“freeXpansion Design” is a trademark of Bourns, Inc.

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

MF-USMF Series - PTC Resettable Fuses

Typical Time to Trip at 23 ˚C

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.

Thermal Derating Chart - Ihold (Amps)

Model

Ambient Operating Temperature

-40 ˚C

-20 ˚C

0 ˚C

23 ˚C

40 ˚C

50 ˚C

60 ˚C

70 ˚C

85 ˚C

MF-USMF005

0.08

0.07

0.06

0.05

0.04

0.04

0.03

0.03

0.02

MF-USMF010

0.15

0.13

0.12

0.10

0.09

0.08

0.07

0.06

0.05

MF-USMF020

0.32

0.28

0.24

0.20

0.18

0.16

0.14

0.12

0.10

MF-USMF035

0.51

0.46

0.40

0.34

0.30

0.27

0.24

0.22

0.18

MF-USMF050

0.76

0.66

0.58

0.48

0.42

0.38

0.35

0.29

0.23

MF-USMF075

1.10

0.97

0.86

0.72

0.64

0.58

0.55

0.47

0.39

MF-USMF110

1.60

1.42

1.26

1.10

0.94

0.86

0.80

0.70

0.58

MF-USMF150

2.30

2.02

1.76

1.43

1.24

1.11

1.00

0.85

0.65

MF-USMF175X

2.80

2.45

2.10

1.75

1.55

1.45

1.35

1.25

1.10

0.001

0.01

0.1

1

10

100

0.1

1

10

100

Fault Current (Amps)

MF-USMF010

MF-USMF020

MF-USMF035

MF-USMF050

MF-USMF150

MF-USMF175X

MF-USMF110

MF-USMF075

MF-USMF005

How to Order

MF - USMF 010 X - 2

Designator

Series

USMF = 1210 Surface Mount

Component

Hold Current, Ihold

005-175 (0.05-1.75 Amps)

Packaging

Packaged per EIA 481-1

-2 = Tape and Reel

Typical Part Marking

Represents total content. Layout may vary.

PART IDENTIFICATION:

MF-USMF005 = 0

MF-USMF010 = 1

MF-USMF020 = 2

MF-USMF035 = 3

MF-USMF050 = 4

MF-USMF075 = 5

MF-USMF110 = 6

MF-USMF150 = 8

MF-USMF175X = 9

BIWEEKLY DATE CODE:

WEEK 1 AND 2 = A

WEEK 51 AND 52 = Z

6

A

UNDERSCORE

SIGNIFIES

HALOGEN FREE

COMPLIANCE

Asia-Pacific: TEL +886-2 25624117 • FAX +886-2 25624116

Europe: TEL +41-41 7685555 • FAX +41-41 7685510

The Americas: TEL +1-951 781-5500 • FAX +1-951 781-5700

www.bourns.com

MF-USMF SERIES, REV. M, 04/10