VFP-3, VFP-4

Vishay Foil Resistors

Current Sensing Resistors with TCR of 2 ppm/°C,

Tolerance to ± 0.01 % and power up to 10 Watts

www.vishay.com

For any questions, contact: foil@vishay.com

Document Number: 63014

2

Revision: 29-Aug-07

FIGURE 1 - STANDARD IMPRINTING AND DIMENSIONS in inches (millimeters)

1.575 ± 0.016 (40.01 ± 0.41)

0.276

(7.01

)

1.181 ± 0.016 (30 ± 0.41)

E2

1.575 ± 0.016 (40.01 ± 0.41)

0.150 ± 0.004

(3.81 ± 0.1)

E1

I2

I1

0.197 (5.00)

0.197 (5.00)

0.150 ± 0.004

(3.81 ± 0.1)

0.394 ± 0.008

(10.01 ± 0.2)

0.394 ± 0.008

(10.01 ± 0.2)

Lead Dia.

0.025 (0.633)

Solder Coated

Copper

Lead Dia.

0.025 (0.64)

Solder Coated

Copper

0.600 (15.24)

0.200 [x3] (5.08)

0.118 (3.00)

0.118 (3.00)

0.787 ± 0.016

(19.99 ± 0.41)

0.787 ± 0.016

(19.99 ± 0.41)

1.00 Min.

(25.4 Min.)

1.00 Min.

(25.4 Min.)

0.276

(7.01

)

+ 0.004

+ 0.1

- 0.008

- 0.2

+ 0.004

+ 0.1

- 0.008

- 0.2

VISHAY

VFP-3

(Value)

(Tol.)

(Date Code)

VISHAY

VFP-4

(Value)

(Tol.)

(Date Code)

VFP-4

VFP-3

1.181 ± 0.016 (30 ± 0.41)

TABLE 3 - SPECIFICATIONS

Stability

Load Life at 2000 hours

± 0.05 % maximum

ΔR under full rated power (3 W at + 25 °C)

Power Rating

At + 25 °C

Power rating based on

ΔR. Further derating not necessary.

Current Noise

< 0.010 µV (RMS)/V of applied voltage (- 40 dB)

High Frequency Operation

Rise Time

1.0 ns at 1 k

Ω

0.1 µH maximum; 0.08 µH typical

Capacitance (C)

1.0 pF maximum; 0.5 pF typical

Voltage Coefficient

Operating Temp. Range

- 55 °C to + 150 °C

350 V

0.5 µV/°C typical (lead effect)

FIGURE 2 - POWER DERATING CURVE

+ 100

+ 75

+ 50

+ 25

0

- 75 - 50 - 25

0 + 25 + 50 + 75 + 100 + 125 + 150 + 175

Ambient Temperature (°C)

- 55 °C

Rated Power

FIGURE 3 - 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