Document Number: 63094

For any questions, contact: foil@vishay.com

www.vishay.com

Revision: 25-Feb-08

1

VCS1625Z (Z-Foil)

Vishay Foil Resistors

Ultra High Precision Z-Foil Surface Mount Current

Sensing Chip Resistors with TCR of ± 0.05 ppm/°C and

Power Coefficient of 5 ppm at Rated Power

Any value at any tolerance available within resistance range

INTRODUCTION

The Z-foil technology provides a significant reduction of the

resistive component’s sensitivity to ambient temperature

variations (TCR) and applied power changes (PCR).

Designers can now guarantee a high degree of stability and

accuracy in

fixed-resistor applications using solutions

based on Vishay‘s revolutionary Z-foil technology.

Model VCS1625Z is a surface mount chip resistor designed

with 4 pads for Kelvin connection. Utilizing Vishay’s Bulk

performance capabilities far greater than other resistor

technologies can supply in a product of comparable size.

0.05 ppm/°C absolute TCR removes errors due to

temperature gradients.

This small device dissipates heat almost entirely through the

pads so surface mount users are encouraged to be generous

with the board’s pads and traces.

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 (TCR):

± 0.05 ppm/°C typical (0 °C to + 60 °C)

± 0.2 ppm/°C typical (- 55 °C to + 125 °C,

+ 25 °C ref.) (see table 1)

• Tolerance: to ± 0.2 %

• Power coefficient “ΔR due to self heating”:

5 ppm at rated power

• Load life stability: 0.02 % at 70 °C, 2000 h at rated power

• Electrostatic discharge (ESD) above 25 000 V

• Short time overload < 0.005 %

• Ohmic values: 0.3 Ω to 10 Ω

(for higher or lower values please contact us)

• Power rating: 1 W at + 70 °C (Figure 1)

• Non inductive, non capacitive design

• Rise time: 1 ns without ringing

• Current rating: 5 A maximum

• Current noise: < - 40 dB

• Voltage coefficient: < 0.1 ppm/V

• Non inductive: < 0.08 µH

• Non hot spot design

• Any value available within resistance range (e.g. 1R234)

• Prototype samples available from 48 h. For more

information, please contact foil@vishay.com

TERMINATIONS

• Two lead (Pb)-free options are available:

gold plated or tin plated

APPLICATIONS

• Medical

• Automatic test equipment (ATE)

• Airborne (in heads-up display

systems)

• High precision instrumentation

• Electron beam recording equipment

• Electron microscopes

• Current sensing applications

• Forced balance electronic scales

• Applications that require superior frequency stability

Note

• Tighter performances are available. Please contact application engineering foil@vishay.com

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

FIGURE 1 - POWER DERATING CURVE

100

75

50

25

0

- 75

- 50

- 25

0

+ 25

+ 50

+ 75 + 100 + 125 + 150 + 175

Ambient Temperature (°C)

+ 70 °C

- 55 °C

Available

Pb-free

RoHS*

COMPLIANT

I

1

E

1

E

2

I

2

R

V

I

I

TABLE 1 - SPECIFICATIONS

MODEL

NUMBER

RESISTANCE

RANGE

RESISTANCE

TOLERANCE

POWER RATING

at + 70 °C

TYPICAL TCR and

MAX. SPREAD

(- 55 °C to + 125 °C, + 25 °C)

MAXIMUM

CURRENT

VCS1625Z

> 2.0

Ω to 10 Ω

0.3

Ω to 2.0 Ω

± 0.2 %, ± 0.5 %; ± 1.0 %

± 0.5 %; ± 1.0 %

1 W

on alumina substrate

(0.5 W on FR4 PCB)

± 0.2 ± 2.8 ppm/°C

5 A