Document Number: 63109

For any questions, contact: foil@vishay.com

www.vishay.com

Revision: 30-Oct-08

1

VFCD1505 (Z-Foil Technology)

Vishay Foil Resistors

Z-Foil Surface Mount Flip Chip Voltage Divider

TCR Tracking of 0.1 ppm/°C, Absolute TCR ± 0.05 ppm/°C,

with Resistance Ratio Stability of 0.005 % (50 ppm)

INTRODUCTION

resistor technologies available today for applications that

require ultra high precision and ultra high stability.

The new Z-foil technology provides a significant reduction of

the resistive element’s sensitivity to changes of temperature

due to ambient temperature variations (TCR) and to self

heating when power is applied (power coefficient).

Model VFCD1505 offers low TCR (both absolute and

tracking),

excellent

load

life stability,

tight

tolerance,

excellent ratio stability, low thermal EMF and low current

noise, all in one package. 0.05 ppm/°C absolute TCR

removes errors due to temperature gradients.

The VFCD1505 surface mount divider provides tight

tolerance matching and TCR tracking between 2 resistors

simultaneously etched on one piece of foil on a common

substrate. The electrical specifications of this integrated

construction offers improved performances and better real

estate utilization over discrete resistors and matched pairs.

Our application engineering department is available to

advise and make recommendations for non-standard

technical requirements and special applications, please

contact us.

FEATURES

• Temperature coefficient of resistance (TCR):

absolute: (table 1)

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

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

+ 25 °C ref.)

Tracking: (table 1)

0.1 ppm/°C typical

• Resistance range: 1K to 10K

• Vishay Foil resistors are not restricted to standard values/

ratios, we can supply specific “as required” values/ratios at

no extra cost or delivery (e.g 2K234/5K456)

• Power coefficient tracking: ”ΔR due to self heating”

5 ppm at rated power

• Short time overload: ± 0.005 %

• Tolerance: absolute and resistance ratio: to 0.01 %

• Load life stability (0.1 W at 70 °C, 2000 h)

Absolute: 0.01 %

Ratio: 0.005 %

• Electrostatic discharge (ESD) up to 25 000 V

• Power rating at 70 °C: entire package: 0.1 W, divided

between the two resistors proportionally to their value

• Non-inductive, non-capacitive design

• Thermal EMF: 0.05 µV/°C typical

• Current noise: < - 40 dB

• Rise time: 1 ns effectively no ringing

• Non inductive: < 0.08 µH

• Voltage coefficient: < 0.1 ppm/V

• Non hot spot design

• Terminal finishes available: lead (Pb)-free

tin/lead alloy

• For better performances please contact us

APPLICATIONS

• Instrumentation amplifiers

• Bridge networks

• Differential amplifiers

• Ratio arms in bridge circuits

• Medical and test equipment

• Military

• Airborne etc.

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

FIGURE 1 - POWER DERATING CURVE

FIGURE 2 -SCHEMATIC

Bottom View

100

75

50

25

0

- 75

- 50

- 25

0

+ 25 + 50

+ 75 + 100 + 125 + 150 + 175

Ambient Temperature (°C)

+ 70 °C

- 55 °C

R1

R2

Available

Pb-free

RoHS*

COMPLIANT

Vin

Vout

-

+

VFCD1505