Vishay RH and NH Series Wirewound Resistors
Vishay RH and NH Series Wirewound Resistors are industrial-grade, aluminum-housed wirewound resistors designed for high-power systems requiring high thermal performance and long-term stability. These resistors meet MIL-PRF-18546 requirements and offer high operational stability, with less than 1% change in resistance. The RH and NH resistors come in ±0.05%, ±0.1%, ±0.25%, ±0.5%, ±1%, ±3%, and ±5% tolerance options. These resistors feature a power rating range from 7.5W to 250W and operate within a temperature range from -55°C to +250°C. Typical applications include automotive, industrial, medical, and telecommunications.
Features
- Aluminum-housed, chassis-mount wirewound resistor construction
- Available in non-inductive NH versions
- Compliant with MIL-PRF-18546 requirements
- Fully welded construction
- Halogen and lead-free options available
- Low reactive components
- Provides stable operation with less than 1% resistance change
- RoHS-compliant
Applications
- Automotive
- Defense
- Industrial
- Medical
- Telecommunications
Technical Specifications
| Parameters | Values | |
|---|---|---|
| Temperature Coefficient | 10Ω and above | ±20ppm/°C |
| 1Ω to 9.9Ω | ±50ppm/°C | |
| 0.5Ω to 0.99Ω | ±100ppm/°C | |
| Tolerance | ±0.05%, ±0.1%, ±0.25%, ±0.5%, ±1%, ±3%, and ±5% | |
| Frequency Range | 10Hz to 2000Hz | |
| Insulation Resistance | Minimum dry | 10,000MΩ |
| Minimum after moisture test | 1000MΩ | |
| Operating Temperature Range | -55°C to +250°C | |
