• 4222 South Staples Street • Corpus Christi Texas 78411 USA

Wire and Film Technologies Division

Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com

Molded Surface Mount

Wirewound Resistor

*Note: The power ratings to be applied depend upon the board used and the ambient temperature.

Sample Part No.

IRC Type

(WSM1, WSM2, WSM3)

Resistance Value

(100

Ω and greater - First 3 significant digits plus

4th digit multiplier) Example: 100

Ω = 1000, 1000Ω = 1001,

150,000

Ω = 1503 (Less than 100Ω - "R" is used to designate

decimal) Example: 51

Ω = 51R0, 1Ω = 1R00, 0.25Ω = R250

Tolerance

(K = 10%, J = 5%, G = 2%, F = 1%)

Lead Free, RoHS Designator

Packaging Code

(TR = 13" Reel)

Ordering Data

WSM3

6801

F

LF

TR

Specify type, reference, etc. as indicated in this example of a

WSM3 6801 F resistor with tape and reel packaging.

Standard Quantities Per Package

Type

Code

WSM1

WSM2

WSM3

13" Reel

(330mm)

R

1500

800

750

Packaging:

WSM2 resistors are supplied on .945 (24mm) wide

carrier tape.

WSM3 resistors are supplied on 1.26 (32mm) wide

carrier tape.

Both products are reeled onto 13.00 (330mm)

diameter reels.

*For packaging information, see Appendix "A".

Environmental Data

Characteristics

WSM-1

WSM-2

WSM-1

Load at Rated Power: 1000 hours @ 70°C

2 ± 0.001

Ω

2 ± 0.001

Ω

3 ± 0.001

Ω

Dry Heat:

1000 hours @ 155°C

2 ± 0.001

Ω

2 ± 0.001

Ω

3 ± 0.001

Ω

Short Term Overload

2 ± 0.001

Ω

Derating from Rated Power @ 70°C

zero at 155°C

Moisture

1 ± 0.001

Ω

1 ± 0.001

Ω

1.5 ± 0.001

Ω

Temperature Cycling

1 ± 0.001

Ω

Resistance to Solder Heat

1 ± 0.001

Ω

Isolation Voltage

1,000

Insulation Resistance

>1000M

Substrate Bend

0.2 ± 0.001

Ω

∆R%

volts

ohms

∆R%

∆R%

∆R%

∆R%

∆R%

∆R%

Dimensions (Inches and (mm))

Ao

Bo

Ko

W

P

T

WSM1

.165

(4.2)

.300

(7.62)

.165

(4.20)

.630

(16.0)

.315

(8.00)

.014

(0.36)

WSM2

.266

(6.75)

.470

(11.95)

.206

(5.22)

.945

(24.0)

.473

(12.0)

.014

(0.36)

WSM3

.288

(7.3)

.721

(18.3)

.264

(6.7)

1.26

(32.0)

.473

(12.0)

.016

(0.4)

P

W

t

WSM Series Issue December 2008 Sheet 3 of 3