300144, 300145

Vishay Foil Resistors

High Precision Voltage Divider Resistors

with TCR Tracking to 0.5 ppm/°C and

Tolerance Match to 0.005 % (50 ppm)

www.vishay.com

For any questions, contact: foil@vishay.com

Document Number: 63045

2

Revision: 21-Nov-07

Note: Power is proportional to the divider ratio

Example: In a 300144 (1K/10K dual), the power rating would be

18 mW on the 1K and 182 mW on the 10K, for a total of 200 mW on

R1 + R2.

FIGURE 1 - TRIMMING TO VALUES (conceptual illustration)

Mutual Inductance

Reduction due

to Change in

Current Direction

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

FIGURE 2 - STANDARD PRINTING AND DIMENSIONS in inches (millimeters)

Tolerance: ± 0.010" (0.25)

1. Lead wires: #22 AWG solder coated copper,

0.75" minimum length

2. Each resistor contains 1 chip of two resistive

elements

23

R2

1

R1

123

VISHAY

9825

0.295

(7.49)

0.320

(8.13)

Date Code

Model No.

0.75

1)

(19.05)

0.1 (2.54)

300144

0.015 ± 0.005

(0.38 ± 0.13)

0.025 ± 0.005

(0.64 ± 0.13)

1

R1 Indicator

(High or

Low Value)

0.1

(2.54)

Match

Tolerance

123

0.75

1)

(19.05)

0.1 (2.54)

0.015 ± 0.005

(0.38 ± 0.13)

0.025 ± 0.005

(0.64 ± 0.13)

23

R2

1

R1

54

R1

6

R2

0.375

(9.53)

0.375

(9.53)

0.2

(5.08)

654

Match

Tolerance

Date Code

Model No.

VISHAY

0730

300145

FIGURE 3 - POWER DERATING CURVE

300144, 300145

200 %

175 %

150 %

125 %

100 %

75 %

50 %

25 %

0

- 75

- 50

- 25

0

+ 25

+ 50

+ 75

+ 100 + 125 + 150 + 175 + 200

Ambient Temperature (

°C)

- 55 °C

+ 70 °C

Double Rated Power

Rated Power

∆

Safe operation

for < 150 ppm

R after 2000

hours load-life.

(

)

(

)

R1

R2

P1 =

P

P2 =

P

R1 + R2

R1 + R2

FIGURE 4 - FOIL RESISTOR TCR COMPARISON

OF FOIL ALLOYS IN MILITARY RANGE

- 50

- 25

0

+ 25

+ 50

+ 75

+ 100

+ 125

- 55

2 ppm/

+ 150

+ 100

+ 50

0

- 50

- 100

- 150

- 200

R

(ppm)

Temperature (°C)