MF-RHT Datasheet, PDF (1/4 Pages) Bourns Electronic Solutions – PTC Resettable Fuses

*RoHS COMPLIANT
4R1H8705S0
Features
■ Operating temperature range up to 125 °C
■ Low thermal derating factor
■ Higher hold currents at elevated
temperature
■ Choice of operating currents
■ RoHS compliant* and Pb free
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
MF-RHT Series - PTC Resettable Fuses
Electrical Characteristics
Model
V max.
Volts
I max.
Amps
MF-RHT070
16
40
MF-RHT200
16
100
MF-RHT450
16
100
MF-RHT650
16
100
MF-RHT750
16
100
MF-RHT1300
16
100
Ihold
Itrip
Amperes
at 23 °C
Hold
Trip
0.7
1.4
2.0
3.8
4.5
7.8
6.5
12.0
7.5
13.1
13.0
24.0
Resistance
Ohms
at 23 °C
RMin.
R1Max.
(Post Trip)
0.3
0.8
0.045
0.110
0.022
0.054
0.011
0.026
0.0094
0.022
0.0041
0.010
Max. Time
To Trip
Amperes Seconds
at 23 °C at 23 °C
Max.
3.5
4.0
12.5
3.0
22.5
3.0
32.5
5.5
37.5
7.0
60.0
13.0
Tripped
Power
Dissipation
Watts
at 23 °C
Typ.
1.4
1.4
3.6
4.3
4.5
6.9
Environmental Characteristics
Operating Temperature..............................................................-40 °C to +125 °C
Storage Temperature ................................................................-40 °C to +85 °C
Passive Aging ............................................................................+85 °C, 1000 hours ..........................................................±15 % typical resistance change
Humidity Aging ..........................................................................+85 °C, 85 % R.H. 1000 hours ........................................±15 % typical resistance change
Thermal Shock ..........................................................................MIL-STD-202, Method 107, ............................................±10 % typical resistance change
+125 °C to -40 °C,10 cycles
Vibration ....................................................................................MIL-STD-883C, Method 2007.1, Condition A..................No change
Test Procedures And Requirements For Model MF-RHT 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-202, Method 208....................................................95 % min. coverage
Thermal Derating Chart - Ihold (Amps)
Model
MF-RHT070
MF-RHT200
MF-RHT450
MF-RHT650
MF-RHT750
MF-RHT1300
-40 °C -20 °C
0 °C
0.95
0.87
0.79
2.71
2.49
2.26
6.1
5.6
5.1
8.8
8.1
7.4
10.2
9.4
8.6
17.7
16.3
14.8
Ambient Operating Temperature
23 °C
0.7
2.00
4.5
6.5
7.5
13.0
40 °C
0.62
1.77
4.0
5.7
6.6
11.4
50 °C
0.56
1.60
3.6
5.3
6.1
10.5
60 °C
0.51
1.46
3.3
4.8
5.6
9.6
70 °C
0.47
1.34
3.0
4.3
5.0
8.6
85 °C
0.39
1.11
2.5
3.6
4.1
7.2
125 °C
0.17
0.49
1.1
1.6
1.9
3.3
Circuit Protection Division
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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.