IRC Wire and Film Technologies Division

General Note

A subsidiary of

TT electronics plc

W20 Series Issue November 2006

IRC reserves the right to make changes in product specification without notice or liability.

All information is subject to IRC’s own data and is considered accurate at time of printing.

© IRC Wire and Film Technologies Division

Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com

• 736 Greenway Road Boone, North Carolina 28607-1860

Environmental Performance

Test

Maximum

Typical

Load at commercial rating: 1000 Hours at room temperature

∆R%

54

Dry heat: 1000 hours at 200°C

∆R%

2

1

Shelf life: 12 months at room temperature

∆R%

0.03

0.02

Short term overload

∆R%

1.0

0.2

Climatic

∆R%

0.5

0.2

Long term damp heat

∆R%

0.05

0.02

Temperature rapid change

∆R%

0.5

0.2

Resistance to solder heat

∆R%

0.25

0.03

Vibration and bump

∆R%

0.25

0.05

Noise (in a decade of frequency)

µV/V

zero

zero

Insulation resistance

Ω

>0.1G

Ω

>0.1G

Ω

Dielectric withstanding voltage

V

500 min.

500 min.

Operating temperature range

°C

-55 to +200

Construction

A high purity ceramic substrate is assembled with

interference-fit end caps, to which are welded the

termination wires. The resistive element is wound

on the substrate and welded to the caps, and the

vitreous enamel protective coating is then applied.

Terminations

Copper-clad steel wire, nickel-plated and

solder-coated.

Marking

The resistors are legend-marked with type

reference, resistance value and tolerance.

Solvent resistance

The body protection and marking are resistant to

all normal industrial cleaning solvents suitable for

printed circuits.

Dissipation (watts)

0

5

10

15

20

p

400

300

200

100

W21

W215

W22

W23

W24

Temperature Rise Curve

bn802 W20 Series Datasheet_2.ind2 2

bn802 W20 Series Datasheet_2.ind2 2

11/17/06 4:40:30 PM

11/17/06 4:40:30 PM