This PDF document is about the specifications of the VISHAY VPR220 and VPR221 precision foil power resistors. The resistor is made from Vishay Bulk Metal® foil and offers low TCR, high stability, tight tolerance and fast response time, while being small and easy to install.
The VPR220 (2‑lead) and VPR221 (4‑lead Kelvin) are precision foil power resistors built with Vishay Bulk Metal® foil technology. They offer low temperature coefficient (±5 ppm/°C), high stability (±0.05 % ΔR over 2 000 h), tight tolerance (±0.01 %), and low thermal EMF (0.15 µV/°C). Both models are available in a 8 W chassis‑mounted version and are suitable for applications requiring high accuracy and low noise.
The datasheet lists detailed electrical specifications, mechanical dimensions, power derating curves, and ordering instructions. Tables include resistance ranges (0.5 Ω to 10 kΩ), load‑life stability, operating temperature limits (‑55 °C to +150 °C), and maximum working voltage (300 V). Ordering codes follow Vishay’s part‑number format, e.g., VPR221 5R0000 1.0 % for a 5 Ω, 1 % tolerance device.
| Power rating | 8 W chassis mounted |
|---|---|
| Load Life Stability | ±0.05 % ΔR at rated power for 2 000 h |
| Temperature Coefficient of Resistance (TCR) | ±5 ppm/°C |
| Resistance range | 0.5 Ω to 10 kΩ |
| Tolerance | ±0.01 % |
| Low Thermal EMF | 0.15 µV/°C maximum (lead effect) |
The temperature coefficient of resistance is ±5 ppm/°C.
The VPR220 is offered with resistance values from 0.5 Ω up to 10 kΩ.