Document Number: 63010

For any questions, contact: foil@vishay.com

www.vishay.com

Revision: 12-Jul-07

1

VRM

Vishay Foil Resistors

Resistor with TCR of ± 4 ppm/°C and Tolerance to ± 0.01 %

Any value at any tolerance available with resistance range

The VRM style is a miniaturized version of the now famous

retains all of the inherent performance of foil resistors. It does

not, however, have the value range, power rating, TCR or

lead spacing of the S102C. It is a size for size replacement

for certain wirewounds and finds application in situations

where size constraints dictate the use of this miniature

precision resistor.

Our Application Engineering Department is available to

advise and to make recommendations. For non-standard

technical requirements and special applications, please

contact us.

FEATURES

• Temperature Coefficient of Resistance:

± 4 ppm/°C (0 °C to + 60 °C);

± 8 ppm/°C (- 55 °C to + 125 °C, 25 °C Ref.)

• Resistance Range: 5 Ω to 50 kΩ

• Tolerance: to ± 0.01 %

• Power Rating: 0.25 W at + 70 °C; 0.125 W at + 125 °C

• Load Life Stability: ± 0.05 % Maximum ΔR at + 70 °C at

Rated Power for 2000 hours

• Non Inductive: < 0.08 µH

• Thermal EMF: < 0.1 µV/°C

• Long Term Stability: ± 0.0025 % (25 ppm) per year under

low power and room temperature conditions

• Voltage Coefficient: < 0.1 ppm/V

• Maximum Working Voltage: 250 V

• Terminal Finishes Available: Lead (Pb)-free

Tin/Lead Alloy

• Any value available within resistance range (e.g. 1K234)

• Prototype samples available from 48 hours. For more

information, please contact foil@vishay.com

• For better performances, please see S-Series datasheet

* Pb containing terminations are not RoHS compliant, exemptions may apply

Available

Pb-free

RoHS*

COMPLIANT

FIGURE 1 - IMPRINTING AND DIMENSIONS

DIMENSIONS

INCHES

mm

L:

0.250 ± 0.010

6.35 ± 0.25

H:

0.250 ± 0.010

6.35 ± 0.25

W:

0.125 ± 0.010

3.18 ± 0.25

ST:

0.020 ± 0.010

0.51 ± 0.25

LL:

0.750 Minimum

19.05 Minimum

LS:

0.125 ± 0.005

3.18 ± 0.13

07

Year

10

Week

ST

LS

Model

VISHAY

XXXX

VRM

H

L

Date Code

W

Front View

Rear View

Lead Material

#22 AWG (0.025 Dia)

Solder Coated Copper

Resistance

Value Code

Tolerance

LL

100R01

0.01 %

FIGURE 2 - POWER DERATING CURVE

TABLE 1 - RESISTANCE VALUES VS

TOLERANCE

5

Ω to 50 Ω

50

Ω to 50 kΩ

± 0.1 %

± 0.25 %

± 0.5 %

± 1.0 %

± 0.01 %

± 0.02 %

± 0.05 %

± 0.1 %

± 0.25 %

± 0.5 %

± 1.0 %

+ 100

+ 75

+ 50

+ 25

0

- 25

- 55

0

+ 25 + 50

+ 75 + 100 + 125 + 150 + 175

Ambient Temperature (°C)

+ 155 °C

+ 70 °C