300144Z, 300145Z (Z-Foil)

Tracking to 0.1 ppm/°C, Power Coefficient Tracking of 5 ppm

at Rated Power, and Tolerance Match to 0.005 % (50 ppm)

www.vishay.com

For any questions, contact: foil@vishay.com

Document Number: 63115

2

Revision: 21-Nov-07

Note: Power is proportional to the divider ratio

Example: In a 300144Z (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)

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)

300144Z

0.015 ± 0.005

(0.38 ± 0.13)

0.025 ± 0.005

(0.64 ± 0.13)

1

Low

Resistance

Value Indicator

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

9825

300145Z

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

FIGURE 3 - POWER DERATING CURVE

300144Z, 300145Z

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 - TYPICAL TCR CURVE Z-FOIL

(for more details see table 1)

+ 500

+ 200

+ 100

0

- 100

- 200

- 300

- 500

- 55

- 25

+ 25

+ 60

+ 75

+ 100

+ 125

Ambient Temperature (°C)

ΔR

R

(ppm)

0

0.05 ppm/°C

- 0.1 ppm/°C

0.1 ppm/°C

0.14 ppm/°C

0.2 ppm/°C

- 0.16 ppm/°C

- 400

+ 300

+ 400