VHP-3, VHP-4, VPR247

Vishay Foil Resistors

Hermetically Sealed Power and Current Sensing Resistor

with TCR of 2 ppm/°C and Power up to 10 Watts

www.vishay.com

For any questions, contact: foil@vishay.com

Document Number: 63005

2

Revision: 31-Oct-07

Kelvin (4-terminal) connections are used for these low ohmic value products to measure a precise voltage drop across the

resistive element. In these applications the contact resistance, lead resistance, and their TCR effect may be greater than that of

the element itself and could cause significant errors if the standard 2-terminal connection is used. Figure 2 shows a high

sensed. This method of measurement is essential for precise current sensing.

TABLE 3 - GENERAL SPECIFICATIONS

Stability

Load life 2000 h

± 0.05 % maximum

ΔR, 3 W in still air at + 25 °C

± 0.05 % maximum

ΔR under full rated power

(10 W at + 25 °C on heat sink)

Shelf life

± 0.0005 % (5 ppm) maximum

ΔR/year

Power Rating

At + 25 °C (see Fig. 1)

3 W or 3 A - free air

Current Noise

< 0.010 µV (RMS)/V of applied voltage

(- 40 dB)

High Frequency Operation

Rise time

1.0 ns at 1 k

Ω without ringing

0.1 µH maximum; 0.08 µH typical

Capacitance (C)

1.0 pF maximum; 0.5 pF typical

Voltage Coefficient

< 0.1 ppm/V

Operating Temperature Range

- 55 °C to + 150 °C

Hermeticity

600 V

0.1 µV/°C maximum (lead effect)

2.5 µV/W maximum (power effect)

FIGURE 1 - POWER DERATING CURVE

+ 100

+ 75

+ 50

+ 25

0

Ambient Temperature (°C)

- 55 °C

Rated Power

- 75 - 50 - 25

0

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

FIGURE 2 - KELVIN CONNECTION

R

∞

0

FIGURE 3 - VHP-3, VHP-4 STANDARD IMPRINTING AND DIMENSIONS in inches (millimeters)

Case not active; insulators not required; mounting hardware not supplied.

Mounting

Hole

0.156 dia (3.9)

± 0.005 (± 0.13)

TO-3 Cap

TO-3 Base

0.040 (1.00) Dia.

± 0.005 (± 0.13)

0.43 (10.92)

± 0.01 (± 0.25)

1.00 (25.4)

± 0.005 (± 0.13)

0.770 (19.56)

Max. Dia.

Mounting

Hole

0.222

(5.64)

E1

E2

I1

I2

0.156 Dia. (3.9)

± 0.005 (± 0.13)

VHP-3

VHP-4 (4 terminal)

Standard Marking

Arrangement

E1

E2

I1

I2

Model Number

VISHAY

VHP-3T

12K500

0.1 %

B0729

Date Code

B

Year

07

Week

29

Resistance

Value

Tolerance

Print Spec