2R, 3R, 4R (Z-Foil Technology)

Vishay Foil Resistors

Ultra High Precision Z-Foil Voltage Divider and Network Resistor with

TCR Tracking to 0.1 ppm/°C and Resistance Match to ± 0.005% (50 ppm)

www.vishay.com

For technical questions, contact: foil@vishay.com

Document Number: 63114

1

Revision: 08-Aug-06

SALES

• AMERICAS: foilsales.usa@vishay.com

• ASIA/JAPAN: foilsales.asia@vishay.com

• UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com

• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com

• FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com

• ISRAEL: foilsales.israel@vishay.com

FEATURES

• Resistance Range each resistor: 1Ω to 150KΩ

(Any ohmic value ratio is available within

resistance range)

• Non Inductive/Capacitive design

• Low Temperature Coefficient of Resistance

(TCR) Absolute:

± 0.05 ppm/°C (Industrial range)

± 0.2 ppm/°C (MIL range), Tracking 0.1 ppm/°C

• Power Coefficient “ΔR due to self heating”: 5 ppm at rated

power

• Tolerance: Absolute and Resistance Match to 0.005%

• Resistance Ratio Stability: at 0.05W @ + 25°C to 0.001%

• Electrostatic Discharge (ESD) above 25 000 Volts

• Short time overload ≤ 0.002%

• Power Rating at + 125°C: 0.3W

• Thermal EMF: 0.05µV/°C

• Non hot spot design

• Current Noise: < - 40dB

• Rise time: 1ns without ringing

• Non Inductive: < 0.08µH

• Voltage Coefficient < 0.1 ppm/V

• For better performances please contact us

• Terminal Finishes available:

Lead (Pb)-free

Tin/Lead Alloy

RoHS

COMPLIANT

Any value at any tolerance available within resistance range

INTRODUCTION

The 2R, 3R, 4R Resistor Networks are the designers first

choice for ultra high precision, stable and reliable

Voltage Divider or Network.

The Z-Foil Technology provides a significant reduction of the

resistive components sensitivity to ambient temperature

variations (TCR) and applied power changes, self-heating

(PCR). 0.05 ppm/°C Absolute TCR removes errors due to

temperature gradients.

The 2R, 3R, 4R provide a unique, inherent combination

of

performance

characteristics

resulting

in

excellent

performance and high reliability, satisfying the needs of

today’s expanding requirements.

The availability of low absolute TCR and low PCR, provides a

good cost solution for the variability of other components

when compiling the total error budget.

Our Application Engineering Department is available to

advise and to make recommendations for non-standard

technical requirements and special applications, please do

not hesitate to contact us.

FIGURE 1 - POWER DERATING CURVE

FIGURE 2 - TYPICAL TCR CURVE Z-FOIL

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

ΔR after 2000

hours load-life

+ 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

APPLICATIONS

• Instrumentation Amplifiers

• Bridge Networks

• Differential Amplifiers

• Military, Airborne and Space

• EB Applications

• Down-Hole (high temperature)

• Medical

• Automatic Test Equipment (ATE)

FIGURE 3 - TRIMMING TO VALUES

CONCEPTUAL ILLUSTRATION)

Current Path

After Trimming

Current Path

Before Trimming

Trimming Process

Removes this Material

from Shorting Strip Area

Changing Current Path

and Increasing

Resistance

NOTE: Foil shown in black, etched spaces in white