SMW Power Wire Wound Chip Resistors Features: 1. Flameproof UL94V0 molded package, resistant to heat,humidity & insulation. 2. Special design for automatic surface mounting. 3. Excellent mechanical strength & electrical stability. 4. Reducing assembly costs.
SMW Power Wire Wound Chip Resistors
Products | SMW Power Wire Wound Chip Resistors |
Features | 1. Flameproof UL94V0 molded package, resistant to heat,humidity & insulation. 2. Special design for automatic surface mounting. 3. Excellent mechanical strength & electrical stability. 4. Reducing assembly costs. |
Electrical And Mechanical Performance of SMW Power Wire Wound Chip Resistors:
Characteristics | Standards | Test Methods |
Resistance Tolerance | ±5%(J)or ±1%(F) | - |
Resistance Temp. Coeff. | ±200 ppm/°C | -55°C ~ 200°C |
Power Rating Load | Surface temp. 275°C Max.ΔR/R≤±1% | Rated voltage for 30 minutes |
Short Time Overioad | ±1% | 5 times of rated wattage for 5 seconds.
|
Dielectric Withstanding Voltage | No evidence of mechanical damage or insulation breakdown.
| AC 500V for 1 minutes |
Insulation Resistance | 10,000MΩ | DC 500V megger |
Solder-ability | Minimum95%coverage | 235 ± 5°C for 2 seconds |
Resistance to Soldering Heat | No evidence of mechanical damage.ΔR/R≤±1% | 270±5°Cfor 10 ±1 seconds |
Environmental Characteristics of SMW Power Wire Wound Chip Resistors:
Characteristics | Standards | Test Methods |
Temp. Cycle | △R/R≤±1% | -55°C( 30 min.) —►Room Temp.( 3 min.) —► +200°C( 30 min.) —► Room Tenp.( 3 min.) / ( 5 cycles) |
Load Life | △R/R≤±2% | Rated power load 90 minutes ON 30 minutes OFF 70°C 1000 hours |
Moisture-proof Load Life | △R/R≤±2% | Rated power load 90 minutes ON 30 minutes OFF 40°C95%RH 500 hours |
Dimensions of SMW Power Wire Wound Chip Resistors:
Rated Wattage | A±0.3 | B±0.3 | C±0.3 | D±0.3 | E Max. | F±0.3 | Resistance Range(Ω) |
2W | 4.0 | 6.7 | 1.4 | 3.55 | 7.9 | 1.5 | 0.1-200 |
3W | 5.5 | 10.5 | 1.7 | 5.0 | 12 | 2.3 | 0.1-300 |
5W | 7.3 | 13.5 | 1.7 | 6.8 | 17 | 2.5 | 0.1-680 |
Derating Curve of SMW Power Wire Wound Chip Resistors :
For resistors operated in ambient temperatures above 20°C , power rating must be derated in accordance with the curve below.
Surface Temperature Rise of SMW Power Wire Wound Chip Resistors:
