Y0065321R00T0L【PDF 1/6 页】RES 321 OHM 3W .01% FOIL RAD

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VHP-3, VHP-4, VPR247

Vishay Foil Resistors

Bulk Metal ? Foil Technology

Hermetically Sealed Power and Current Sensing Resistor with

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

FEATURES

? Temperature coefficient of resistance TCR:

± 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)

P b -free

A v aila b le

RoHS*

COMPLIANT

? 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 k Ω

Any value available within resistance range

Vishay Bulk Metal ? Foil power resistors offer the best

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

? 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

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.

? Terminal finishes available:

VHP-3 and VHP-4:

VPR247:

lead (Pb)-free

tin/lead alloy

gold plated

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

TABLE 1 - VHP-3 1) SPECIFICATIONS

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

? Prototype samples available from 48 h. For more

information, please contact foil@vishaypg.com

? For better performances, please contact Application

Engineering

TABLE 2 - VHP-4 AND VPR247 SPECIFICATIONS 1), 2)

RESISTANCE

RANGE ( Ω )

50 to 80K

25 to < 50

10 to < 25

5 to < 10

2 to < 5

1 to < 2

TIGHTEST

TOLERANCE

± 0.01 %

± 0.02 %

± 0.05 %

± 0.1 %

± 0.25 %

± 0.5 %

TYPICAL

TCR 3), 4)

± 2 ppm/°C

MAXIMUM

TCR 3)

± 5 ppm/°C

± 7 ppm/°C

± 10 ppm/°C

± 13 ppm/°C

± 20 ppm/°C

± 25 ppm/°C

RESISTANCE

RANGE ( Ω )

10 to 500

5 to < 10

2 to < 5

1 to < 2

0.5 to < 1

0.25 to < 0.5

0.1 to < 0.25

TIGHTEST

TOLERANCE

± 0.01 %

± 0.02 %

± 0.05 %

± 0.1 %

± 0.25 %

± 0.5 %

± 1.0 %

TYPICAL

TCR 3), 4)

± 2 ppm/°C

MAXIMUM

TCR 3)

± 5 ppm/°C

± 6 ppm/°C

± 8 ppm/°C

± 10 ppm/°C

± 15 ppm/°C

± 20 ppm/°C

± 25 ppm/°C

0.5 to < 1

± 1.0 %

0.05 to < 0.1

± 2.0 %

± 30 ppm/°C

0.25 to < 0.5

0.1 to < 0.25

± 2.0 %

± 5.0 %

± 50 ppm/°C

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

Document Number: 63005

Revision: 23-Mar-10

For any questions, contact: foil@vishaypg.com

www.foilresistors.com

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