Document Number: 63005

For any questions, contact: foil@vishay.com

www.vishay.com

Revision: 31-Oct-07

1

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

Any value available within resistance range

approach to low value power and current sensing when a

combination of accuracy, tight TCR, low thermal EMF, low

voltage coefficient, Kelvin connection, and long term stability

(under power) are required.

Vishay

Models

VHP-3

and

VHP-4

offer

all

welded

construction and screw mounting directly to a metal heat sink

for maximum heat transfer. Hermetic sealing and nitrogen

back

fill

provide

the

maximum

protection

against

environmental stresses, thereby ensuring long term stability.

A special feature of this construction is Kovar eyelet’s and

OFHC solder plated copper leads providing the lowest

thermal EMFs in the industry.

Vishay Model VPR247 has many of the advantages of the

VHP-4 but with significantly reduced size and weight. It also

has gold plated copper leads.

Our Application Engineering department is available to

advise and to make recommendations. For non-standard

technical requirements and special applications, please

contact us.

FEATURES

± 2 ppm/°C typical (- 55 °C to + 125 °C,

+ 25 °C ref.) (see tables 1 and 2)

• Tolerance: to ± 0.01 % (see tables 1 and 2)

• Power rating (heat-sinked): 10 W

• Load life stability: ± 0.01 % at 25 °C, 2000 h at rated power

• Resistance range: 0.05 Ω to 80 kΩ

• Electrostatic discharge (ESD) above 25 000 V

• Non inductive, non capacitive design

• Rise time: 1.0 ns without ringing

• Current noise: < - 40 dB

• Thermal EMF: 0.05 µV/°C typical

• Voltage coefficient: < 0.1 ppm/V

• Non inductive: 0.08 µH

• Non hot spot design

• Terminal finishes available:

VHP-3 and VHP-4:

lead (Pb)-free

tin/lead alloy

VPR247:

gold plated

• Any value available within resistance range (e.g. 1K234)

• Prototype samples available from 48 h. For more

information, please contact foil@vishay.com

• For better performances, please contact Application

Engineering

Notes

1. Weight of VHP-3 and VHP-4 = 15 g maximum

VPR247 = 7 g maximum

2. Available up to 500

Ω

3. - 55 °C to + 125 °C, + 25 °C ref.

4. See figure 5

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

Available

Pb-free

RoHS*

COMPLIANT

RESISTANCE

RANGE (

Ω)

TIGHTEST

TOLERANCE

TYPICAL

MAXIMUM

50 to 80K

± 0.01 %

± 2 ppm/°C

± 5 ppm/°C

25 to < 50

± 0.02 %

± 7 ppm/°C

10 to < 25

± 0.05 %

± 10 ppm/°C

5 to < 10

± 0.1 %

± 13 ppm/°C

2 to < 5

± 0.25 %

± 20 ppm/°C

1 to < 2

± 0.5 %

± 25 ppm/°C

0.5 to < 1

± 1.0 %

± 50 ppm/°C

0.25 to < 0.5

± 2.0 %

0.1 to < 0.25

± 5.0 %

RESISTANCE

RANGE (

Ω)

TIGHTEST

TOLERANCE

TYPICAL

MAXIMUM

10 to 500

± 0.01 %

± 2 ppm/°C

± 5 ppm/°C

5 to < 10

± 0.02 %

± 6 ppm/°C

2 to < 5

± 0.05 %

± 8 ppm/°C

1 to < 2

± 0.1 %

± 10 ppm/°C

0.5 to < 1

± 0.25 %

± 15 ppm/°C

0.25 to < 0.5

± 0.5 %

± 20 ppm/°C

0.1 to < 0.25

± 1.0 %

± 25 ppm/°C

0.05 to < 0.1

± 2.0 %

± 30 ppm/°C