Features

assembly

Applications

MF-USMF Series - PTC Resettable Fuses

* RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.

** Bourns follows the prevailing definition of “halogen free” in the industry. Bourns considers a product to be “halogen free” if (a) the Bromine (Br) content is 900 ppm or less;

(b) the Chlorine (Cl) content is 900 ppm or less; and (c) the total Bromine (Br) and Chlorine (Cl) content is 1500 ppm or less.Specifications are subject to change without notice.

The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.

Users should verify actual device performance in their specific applications.

Environmental Characteristics

Operating Temperature......................................... -40 °C to +85 °C

Maximum Device Surface Temperature

in Tripped State .................................................... 125 °C

Passive Aging ....................................................... +85 °C, 1000 hours............................................... ±5 % typical resistance change

Humidity Aging...................................................... +85 °C, 85 % R.H. 1000 hours ............................. ±5 % typical resistance change

Thermal Shock ..................................................... +85 °C to -40 °C, 20 times.................................... ±10 % typical resistance change

Solvent Resistance............................................... MIL-STD-202, Method 215 ................................... No change

Vibration ............................................................... MIL-STD-883C, Method 2007.1,........................... No change

Condition A

Electrical Characteristics

Model

V max.

Volts

I max.

Amps

Ihold

Itrip

Resistance

Max. Time

To Trip

Tripped

Power

Dissipation

Amperes

at 23 °C

Ohms

at 23 °C

Amperes

at 23 °C

Seconds

at 23 °C

Watts

at 23 °C

Hold

Trip

RMin.

R1Max.

Typ.

MF-USMF005

30

10

0.05

0.15

2.800

50.000

0.25

1.50

0.6

MF-USMF010

30

10

0.10

0.30

0.800

15.000

0.50

0.60

0.6

MF-USMF020

30

10

0.20

0.40

0.400

5.000

8.00

0.02

0.6

MF-USMF035

6

40

0.35

0.75

0.200

1.300

8.00

0.20

0.6

MF-USMF050

13.2

40

0.50

1.00

0.180

0.900

8.00

0.10

0.6

MF-USMF075

6

40

0.75

1.50

0.070

0.450

8.00

0.10

0.6

MF-USMF110

6

40

1.10

2.20

0.050

0.210

5.00

1.00

0.6

MF-USMF150

6

40

1.50

3.00

0.030

0.110

5.00

5.00

0.6

MF-USMF175X***

6

40

1.75

3.50

0.020

0.090

8.00

1.00

0.7

*** CSA approval pending.

Test Procedures And Requirements For Model MF-USMF 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 .......................................................... ANSI/J-STD-002 ................................................... 95 % min. coverage

UL File Number .................................................... E174545

http://www.ul.com/ Follow link to Certifications, then UL File No., enter E174545

CSA File Number.................................................. CA110338

http://directories.csa-international.org/ Under “Certification Record” and “File Number”

enter 110338-0-000

TÜV Certificate Number ....................................... R 02057213

http://www.tuvdotcom.com/ Follow link to “other certificates”, enter File No. 2057213