General Note
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 going to print. A subsidiary of
TT electronics plc
• 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
PW Series
• 0.10Ω to 30KΩ
• 2 watts to 25 watts
• ±10% or ±5% tolerance
• TC’s from 300 ppm/°C to +5500 ppm/°C
• Lead free, RoHS compliant construction available
General Purpose Axial Leaded
Power Wirewound Resistor
IRC
Type
Power Rating
@ 25°C
(watts)
Standard
Resistance
Range
(ohms)
Standard Temperature
Coefficient Special Temperature Coefficients
+0.06%/°C
over R range
+0.03%/°C
over R range
+0.55%/°C
over R range
+0.45%/°C
over R range
+0.25%/°C
over R range
PW-2 2 0.15 to 2.4K 0.15 to 0.99 1.0 to 2.4K 0.1 to 30 0.24 to 130 1.0 to 10
PW-3 3 0.1 to 7.5K 0.1 to 0.99 1.0 to 7.5K 0.1 to 86 0.1 to 270 0.24 to 20
PW-5 5 0.1 to 8.5K 0.1 to 0.99 1.0 to 8.5K 0.1 to 68 0.1 to 300 0.27 to 22
PW-7 7 0.1 to 18K 0.1 to 0.99 1.0 to 18K 0.1 to 150 0.15 to 680 1.0 to 51
PW-10 10 0.18 to 30K 0.18 to 0.99 1.0 to 30K 0.1 to 240 0.24 to 1100 1.0 to 82
PW-15 15 0.18 to 30K 0.18 to 0.99 1.0 to 30K 0.1 to 240 0.24 to 1100 1.0 to 82
PW-18 18 0.18 to 22K 0.18 to 0.99 1.0 to 22K 0.1 to 200 0.24 to 1100 1.0 to 70
PW-22 22 0.27 to 18K 0.27 to 1.3 1.5 to 12K 0.15 to 360 0.36 to 1800 1.0 to 120
PW-25 25 0.27 to 18K 0.27 to 1.3 1.5 to 10K 0.15 to 300 0.36 to 1200 1.5 to 100
Electrical Data
Fireproof high
temperature ceramic
case- stand offs
optional
Alloy resistance
wire on fiberglass
substrate
Inorganic
fireproof
encapsulant
Automatically
clamped termination
lead assembly
PW Series Issue December 2008 Sheet 1 of 3
• 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
General Purpose Axial Leaded
Power Wirewound Resistor
Physical Data
IRC
Type L ±0.03 (0.8) W ±0.03 (0.8) H ±0.03 (0.8) D Dia. ±0.002 E ±0.03 (0.8) LL min. F (ref.)
PW-2 0.69 (17.5) 0.25 (6.35) 0.25 (6.35) 0.032 (0.8) 0.31 (7.87) 1.44 (36.6) 0.063
PW-3 0.88 (22.4) 0.31 (7.87) 0.31 (7.87) 0.036 (0.91) 0.38 (9.65) 1.44 (36.6) 0.063
PW-5 0.88 (22.4) 0.38 (9.65) 0.35 (8.89) 0.036 (0.91) 0.41 (10.4) 1.50 (38.1) 0.063
PW-7 1.39 (35.3) 0.38 (9.65) 0.35 (8.89) 0.036 (0.91) 0.47 (11.9) 1.50 (38.1) 0.125
PW-10 1.88 (47.8) 0.38 (9.65) 0.35 (8.89) 0.036 (0.91) 0.47 (11.9) 1.50 (38.1) 0.125
PW-15 1.88 (47.8) 0.50 (12.7) 0.50 (12.7) 0.036 (0.91) 0.63 (16.0) 1.50 (38.1) 0.125
PW-18 1.88 (47.8) 0.50 (12.7) 0.50 (12.7) 0.036 (0.91) 0.63 (16.0) 1.50 (38.1) 0.125
PW-22 2.50 (63.5) 0.50 (12.7) 0.50 (12.7) 0.040 (1.0)* 0.63 (16.0) 1.50 (38.1) 0.125
PW-25 2.50 (63.5) 0.50 (12.7) 0.50 (12.7) 0.040 (1.0)* 0.63 (16.0) 1.50 (38.1) 0.125
* Copper Clad Steel
Standard Configuration
L
D
LL
0.125” Max.
H
W
Alternate Configuration
E
F
PW Series Issue December 2008 Sheet 2 of 3
• 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
General Purpose Axial Leaded
Power Wirewound Resistor
Power Derating Curve
100
80
60
40
0 50 100 150 200 250
Ambient Temperature
20
0
85
PW - 3, 5, 7, 10
25 40
PW - 2
PW - 15, 18, 22, 25
Percent of Rated Load
Temperature Rise Chart
300
250
200
00 20 40 60 80 100 120
Temperature Rise (°C)
150
100
50
PW - 15, 18
PW - 10
PW - 7
PW - 5
PW - 3
Percent of Rated Load
PW - 22, 25
Sample Part No.
IRC Type
Resistance Value
(standard EIA values)
Tolerance
J = 5%, K = 10%
RoHS Indicator
LF indicated RoHS compliance
Ordering Data
PW15 1202 K LF
PW Series Issue December 2008 Sheet 3 of 3
