60V
ASMD030F 0.23 0.23 0.59 60 10 1. 1 1. 15 12.0 0.980 4.800 4.800
ASMD050F 0.37 0.37 0.98 60 10 1. 7 1.95 20.0 0.290 1.400 1.400
ASMD075F 0.60 0.60 1.48 30 40 1. 1 3.00 20.0 0.290 1.000 1.000
ASMD100F 0.90 0.90 2.16 30 40 1. 1 4.50 20.0 0.098 0.480 0.480
ASMD125F 1.04 1.04 2.46 16 40 1. 1 5.20 20.0 0.057 0.250 0.250
ASMD150F 1.27 1.27 2.95 16 40 1. 2 6.35 25.0 0.049 0.250 0.250
ASMD150F/33 1.20 1.20 2.88 33 40 1. 9 6.00 14.0 0.068 0.230 0.230
ASMD185F 1.85 1.85 3.70 16 40 1.5 9.25 11.3 0.032 0.126 0.126
ASMD200F 1.73 1.73 3.93 16 40 1. 2 8.65 30.0 0.050 0.120 0.120
ASMD250F 1.97 1.97 5.00 16 40 1. 2 9.85 30.0 0.035 0.085 0.085
Description
Helping to reduce weight of wire harnesses. PPTC devices
distributed in a circuit can allow the use of smaller wire
sizes with the resulting harnesses. Forego looping back
and forth around a fuse box and place your protection
wherever you see fit. The solid state composition of
PPTC devices helps provide reliability.
Applications
• Automotive and industrial transportation
• Actuators and medium motors
• Trace protection
• Harness/junction box protection
• Powered outputs
• Electronic control modules
• Telematics/Infotainment
Benefits
• Expertise from the world’s leading resettable overcurrent
protection manufacturer
• Wide range of dedicated automotive surface-mount and
radial-leaded resettable overcurrent devices
• High performance transient voltage protection devices
Additional Information
Datasheet Resources Samples
Notes:
IH : Hold current: maximum current device will pass without interruption in 25°C, unless otherwise specified
IT : Trip current: minimum current that will switch the device from low-resistance to high-resistance in 25°C still air, unless otherwise specified.
VMAX : Maximum voltage device can withstand without damage at rated current.
IMAX : Maximum fault current device can withstand without damage at rated voltage.
PD : Power dissipated from device when in the tripped state in 25°C still air, unless otherwise specified.
RMIN : Minimum resistance of device as supplied at 25°C, unless otherwise specified.
R1MAX : Maximum resistance of device when measured one hour post reflow, unless otherwise specified.
RaMAX : Maximum functional resistance of device after being subjected to the stresses described in PS400 at 25°C, unless otherwise specified.
Features
• Products meet applicable automotive industry standards
• Compatible with high-volume electronics assembly
• Resettable solution against overcurrent and short-circuit
• AEC-Q200 qualified, RoHS compliant, and
ISO/TS16949 certified
• Surface-mount form factor
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/14/19
Surface Mount > Automotive ASMD Series
0
50
100
150
200
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (°C)
% of Rated Hold and Trip Current
Temperature Rerating Curve
Temperature Rerating
Maximum Ambient Temperature
Part Number -40°C -20°C 0°C 20°C 25°C 40°C 50°C 60°C 70°C 85°C
Hold Current (A)
ASMD – 16-60V
ASMD030F 0.35 0.31 0.27 0.23 0.22 0.19 0.17 0.15 0.13 0.11
ASMD050F 0.59 0.53 0.46 0.39 0.37 0.33 0.29 0.26 0.23 0.18
ASMD075F 0.91 0.81 0.71 0.60 0.58 0.50 0.45 0.40 0.35 0.28
ASMD100F 1.37 1.22 1.06 0.90 0.86 0.76 0.68 0.60 0.52 0.41
ASMD125F 1.58 1.40 1.23 1.04 1.00 0.87 0.78 0.70 0.60 0.48
ASMD150F 1.93 1.70 1.50 1.27 1.22 1.07 0.95 0.85 0.74 0.58
ASMD150F/33 1.96 1.73 1.50 1.26 1.20 1.03 0.91 0.80 0.68 0.51
ASMD185F 2.93 2.58 2.30 1.93 1.85 1.62 1.44 1.30 1.12 0.88
ASMD200F 2.63 2.34 2.04 1.73 1.66 1.45 1.30 1.16 1.00 0.80
ASMD250F 3.00 2.66 2.32 1.97 1.89 1.65 1.48 1.32 1.14 0.91
PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/14/19
Surface Mount > Automotive ASMD Series
Typical Time-to-Trip Curves at 25°C
ASMD
A = ASMD030F
B = ASMD050F
C = ASMD075F
D = ASMD100F
E = ASMD125F
F = ASMD150F, ASMD150F/33
G = ASMD185F
H = ASMD200F
I = ASMD250F
Time-to-Trip (s)
Fault Current (A)
100
10
1
0.1
0.01
10.1 10010
A
A
B
C
D
E
BCD
EF
F
G
G
H
H
I
I
Physical Specifications
Terminal Pad Material 98%+ Tin-plated Brass
Soldering Characteristics Solderability per ANSI-J-STD-002 Category 1
Solder Heat Withstand per IEC 60068-2-20, Test Tb, Section 5, Method 1a
Flammability Resistance per IEC 60695-11-5 Needle Flame Test for 20 seconds
Recommended Storage
Conditions 40°C max, 70% RH max; Devices May Not Meet Specified Ratings if Storage Conditions are Exceeded
Operation Temperature -40°C~85°C
Note: See PS400 for other physical specifications.
Environmental Specifications
Test Conditions Resistance Change
Passive Aging 60°C, 1000 hrs
85°C, 1000 hrs
±3% Typical
±5% Typical
Humidity Aging 85°C, 85% R.H., 100 hrs ±1.2% Typical
Thermal Shock 85°C, -40°C 20 times
125°C, -55°C 10 times
-33% Typical
-33% Typical
Solvent Resistance
Freon
Trichloroethane
Hydrocarbons
No change
No change
No change
Note: See PS400 for other environmental specifications.
Moisture Resistance Level Level 2a, J-STD-020
Storage Conditions 40°C max, 70% RH max; devices should remain in original sealed bags prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/14/19
Surface Mount > Automotive ASMD Series
Figure 1
Dimension Figures
B
F
BG
A
DE
C
C
F
A
D
H
E
Dimensions
Part Number
Dimensions in Millimeters (Inches)
Figure
A B C D E F G H
Min Max Min Max Min Max Min Max Min Max Min Max Min Max Min Max
ASMD – 16-60V
ASMD030F
6.73 7.98 —3.18 4.8 5.44 0.56 0.71 0.56 0.71 2.16 2.41 0.66 1.37 0.43 —
1
(0.265) (0.314) (0.125) (0.19) (0.214) (0.022) (0.028) (0.022) (0.028) (0.085) (0.095) (0.026) (0.054) (0.017)
ASMD050F
6.73 7.98 —3.18 4.8 5.44 0.56 0.71 0.56 0.71 2.16 2.41 0.66 1.37 0.43 —
1
(0.265) (0.314) (0.125) (0.19) (0.214) (0.022) (0.028) (0.022) (0.028) (0.085) (0.095) (0.026) (0.054) (0.017)
ASMD075F
6.73 7.98 —3.18 4.8 5.44 0.56 0.71 0.56 0.71 2.16 2.41 0.66 1.37 0.43 —
1
(0.265) (0.314) (0.125) (0.19) (0.214) (0.022) (0.028) (0.022) (0.028) (0.085) (0.095) (0.026) (0.054) (0.017)
ASMD100F
6.73 7.98 —3.00 4.8 5.44 0.56 0.71 0.56 0.71 2.16 2.41 0.66 1.37 0.43 —
1
(0.265) (0.314) (0.118) (0.19) (0.214) (0.022) (0.028) (0.022) (0.028) (0.085) (0.095) (0.026) (0.054) (0.017)
ASMD125F
6.73 7.98 —3.00 4.8 5.44 0.56 0.71 0.56 0.71 2.16 2.41 0.66 1.37 0.43 —
1
(0.265) (0.314) (0.118) (0.19) (0.214) (0.022) (0.028) (0.022) (0.028) (0.085) (0.095) (0.026) (0.054) (0.017)
ASMD150F
8.00 9.40 —3.00 6.0 6.71 0.56 0.71 0.56 0.71 3.68 3.94 0.66 1.37 0.43 —
1
(0.315) (0.370) (0.118) (0.24) (0.264) (0.022) (0.028) (0.022) (0.028) (0.145) (0.155) (0.026) (0.054) (0.017)
ASMD150F/33
8.00 9.40 —3.00 6.0 6.71 0.56 0.71 0.56 0.71 3.68 3.94 0.66 1.37 0.43 —
1
(0.315) (0.370) (0.118) (0.24) (0.264) (0.022) (0.028) (0.022) (0.028) (0.145) (0.155) (0.026) (0.054) (0.017)
ASMD185F
8.00 9.40 —3.00 6.0 6.71 0.56 0.71 0.56 0.71 3.68 3.94 0.66 1.37 0.43 —
1
(0.315) (0.370) (0.118) (0.24) (0.264) (0.022) (0.028) (0.022) (0.028) (0.145) (0.155) (0.026) (0.054) (0.017)
ASMD200F
8.00 9.40 —3.00 6.0 6.71 0.56 0.71 0.56 0.71 3.68 3.94 0.66 1.37 0.43 —
1
(0.315) (0.370) (0.118) (0.24) (0.264) (0.022) (0.028) (0.022) (0.028) (0.145) (0.155) (0.026) (0.054) (0.017)
ASMD250F
8.00 9.40 —3.00 6.0 6.71 0.56 0.71 0.56 0.71 3.68 3.94 0.66 1.37 0.43 —
1
(0.315) (0.370) (0.118) (0.24) (0.264) (0.022) (0.028) (0.022) (0.028) (0.145) (0.155) (0.026) (0.054) (0.017)
PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/14/19
Surface Mount > Automotive ASMD Series
Packaging and Marking Information
Recommended Pad Layout Figures
[mm (in)]
Part
Number
Tape and Reel
Quantity
Standard
Package
Part
Marking
Dimension A
(Min*/Nom)
Dimension B
(Nom)
Dimension C
(Nom)
ASMD – 16-60V
ASMD030F 2,000 10,000 030F 3.1 (0.12) 2.3 (0.09) 5.1 (0.201)
ASMD050F 2,000 10,000 050F 3.1 (0.12) 2.3 (0.09) 5.1 (0.201)
ASMD075F 2,000 10,000 075F 3.1 (0.12) 2.3 (0.09) 5.1 (0.201)
ASMD100F 2,000 10,000 100F 3.1 (0.12) 2.3 (0.09) 5.1 (0.201)
ASMD125F 2,000 10,000 125F 3.1 (0.12) 2.3 (0.09) 5.1 (0.201)
ASMD150F 1,500 7,500 150F 4.6 (0.18) 2.3 (0.09) 6.1 (0.240)
ASMD150F/33 1,500 7,500 153F 4.6 (0.18) 2.3 (0.09) 6.1 (0.240)
ASMD185F 1,500 7,500 185A 4.6 (0.18) 2.3 (0.09) 6.1 (0.240)
ASMD200F 1,500 7,500 200F 4.6 (0.18) 2.3 (0.09) 6.1 (0.240)
ASMD250F 1,500 7,500 250F 4.6 (0.18) 2.3 (0.09) 6.1 (0.240)
Recommended Pad Layout
A
B
CB
* These devices are intended for use in automotive applications.
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/14/19
Surface Mount > Automotive ASMD Series
Solder Reflow Recommendations
Solder Reflow
• Recommended reflow method: IR, hot air, nitrogen.
• Recommended maximum paste thickness: 0.25mm (0.010in)
• Devices can be cleaned using standard methods and aqueous solvents.
• Experience has shown the optimum conditions for forming acceptable solder fillets occur when a reasonable amount of solder paste is
placed underneath each device’s termination. As such, we request that customers comply with our recommended solder pad layouts.
• Customer should validate that the solder paste amount and reflow recommendations meet its application.
• We request that customer board layouts refrain from placing raised features (e.g. vias, nomenclature, traces, etc.) underneath PolySwitch
devices. It is possible that raised features could negatively impact solderability performance of our devices.
Rework
•
Standard industry practices. (Please also avoid direct contact to the device.)
Critical Zone
TL to Tp
Ramp Up
t 25˚C to Peak
Reflow Profile Time
Ramp Down
ts
Preheat
TsMAX
TL
Tp
tp
25
TsMIN
tL
Temperature
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) 60-120 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) 30 s max
Ramp down rate 3°C/s max
Time 25°C to peak temperature 8 min max
Note: All temperatures refer to topside of the package, measured on the package body
surface.
ASMD 150 F /33 -2
Packaging
2 = Tape and Reel
Alternative Voltage Rating (If Applicable)
Lead Free
Hold Current Indicator
Product Series
Part Ordering Number System
PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/14/19
Surface Mount > Automotive ASMD Series
Tape and Reel Specifications
Description
ASMD
EIA 481-2
ASMD030F
ASMD050F
ASMD075F
ASMD100F
ASMD125F
ASMD150F
ASMD150F/33
ASMD185F
ASMD200F
ASMD250F
W16.0 ± 0.30 16.0 ± 0.30
P04.0 ± 0.10 4.0 ± 0.10
P18.0 ± 0.10 12.0 ± 0.10
P22.0 ± 0.10 2.0 ± 0.10
A05.6 ± 0.23 6.9 ± 0.23
B08.1 ± 0.15 9.6 ± 0.15
B1 max 12.1 12.1
D01.5 + 0.10/ -.00 1.5 + 0.10/ -.00
F7.50 ± 0.10 7.50 ± 0.10
E11.75 ± 0.10 1.75 ± 0.10
E2 min 14.25 14.25
T max 0.4 0.4
T1 max 0.1 0.1
K03.2 ± 0.15 3.4 ± 0.15
A max 330 330
N min 50 50
W116.4 + 2.0/-.00 16.4 + 2.0/-.00
W2 max 22.4 22.4
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/14/19
Surface Mount > Automotive ASMD Series
Tape and Reel Diagrams
P0
E1
E2
FW
P2
D0
A0
B0
P1
B1
T1
K0
T
Cover Tape
Embossment
Center Lines
of Cavity
A
Cover Tape
Embossed Cavity
Carrier Tape
N (Hub Dia.)
W2 (Measured at Hub)
W1 (Measured at Hub)
Figure 1
Figure 2
Disclaimer 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 may not be used in, all applications.
Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
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.
