MM Metal Film Melf Resistors Features: 1. SMD enabled structure with excellent solder-ability. 2. Conformal multi-layer coating against Humidity. 3. 5% is 3-bands coded ; 2% and under are 4-bands coded.
MM Metal Film Melf Resistors
Products | MM Metal Film Melf Resistors |
Features | 1. SMD enabled structure with excellent solder-ability. 2. Conformal multi-layer coating against Humidity. 3. 5% is 3-bands coded ; 2% and under are 4-bands coded. |
Electrical And Mechanical Performance of MM Metal Film Melf Resistors:
Characteristics | Standards | Test Methods |
Resistance Tolerance | ±5%(J)、±2%(G)、 ±1%(F) | - |
Resistance Temp. Coeff. | ±25ppm/°C , ±50ppm/°C, ± 100ppm/°C | -55°C ~125°C |
Power Rating Load | Surface temp.125°C Max.ΔR/R≤±0.5% | Rated voltage for 30 minutes |
Short Time Overioad | ±0.5% | 2.5 times of rated wattage for 5 seconds.
|
Dielectric Withstanding Voltage | No evidence of mechanical damage or insulation breakdown.
| MM16/MM204:200V AC MM207/MM52: 500V AC
|
Insulation Resistance | 10,00MΩ | DC100Vor 500V megger |
Solder-ability | Minimum95%coverage | 230 ± 5°C for5 seconds |
Resistance to Soldering Heat | No evidence of mechanical damage.ΔR/R≤±1% | 260±5°Cfor 10 ±1 seconds |
Environmental Characteristics of MM Metal Film Melf Resistors:
Characteristics | Standards | Test Methods |
Temp. Cycle | △R/R≤±0.5% | -65°C( 30 min.) —►Room Temp.( 3 min.) —► +125°C( 30 min.) —► Room Tenp.( 3 min.) / ( 5 cycles) |
Load Life | △R/R≤±1.5% | Rated power load 90 minutes ON 30 minutes OFF 70°C 1000 hours |
Moisture-proof Load Life | △R/R≤±1.5% | Rated power load 90 minutes ON 30 minutes OFF 40°C93%RH 56 days |
Dimensions of MM Metal Film Melf Resistors:
Type
| Dimension(mm)
| Resistance Range(Ω)
| Max. Working Voltage
| Max. Overload Voltage
| ||
L | D | B | ||||
MM16(1/6W)
| 3.52±0.08
| 1.35±0.1
| 0.6 Min.
| 0.51 ~10M
| 200V
| 400V
|
MM204(1/4W)
| 3.52± 0.08
| 1.35±0.1
| 0.6 Min.
| 0.51 ~10M
| 200V
| 400V
|
MM207(1/3W)
| 5.90±0.2
| 2.20 ±0.1
| 1.0 Min.
| 0.51 ~10M
| 300V
| 500V
|
MM52(1/2W)
| 5.90±0.2
| 2.20 ±0.1
| 1.0 Min.
| 0.51 ~10M
| 300V
| 500V
|
Derating Curve of MM Metal Film Melf Resistors :
For resistors operated in ambient temperatures above 70°C , power rating must be derated in accordance with the curve below.
Surface Temperature Rise of MM Metal Film Melf Resistors :
