www.vishay.com

Document Number: 20128

176

Revision: 26-May-10

WK/WR

Vishay Draloric

High Power Metal Oxide Leaded Resistors

FEATURES

• Rugged metal oxide film

• High power dissipation in small size (1 W/0207

size to 4 W/0922 size)

• High temperature coating (up to 200 °C),

non-flammable

• Lead (Pb)-free solder contacts

• Pure tin plating provides compatibility with lead (Pb)-free

and lead containing soldering processes

• Compliant to RoHS directive 2002/95/EC

Notes

• Coating: Green

• Marking: WK2 and WR4 have color code band marking. TCR band will be given to only WK2, 100 ppm, 5 %. WR5 and WK8 are printed marked.

Notes

STANDARD ELECTRICAL SPECIFICATIONS

MODEL

SIZE

RATED DISSIPATION

W

LIMITING ELEMENT

VOLTAGE

V

≅

TEMPERATURE

COEFFICIENT

ppm/K

TOLERANCE

%

RESISTANCE

RANGE

E-SERIES

WK2

0207

1.0

500

± 50

± 1

4.7

Ω to 1 MΩ

E24, E96

WK2

0207

1.0

500

± 100

± 2

± 5

4.7

Ω to 1 MΩ

4.7

Ω to 1 MΩ

E24, E48

E24

WK2

0207

1.0

500

± 200

± 5

0.22

Ω to 1 MΩ

E24

WR4

0414

2.0

500

± 200

± 2

± 5

1

Ω to 1 MΩ

0.33

Ω to 1 MΩ

E24, E48

E24

WR5

0617

3.0

750

± 200

± 2

± 5

1

Ω to 100 kΩ

0.22

Ω to 560 kΩ

E24, E48

E24

WK8

0922

4.0

750

± 200

± 2

± 5

1

Ω to 68 kΩ

0.22

Ω to 100 kΩ

E24, E48

E24

TECHNICAL SPECIFICATIONS

PARAMETER

UNIT

WK2

WR4

WR5

WK8

Rated Dissipation,

W

1.0

2.0

3.0

4.0

Limiting Element Voltage,

V

≅

500

500

750

750

Insulation Voltage,

V

> 500

> 500

> 500

> 500

Thermal Resistance,

K/W

≤ 140

≤ 100

≤ 70

≤ 60

Insulation Resistance

Ω

°C

- 55 to + 200

Failure Rate

< 1

Weight

g

0.2

0.7

1.5

3.5

P x R