Metal Film Fuse Resistors FMF

Products

Metal Film Fuse Resistors FMF

Features

1.Low temperature coefficient ,high precision, low noise, and good  high frequency performance.2.Can be fusible during the stated time for protecting the circuit once working at the required overload voltage.

2. Operating ambient temperature :-55°C~+275°C

3. The surface is brick red nonflammable coating and indicating a white ring at the behind of the precision color ring.

4.Resistance tolerance:±5%,±10%.

Dimensions and Voltage Performance.

Part No.

Power

Resistance tolerance

Dimensions

Max.
working
Voltage

Max. 
overload voltage

Max. insulation
voltage

L±1

D±0.5

d±0.05

CFM014

1/4W

0R1~10K

6.0

2.3

0.45

200V

400V

300V

CFM12S

1/2WS

0R1~10K

6.0

2.3

0.45

200V

400V

300V

FMF012

1/2W

0R1~10K

9.0

3.2

0.58

250V

500V

500V

FMF01S

1WS

0R1~10K

9.0

3.2

0.58

250V

500V

500V

FMF01B

1W

0R1~10K

11.0

4.5

0.75

350V

700V

710V

FMF02S

2WS

0R1~10K

11.0

4.5

0.75

350V

700V

710V

FMF02B

2W

0R1~10K

15.0

5.0

0.75

350V

700V

710V

FMF03S

3WS

0R1~10K

15.0

5.0

0.75

350V

700V

710V

Fusing Characteristics：

Fusing Spec.

Multiple Rate Power 

Rated resistance range

<2R

2~10R

>10R

Fusing time (s) 

G

12

-

60

30

B

16

60

30

15

C

25

30

15

7.5

J

25

Performance Test 

Test Item

Test Condition

Performance 

Temperature Coefficient

Test the resistance value at normal temperature and normal temperature added 100°C, calculate per °C resistance value change rate.

±250ppm/°C

Short Time overload

10×rated voltage or Max. overload voltage(get the lower) for 5 seconds.

R≤±(1%R0+0.05Ω)

Pulse overload

At 4×rated voltage or Max. pulse overload voltage(get the lower)cycle 10000±200times(1second on,25 seconds off).

R≤±(1%R0+0.05Ω)

Resistance to soldering Heat

Immerge into the 350±10°C tin stove for 2~3seconds. 

R≤±(1%R0+0.05Ω)

Solderability

Immerge into the 245±3°C tin stove for 2~3seconds.

The soldering area is over 95%.

Temperature cycling

At -55°C for 30 min. ,then at+25°C for 10~15°C,then at +125°C for 30 min., then at +25°C for 10~15 min., total 5cycles.

R≤±(1% R0+0.05Ω)

Load life in humidity

Overload rated voltage or Max. working voltage(get the lower) for 1000 hours(1.5hours on and 0.5 hours off) at the 40±2°C and 90~95% relative humidity.

R≤±(5%R0+0.05Ω)

Load life in heat 

Overload rated voltage or Max. working voltage(get the lower) for 1000 hours(1.5hours on and 0.5 hours off) at the 70±2°C.

R≤±(5%R0+0.05Ω)

Nonflammability

Respectively load AC voltage by 5,10,16 times rated power for 5 minutes .

No visible flame.

Note: We can according customer’s requirements to customize the other fusing characteristics resistors .