VISHAY VPR220 VPR221 Data Handbook

VISHAY MODELS VPR220 AND VPR221 Precision Foil Power Resistors in TO 220 Configuration

Models VPR220 AND VPR221, made from Vishay Bulk Metal® foil, offer low TCR, high stability, tight tolerance and fast response time in a small, molded resistor. Model VPR220 is a 2 lead de- vice. Model VPR221 is a 4 lead Kelvin connected device. The 4 leaded version is highly recommended for precision applications requiring ohmic values of 100R or less.

FEATURES Power: 8 watts chassis mounted (per MIL-R-39009) Load Life Stability: ±0.05% maximum ∆R at rated power and temperature for 2,000 hours Temperature Coefficient of Resistance: to ±5 ppm/°C Resistance Range: 0.5 to 10K Ω Tolerance: To ±0.01% Low Thermal EMF: 0.15 µV/°C maximum (lead effect) Non-Inductive Construction Heat sink is Isolated

FIGURE 1 - VPR220 DIMENSIONS FIGURE 2 - VPR221 DIMENSIONS

0.615 Max 0.615 Max

VISHAY VISHAY

VPR220 0.141 ±0.005 Dia VPR221 0.141 ±0.005 Dia 1K0 1% 1K0 1% (3.58 ±0.13)

Resistance Tightest TCR* Resistance Tightest TCR* Range (Ω) Resistance Tolerance Range (Ω) Resistance Tolerance 50 to 10K ±0.01% ±5 ppm/°C

10 to ±0.01% ±5 ppm/°C

25 to <50 ±0.02% ±7 ppm/°C

1 to <10 ±0.02% ±5 ppm/°C

10 to <25 ±0.05% ±10 ppm/°C

0.5 to <1 ±0.05% ±5 ppm/°C

5 to <10 ±0.1% ±13 ppm/°C Weight = 1 gm Max. * Maximum specifications. Weight = 1.2 gms Max. * Maximum specifications. Lower values available but not recommended due to high TCR. Higher values available.

0.1 Ohms Available soon.

VISHAY FOIL RESISTORS, 63 Lincoln Highway, P.O. Box 4004, Malvern, PA 19355-0988 • Phone (610) 644-1300 App. Eng. Phone (610) 251-5289 • App. Eng. Fax (610) 640-4487 • Sales Phone (610) 251-5842 • Sales Fax (610) 640-9081