246

KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com

Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.

2/22/08

SF

chip type resettable fuses

Performance Characteristics

Derating Curve

Time to Trip Characteristics

environmental applications

160

-55

-35

-15

25

45

65

125

5

Ambient Temperature

(°C)

0

85

105

140

120

100

80

60

40

20

R-T Characteristics

100k

050150

Temperature

(°C)

0.1

100

10k

1k

100

10

1

1

.1

.01

.001

0.1

10

100

1

Current

(A)

.0001

10

100

1000

Parameter

Requirement

Limit

Test Method

Trip Endurance

Use the device which has been left for 15 minutes or more in 25°C

set voltage to be applied to the element at maximum rated voltage.

And set current to be applied within the range between trip current

and maximum rated current

Without damage under 24 hours

of current sending

Trip Cycle Life (ON-OFF Test)

Use the device which has been left for 15 minutes or more in 25°C

set voltage and current to be applied to maximum rated voltage

and maximum rated current respectively. Apply rated voltage for

5 seconds and 55 seconds off

Without damage after 1000 cycles

Cold Resistance

-40°C ± 3°C, 1000 hours

Without Damage

Heat Resistance

85°C ± 3°C, 1000 hours

Without Damage

Humidity Resistance

85°C ± 3°C, 85% RH, 1000 hours

Without Damage

Heat-Cold Cycling

-40°C ± 3°C (30 minutes), +85°C ± 3°C (30 minutes), 20 cycles

Without Damage

—

Part

Designation

Hold

Rating

Max. Rated

Voltage

(DCV)

applications and ratings

Trip

Current

(A)

Initial

Resistance R

Type (Ω)

Resistance

after Tripping

R1 Max. (Ω)

Max. Rated

Current

(A)

SF45N050

0.50A

SF45N075

0.75A

SF45N110

1.10A

15.0

13.2

6.0

40

-40°C

to

+85°C

Power

Dissipation

PD (W)

0.49

0.24

0.15

1.00

1.50

2.20

0.6

Operating

Temperature

Range

0.85

0.41

0.21