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Feb. 08, 2023 V.0

Melf Metal Film Resistors

4

8

Product Specification

MMF

Through Hole Resistors

ELECTRICAL CHARACTERISTICS

CHARACTERISTICS

MMF-12 MMF25S

MMF204 MMF-25

MMF50S MMF207

MMF-50

MMF1WS

Power Rating

at 70 °C

1/6W

1/4W

0.4W

1/4W

1/2W

0.6W

1/2W

1W

Maximum Working

Voltage

150V

200V

200V

250V

250V

250V

350V

350V

Maximum Overload

Voltage

300V

400V

400V

500V

500V

500V

700V

700V

Voltage Proof on

Insulation

300V

300V

300V

500V

500V

500V

700V

700V

Resistance Range

0.22Ω ~ 3.9Ω for tol ±5%,E96 series value, 4Ω ~ 1MΩ for tol ±1% E24 + E96 series value

Operating Temp.

Range

- 55°C to +155°C

Temperature

Coefficient

±15ppm/°C for 10R-9K99 ， ±25ppm/°C for 100Ω-470KΩ,±50ppm/°C for 4Ω ~ 1MΩ,

±100ppm/°C for 0.22Ω ~ 3.9Ω

Note: For resistance value out of above range is by request.

TEST AND REQUIRMENTS

TEST

TEST METHOD

PROCEDURE

APPRAISE

Short Time Overload

IEC 60115-1 4.13

2.5 times RCWV for 5 sec.(Not more

than maximum overload voltage)

±0.25%+0.005Ω

for≤332KΩ

±0.5%+0.005Ω for>332KΩ

Voltage Proof on

Insulation

IEC 60115-1 4.7

In V-Block for 60 sec. test voltage as

above table

No Breakdown

Temperature Coefficient

IEC 60115-1 4.8

Between -55°C to +155°C

By Type

Insulation Resistance

IEC 60115-1 4.6

In V-Block for 60 sec.

>10,000MΩ

Solderability

IEC 60115-1 4.17

245±5°C for 3±0.5 Sec.

95% Min. coverage

Solvent Resistance of

Marking

IEC 60115-1 4.30

IPA for 5±0.5 Min. with ultrasonic

No deterioration of

coatings and markings

Periodic-pulse Overload

IEC 60115-1 4.39

4 times RCWV 10,000 cycles (1 Sec. on,

25 Sec.off)

±1.0%+0.005Ω

Damp Heat Steady State

IEC 60115-1 4.24

40±2°C,90-95% RH for 56 days, loaded

with 0.1 times RCWV

±1.5%+0.005Ω for≤332KΩ

±2.5%+0.005Ω for>332KΩ

Damp Heat Steady State

(accelerated mode)

IEC 60115-1 4.37

85±2°C,85% RH for 56 days, loaded

with 0.1 times RCWV(no over 100V)

±3.0%+0.005Ω for≤332KΩ

±5.0%+0.005Ω for>332KΩ

Endurance at 70°C

IEC 60115-1 4.25

70±2°C at RCWV(or Umax., whichever

less) for 1,000 Hr.(1.5 Hr.on,0.5 Hr. off)

±0.75%+0.005Ω

for≤332KΩ

±1.0%+0.005Ω for>332KΩ

Temperature Cycling

IEC 60115-1 4.19



-55°C  Room Temp. 

+155°C Room Temp.(5 cycles)

±0.75%+0.005Ω