MELF Resistor

Products

MELF Resistor

Features

1.Low temperature coefficient, high precision, good high frequency performance.

2.Operating ambient temperature: -55~+155

3.Film the metal in Vacuum, the surface coats blue resin with the good waterproof.
4. Resistance range: ±0.1%、±0.25%、±1%、±5%.

Part No.

Type

Power

Resistance range

（mm）Dimensions

Max.working voltage

Max.insulation voltage

L±0.5

D±0.2

MEF020414

0204

1/4W

1R~10M

3.5

1.3

250V

300V

MEF020412

0204

1/2W

1R~10M

3.5

1.3

250V

500V

MEF020712

0207

1/2W

1R~10M

5.7

2.1

300V

600V

MEF02071S

0207

1W

1R~10M

6.0

2.1

350V

700V

MEF04112S

0411

2W

1R~10M

8.7

3.1

400V

800V

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. 

±5 ~50ppm/°C

Short time overload

2.5 x rated voltage or max.overload voltage(get the lower) for 5 seconds.

ΔR≤±(0.5%R0+0.05Ω)

Pulse  overload 

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

ΔR≤±(1% R0+0.05Ω)

Resistance to solderling heat

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

ΔR≤±(0.5%R0+0.05Ω)

Solderability

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

The solderling area is over 95%.

Temperature cycling 

At -55°C for 30min,then at +25°C for 10-15min,then at +155°C for 30min,then at +25°C for 10-15min,total 5cycles.

ΔR≤±(0.5%R0+0.05Ω)

Load life in humidity

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

ΔR≤ ±(2% R0+0.05Ω)