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VHZ Hermetic

Vishay Foil Resistors

Document Number: 63063

Revision 12-Dec-05

For technical questions, contact: foil@vishay.com

SALES

• AMERICAS: foilsales.usa@vishay.com

• ASIA/JAPAN: foilsales.asia@vishay.com

• UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com

• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com

• FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com

• ISRAEL: foilsales.israel@vishay.com

Bulk Metal

Hermetically Sealed Resistors, Aerospace

FEATURES

• VH102Z Series

Nominal Temperature Coefficient of Resistance:

± 0.2ppm/°C MIL Range (see table 2)

• VHZ555 Temperature Coefficient of Resistance:

± 2ppm/°C (– 55°C to + 125°C);

• Selected TCR Tracking: to 0.5ppm/°C (matched sets)

• Load-Life Stability: ± 0.0025% maximum ∆R at 0.1 watt,

+ 60°C, 2,000 hours (VHZ555)

• Power Rating: 0.6 Watts at + 70°C; 0.3 Watts at + 125°C

• Resistance Tolerance (Initial Resistance Accuracy):

± 0.005% tightest to ± 1.0% loosest

• Resistance Range:

VH102Z: 100R to 100K

VHZ555: 4R99 to 121K

The "VHZ" series of resistors is the hermetic version of

the molded "Z" series devices. Hermetic sealing eliminates

the ingress of both oxygen, which degrades resistors over

long periods, and moisture which degrades resistors more

quickly. These parts are made with glass to metal seal

enclosures employing Kovar eyelets which allow the copper

leads to pass through the enclosure to minimize the

thermal EMF from the lead junctions.

Rubber fill

between the metal housing and resistance element acts both

as a mechanical damper and thermal transfer path.

VH102Z is the hermetically-sealed counterpart of the Z201

high-performance molded resistors.

VHZ555 is the

hermetically-sealed version of the Z555, MIL style RNC90Z.

MODEL

RESISTANCE

STANDARD RESISTANCE MAXIMUM

AMBIENT

AVERAGE

DIMENSIONS

NUMBER

RANGE

WEIGHT

(

(GRAMS)

INCHES

mm

VH102Z

100R to 100K

± 0.005

± 1.0

W

0.185 Maximum

4.70 Maximum

± 1.0

L

0.435 Maximum

11.05 Maximum

± 1.0

300

0.6 W

0.3 W

1.4

H

0.430 Maximum** 10.92 Maximum

VHZ555

30.1 to 121K

± 0.005

± 1.0

LL

1 ± 0.125

25.4 ± 3.18

20 to < 30.1

± 0.01

± 1.0

LS

3.81 ± 0.25

4.99 to < 20

± 0.05

± 1.0

ST 0.095 Maximum

2.41 Maximum

LS

Model

Number

VISHAY

XXXX

VH102Z

ST

H

L

Date Code

W

Front View

Rear View

Lead Material #22 AWG

Round Solder Coated Copper

Resistance

Value Code

Tolerance

Serial No.

(Optional Marking)

100R01

0.01%

XXXX

10

Week

01

Year

LL

TABLE 1 - MODEL SELECTION

FIGURE 1 - STANDARD IMPRINTING AND DIMENSIONS

**0.375H available.

Product may not

be to scale