Environmental Characteristics

Operating/Storage 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 ................................................ +125 °C to -55 °C, 10 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

Test Procedures And Requirements For Model MF-R/90 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 ≤ Rmax

Time to Trip...................................................... 5 times Ihold, 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

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

..................... E174545

TÜV File Number............................................. R2057213

Electrical Characteristics

Model

V max.

Volts

I max.

Amps

Ihold

Itrip

Initial

Resistance

Values

One Hour

Post-Trip

Resistance

Standard

Trip

Max. Time

to Trip

Nominal

Tripped

Power

Dissipation

Amperes

at 23 °C

Ohms

at 23 °C

Ohms

at 23 °C

Amperes

at 23 °C

Seconds

at 23 °C

Watts

at 23 °C

Hold

Trip

Min.

Max.

Max.

Typ.

MF-R055/90

90

10

0.55

1.1

0.45

0.9

2.0

1.6

60

2.0

MF-R055/90U

90

10

0.55

1.1

0.45

0.9

2.0

1.6

28

2.0

MF-R075/90

90

10

0.75

1.5

0.37

0.75

1.65

2.0

60

2.5

Features

insulating material meets UL 94V-0

requirements

Applications

Almost anywhere there is a load to be

protected with a voltage supply of up to

90 V, including:

MF-R/90 Series - PTC Resettable Fuses

Thermal Derating Chart - Ihold / Itrip (Amps)

Model

Ambient Operating Temperature

-40 ºC

-20 ºC

0 ºC

23 ºC

40 ºC

50 ºC

60 ºC

70 ºC

85 ºC

MF-R055/90

0.85 / 1.7

0.75 / 1.5

0.65 / 1.3

0.55 / 1.1

0.45 / 0.9

0.4 / 0.8

0.35 / 0.7

0.3 / 0.6

0.22 / 0.44

MF-R055/90U

0.85 / 1.7

0.75 / 1.5

0.65 / 1.3

0.55 / 1.1

0.45 / 0.9

0.4 / 0.8

0.35 / 0.7

0.3 / 0.6

0.22 / 0.44

MF-R075/90

1.15 / 2.3

1.0 / 2.0

0.9 / 1.8

0.75 / 1.5

0.61 / 1.22

0.55 / 1.1

0.48 / 0.96

0.41 / 0.82

0.30 / 0.6

“U” suffix indicates product without insulation coating.

* 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.