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IA
NT
Features

136 4A
Applications

Operating temperature range up to 125 C Low thermal derating factor Higher hold currents at elevated temperature Choice of operating currents RoHS compliant*
Protection of automotive circuitry including engine control modules Overcurrent surge protection of electronic equipment required to operate at high operating temperature ranges Resettable fault protection of general electronic equipment
*R
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PL
MF-SMHT Series - PTC Resettable Fuses
Electrical Characteristics
Ihold Model V max. Volts I max. Amps Itrip Resistance Ohms at 23 C RMin. R1Max. Max. Time To Trip Amperes at 23 C Seconds at 23 C Max.
Tripped Power Dissipation
Amperes at 23 C Hold Trip
Watts at 23 C Typ.
MF-SMHT136 MF-SMHT160
16 16
100 100
1.36 1.60
2.72 3.20
0.085 0.050
0.33 0.15
8.0 8.0
10.0 10.0
2.1 2.1
Environmental Characteristics
Operating Temperature..............................................................-40 C to +125 C Storage Temperature ................................................................-40 C to +85 C Passive Aging ............................................................................+125 C, 1000 hours ........................................................15 % typical resistance change Humidity Aging ..........................................................................+85 C, 85 % R.H. 7 days................................................15 % typical resistance change Thermal Shock ..........................................................................MIL-STD-202F, Method 107G, ........................................15 % typical resistance change +125 C to -55 C,10 cycles Vibration ....................................................................................MIL-STD-883C, Method 2007.1, Condition A..................No change
Test Procedures And Requirements For Model MF-SMHT Series
Test Test Conditions Accept/Reject Criteria Visual/Mech. ......................................Verify dimensions and materials ............................................Per MF physical description Resistance..........................................In still air @ 23 C ..................................................................Rmin R R1max Time to Trip ........................................At specified current, Vmax, 23 C ........................................T max. time to trip (seconds) Hold Current ......................................30 min. at Ihold ......................................................................No trip Trip Cycle Life ....................................Vmax, Imax, 100 cycles ........................................................No arcing or burning Trip Endurance ..................................Vmax, 48 hours......................................................................No arcing or burning Solderability ......................................MIL-STD-202F, Method 208F ................................................95 % min. coverage
Thermal Derating Chart - Ihold / Itrip (Amps)
Ambient Operating Temperature Model MF-SMHT136 MF-SMHT160 -40 C -20 C 0 C 23 C 40 C 50 C 60 C 70 C 85 C 125 C 1.91 / 3.82 1.72 / 3.44 1.54 / 3.08 1.36 / 2.72 1.18 / 2.36 1.09 / 2.18 1.00 / 2.00 0.91 / 1.82 0.77 / 1.54 0.40 / 0.80 2.15 / 4.30 1.96 / 3.92 1.78 / 3.56 1.60 / 3.20 1.42 / 2.48 1.33 / 2.66 1.24 / 2.48 1.15 / 3.30 1.02 / 2.04 0.64 / 1.28
Circuit Protection Division
Asia-Pacific: Tel: +886-2 2562-4117 * Fax: +886-2 2562-4116 Europe: Tel: +41-41 768 5555 * Fax: +41-41 768 5510 The Americas: Tel: +1-951 781-5500 * Fax: +1-951 781-5700 www.bourns.com
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
MF-SMHT Series - PTC Resettable Fuses
Product Dimensions
A Min. 6.73 (0.265) 8.00 (0.315) B C D E F G H Max. Max. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. 7.98 3.00 5.44 0.56 0.71 0.56 0.71 2.16 2.41 0.66 1.37 0.43 (0.314) (0.118) (0.214) (0.022) (0.028) (0.022) (0.028) (0.085) (0.095) (0.026) (0.054) (0.017) 9.50 3.00 6.71 0.56 0.71 0.56 0.71 3.68 3.94 0.66 1.37 0.43 (0.374) (0.118) (0.264) (0.022) (0.028) (0.022) (0.028) (0.145) (0.155) (0.026) (0.054) (0.017)
UNIT = MM (INCHES)
Model MF-SMHT136 MF-SMHT160
Packaging: TAPE & REEL: MF-SMHT136 = 2000 pcs. per reel; MF-SMHT160 = 1500 pcs. per reel.
Typical Part Marking
C G B
Represents total content. Layout may vary.
MANUFACTURER'S TRADEMARK PART IDENTIFICATION DATE CODE WEEK 1 OF 2004 = 4A (YEAR & WEEK) WEEK 27 OF 2004 = A4 (WEEK & YEAR)
Terminal material: Tin-plated brass
F
H D A E
136 4A
End View
Side View
How to Order
Recommended Pad Layout MF-SMHT136
2.3 0.1 (0.09 0.004)
Recommended Pad Layout MF-SMHT160
2.3 0.1 (0.09 0.004)
MF - SMHT 136 - 2
Multifuse(R) Product Designator Series SMHT = Surface Mount Component Hold Current, Ihold 136 - 160 (1.36 - 1.60 Amps)
9.7 0.1 (0.38 0.004) 3.1 0.1 (0.12 0.004) 3.1 0.1 (0.12 0.004) 4.6 0.1 (0.18 0.004) 10.7 0.1 (0.42 0.004) 4.6 0.1 (0.18 0.004)
Packaging Options - 2 = Tape and Reel* *Packaged per EIA-481-2
Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
MF-SMHT Series - PTC Resettable Fuses
Typical Time to Trip at 23 C
10
MF-SMHT160 MF-SMHT136
1
Time to Trip (Seconds)
0.1
0.01
0.001 1 10 100
Fault Current (Amps)
The Time to Trip curves represent typical performance of a device in a simulated application environment. Actual performance in specific customer applications may differ from these values due to the influence of other variables.
Solder Reflow Recommendations
300 250 200 150 100 50 0 160-220 10-20 Time (seconds) 120
Preheating
Soldering
Cooling
Solder reflow * Recommended reflow methods: IR, vapor phase oven, hot air oven. * Devices are not designed to be wave soldered to the bottom side of the board. * Gluing the devices is not recommended. * Recommended maximum paste thickness is 0.25 mm (.010 inch). * Devices can be cleaned using standard industry methods and solvents. Note: * If reflow temperatures exceed the recommended profile, devices may not meet the performance requirements. Rework * A device should not be reworked.
Temperature (C)
Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
MF-SMHT SERIES, REV. D, 08/05
MF-SMHT Series Tape and Reel Specifications
Tape Dimensions W P0 P1 P2 A0 B0 B1 max. D0 F E1 E2 min. T max. T1 max. K0 Leader min. Trailer min. Reel Dimensions A max. N min. W1 W2 max.
MF-SMHT136 per EIA-481-2
16.0 0.3 (0.630 0.012) 4.0 0.1 (0.157 0.004) 8.0 0.1 (0.315 0.004) 2.0 0.1 (0.079 0.004) 5.7 0.1 (0.224 0.004) 8.1 0.1 (0.319 0.004) 12.1 (0.476) 1.5 + 0.1/-0.0 (0.059 + 0.004/-0) 7.5 0.1 (0.295 + 0.004) 1.75 0.1 (0.069 0.004) 14.25 (0.561) 0.6 (0.024) 0.1 (0.004) 3.4 0.1 (0.134 0.004) 390 (15.35) 160 (6.30)
MF-SMHT160 per EIA 481-2
16.0 0.3 (0.630 0.012) 4.0 0.1 (0.157 0.004) 12.0 0.1 (0.472 0.004) 2.0 0.1 (0.079 0.004) 6.9 0.1 (0.272 0.004) 9.6 0.1 (0.378 0.004) 12.1 (0.476) 1.5 + 0.1/-0.0 (0.059 + 0.004/-0) 7.5 0.1 (0.295 + 0.004) 1.75 0.1 (0.069 0.004) 14.25 (0.561) 0.6 (0.024) 0.1 (0.004) 3.4 0.1 (0.134 0.004) 390 (15.35) 160 (6.30)
360 (14.17) 50 (1.97) 16.4 + 2.0/ -0.0 (0.646 + 0.079/-0) 22.4 (0.882)
360 (14.17) 50 (1.97) 16.4 + 2.0/ -0.0 (0.646 + 0.079/-0) 22.4 (0.882)
UNIT =
MM (INCHES)
P0 T D0 P2
E1
W2(MEASURED AT HUB)
COVER TAPE F B1 B0 K0 T1 P1 A0 W1(MEASURED AT HUB) E2 W A N(HUB DIA.)
Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.

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