VPR220S, VPR221S

Mount Resistors in TO-220 Configuration with TCR of

± 2 ppm/°C, Tolerance of to ± 0.01 % and Power Rating to 8 W

www.vishay.com

For any questions, contact: foil@vishay.com

Document Number: 63050

2

Revision: 29-Feb-08

Notes

1. Whichever is lower

2. Heat sink chassis dimensions and requirements per MIL-R-39009/1B:

3. Inductance (L) due mainly to the leads

4. The resolution limit of existing test equipment (within the measurement capability of the equipment, or “essentially zero”)

5. µV/°C relates to EMF due to lead temperature difference

FIGURE 2 - TYPICAL TCR CURVE

- 50

- 25

0

+ 20

+ 50

+ 75

+ 100

+ 125

- 55

+ 150

+ 100

+ 50

0

- 50

- 100

- 150

- 200

R

(ppm)

Ambient Temperature (°C)

± 2 ppm/°C (+ 25 °C Reference)

FIGURE 3 - TRIMMING TO VALUES

(Conceptual Illustration)

Mutual Inductance

Reduction due

to Opposing

Current in

Adjacent Lines

Current Path

Before Trimming

Note: Foil shown in black, etched spaces in white

Interloop Capacitance

Reduction in Series

Trimming Process

Removes this Material

from Shorting Strip Area

Changing Current Path

and Increasing

Resistance

Current Path

After Trimming

TABLE 3 - SPECIFICATIONS

Load Life Stability at 2000 h

± 0.05 % max.

ΔR under full rated power at + 25 °C

Power Rating at + 25 °C

Further derating not necessary

Current Noise

< 0.010 µV (rms)/V of applied voltage (- 40 dB)

High Frequency Operation

Rise time

1 ns without ringing

0.1 µH maximum: 0.03 µH typical

Capacitance (C)

1.0 pF maximum: 0.5 pF typical

< 0.1 ppm/V

Operating Temperature Range

- 55 °C to + 150 °C

Maximum Working Voltage

300 V. Not to exceed power rating

0.15 µV/°C maximum (lead effect)

DIMENSION

INCHES

mm

L

6.00

152.4

W

4.00

101.6

H

2.00

50.8

T

0.04

1.0