Features
■ Operating temperature range up to 125 °C
■ Low thermal derating factor
Applications
■ 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
■ Higher hold currents at elevated
1
3
temperature
6
A
4
■ Choice of operating currents
■ RoHS compliant*
MF-SMHT Series - PTC Resettable Fuses
Electrical Characteristics
Tripped
Power
Dissipation
Max. Time
To Trip
I
I
trip
Resistance
hold
V max.
Model
I max.
Amps
Amperes
at 23 °C
Ohms
at 23 °C
Amperes
at 23 °C
Seconds
at 23 °C
Watts
at 23 °C
Volts
R
R
Hold
1.36
1.60
Trip
2.72
3.20
Min.
1Max.
0.33
Max.
10.0
10.0
Typ.
2.1
2.1
MF-SMHT136
MF-SMHT160
16
16
100
100
0.085
0.050
8.0
8.0
0.15
Environmental Characteristics
Operating Temperature..............................................................-40 °C to +125 °C
Storage Temperature ................................................................-40 °C to +85 °C
Passive Aging ............................................................................+125 °C, 1000 hours........................................................ 15 ꢀ typiꢁal resistanꢁe ꢁhange
Humidity Aging ..........................................................................+85 °C, 85 ꢀ R.H. 7 days................................................ 15 ꢀ typiꢁal resistanꢁe ꢁhange
Thermal Shoꢁk ..........................................................................MIL-STD-202F, Method 107G, ........................................ 15 ꢀ typiꢁal resistanꢁe ꢁhange
+125 °C to -55 °C,10 ꢁyꢁles
Vibration ....................................................................................MIL-STD-883C, Method 2007.1, Condition A..................No ꢁhange
Test Procedures And Requirements For Model MF-SMHT Series
Test
Test Conditions
Accept/Reject Criteria
Visual/Meꢁh. ......................................Verify dimensions and materials............................................Per MF physiꢁal desꢁription
Resistanꢁe..........................................In still air @ 23 °C ..................................................................Rmin ≤ R ≤ R1max
Time to Trip ........................................At speꢁified ꢁurrent, Vmax, 23 °C ........................................T ≤ max. time to trip (seꢁonds)
Hold Current ......................................30 min. at Ihold......................................................................No trip
Trip Cyꢁle Life ....................................Vmax, Imax, 100 ꢁyꢁles ........................................................No arꢁing or burning
Trip Enduranꢁe ..................................Vmax, 48 hours......................................................................No arꢁing or burning
Solderability ......................................MIL-STD-202F, Method 208F................................................95 ꢀ min. ꢁoverage
Thermal Derating Chart - I
I
(Amps)
hold / trip
Ambient Operating Temperature
23 °C 40 °C 50 °C
Model
-40 °C
-20 °C
0 °C
60 °C
70 °C
85 °C
125 °C
MF-SMHT136
MF-SMHT160
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.
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