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

P R E C I S I O N

B U L K

F O I L

T E C H N O L O G Y

33

Weight = 1.2 gms Max.

* Maximum specifications.

Higher values available.

0.1 Ohms Available soon.

VISHAY MODELS VPR220 AND VPR221

Precision Foil Power Resistors in TO 220 Configuration

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

0.400

±0.010

(10.16

±0.25)

VISHAY

VPR220

1K0 1%

9801

0.245

±0.010

(6.22

±0.25)

0.141

±0.005 Dia

(3.58

±0.13)

0.540

±0.040

(13.72

±1.02)

0.030

±0.002

(0.76

±0.05)

0.200

±0.005

(5.08

±0.13)

0.115

±0.005

(2.92

±0.13)

0.050

±0.005

(1.27

±0.13)

0.150

±0.008

(3.81

±0.2)

0.615 Max

(15.62)

0.078

±0.005

(1.98

±0.13)

0.015

±0.002

(0.38

±0.05)

0.050

±0.005

(1.27

±0.13)

0.200

±0.030

(5.08

±0.76)

Resistance

Tightest

TCR*

Range (

Ω)

Resistance Tolerance

50 to 10K

±0.01%

±5 ppm/°C

25 to <50

±0.02%

±7 ppm/°C

10 to <25

±0.05%

±10 ppm/°C

5 to <10

±0.1%

±13 ppm/°C

Weight = 1 gm Max.

* Maximum specifications.

Lower values available but not recommended due to high TCR.

FIGURE 2 - VPR221 DIMENSIONS

Resistance

Tightest

TCR*

Range (

Ω)

Resistance Tolerance

10 to 500

±0.01%

±5 ppm/°C

1 to <10

±0.02%

±5 ppm/°C

0.5 to <1

±0.05%

±5 ppm/°C

E

2

0.050

±0.005

(1.27

±0.13)

0.150

±0.008

(3.81

±0.2)

0.615 Max

(15.62)

0.078

±0.005

(1.98

±0.13)

0.015

±0.002

(0.38

±0.05)

0.030

±0.002

(0.76

±0.05)

0.100

±0.005

(2.54

±0.13)

0.400

±0.010

(10.16

±0.25)

VISHAY

VPR221

1K0 1%

9801

0.245

±0.010

(6.22

±0.25)

0.141

±0.005 Dia

(3.58

±0.13)

0.540

±0.040

(13.72

±1.02)

0.115

±0.005

(2.92

±0.13)

0.050

±0.005

(1.27

±0.13)

0.200

±0.030

(5.08

±0.76)

E

1

I

2

I

1