Applications

n

Protection of automotive circuitry including engine control modules

n

Overcurrent surge protection of electronic equipment required to operate at high operating temperature ranges

n

Resettable fault protection for general electronic equipment

MF-USHT Series - PTC Resettable Fuses

Test Procedures and Requirements

Item

Test Condition

Accept/Reject Criteria

Visual/Mechanical

Verify dimensions and materials

Per MF physical description

Resistance

In still air @ 23 °C

Rmin ≤ R ≤ Rmax

Time to Trip

At specified current, Vmax, 23 °C, still air

T ≤ max. time to trip (seconds)

Hold Current

30 min. at Ihold, still air

No trip

Trip Cycle Life

Vmax, Imax, 100 cycles

No arcing or burning

Trip Endurance

Vmax, 48 hours

No arcing or burning

Solderability

245 °C ±5 °C, 5 seconds

95 % min. coverage

Thermal Derating Table - Ihold (Amps)

Model

Ambient Operating Temperature

-40 °C

-20 °C

0 °C

+23 °C

+40 °C

+50 °C

+60 °C

+70 °C

+85 °C

+125 °C

MF-USHT010KX

0.15

0.13

0.12

0.10

0.09

0.08

0.074

0.067

0.056

0.027

MF-USHT010KX/36

0.15

0.13

0.12

0.10

0.09

0.08

0.074

0.067

0.056

0.027

MF-USHT016KX

0.23

0.21

0.19

0.16

0.14

0.13

0.12

0.11

0.09

0.04

MF-USHT016KX/36

0.23

0.21

0.19

0.16

0.14

0.13

0.12

0.11

0.09

0.04

MF-USHT020KX

0.29

0.26

0.23

0.20

0.18

0.16

0.15

0.13

0.11

0.05

MF-USHT020KX/36

0.29

0.26

0.23

0.20

0.18

0.16

0.15

0.13

0.11

0.05

MF-USHT035KX

0.51

0.46

0.41

0.35

0.31

0.28

0.26

0.23

0.20

0.09

MF-USHT050KX

0.73

0.66

0.58

0.50

0.44

0.41

0.37

0.34

0.28

0.14

MF-USHT075KX

1.09

0.98

0.87

0.75

0.66

0.61

0.56

0.50

0.42

0.20

MF-USHT075KX/24

1.09

0.98

0.87

0.75

0.66

0.61

0.56

0.50

0.42

0.20

MF-USHT110KX/16

1.60

1.44

1.28

1.10

0.97

0.89

0.81

0.74

0.62

0.30

MF-USHT125KX/12

1.81

1.64

1.45

1.25

1.10

1.01

0.93

0.84

0.70

0.34

MF-USHT150KX/12

2.18

1.97

1.74

1.50

1.32

1.22

1.11

1.01

0.84

0.41

MF-USHT175KX/12

2.54

2.29

2.03

1.75

1.54

1.42

1.30

1.17

0.98

0.47

MF-USHT200KX/12

2.90

2.62

2.32

2.00

1.76

1.62

1.48

1.34

1.12

0.54

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.