General Purpose
Radial Terminal
Power Wirewound Resistor
PW Radial Series
•
•
•
•
•
0.10Ω to 2.0KΩ
20 watts to 50 watts
±10% or ±5% tolerance
RoHS compliant construction available
Custom parts available - consult factory
Inorganic
fireproof
encapsulant
Tinned steel
Steatite
ceramic case
Alloy resistance wire on
fiberglass substrate
Electrical Data
IRC
Type
PW-20E
PW-30
PW-40
PW-50E
- Flameproof inorganic construction
- EIA RS-344, insulated fixed wirewound resistors
- 1000 hour load life at 25°C: 5% max.
- Moisture no load 240 hours: 2% max.
- Temperature cycling (5 cyc.): 5% max.
Power Rating @ 25°C
(watts)
20
30
40
50
Resistance
Range (ohms)
0.1 to 2.0K
0.5 to 1.2K
0.65 to 1.5K
0.08 to 1.8K
Temperature Rise Chart
300
Temperature Rise (°C)
Power Derating Curve
100
Percent of Rated Load
80
60
40
20
0
PW - 20E, PW - 30, PW - 40
PW - 50E without Bracket
PW - 50E
PW - 20E
200
PW - 40
100
PW - 30
0
0
25
50
75
100
Percent of Rated Load
125
0
50
100
150
200
Ambient Temperature (°C)
With Bracket:
PW-30 Increased to 40 watts
PW-40 Increased to 50 watts
PW-50 Increased to 60 watts
250
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.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
PW Radial Series Issue December 2008 Sheet 1 of 2
General Purpose
Radial Terminal
Power Wirewound Resistor
Physical Data
PW-20E Wirewound
0.250 (Typ.)
5/32 Dia. Thru (2)
A
PW-30, 40 and 50E Wirewound
A
0.282±0.020
5/32 Dia. Thru (2)
0.032±0.0025
0.032±0.0025
0.157±0.020
0.5±0.030
0.75±0.030
0.25
B
0.5±0.030
0.75±0.030
0.375
0.875
0.75
7/32 Dia.
PW-20E Alternate
Terminal
Configuration
-0.020" Tin coated Steel
Printed Circuit Terminal
0.205 or
0.187±0.005
0.125±0.015
0.200 (Typ.)
0.25±0.031
0.069±0.005
0.135±0.015
Dimensions (Inches (mm))
IRC Type
PW-20E
PW-30
PW-40
PW-50E
A
1.875 ±0.030
2.00 ±0.030
2.45 ±0.030
3.075 ±0.030
B
2.5 ±0.060
2.55 ±0.060
3.00 ±0.060
3.625 ±0.060
Ordering Data
Sample Part No.
IRC Type
PW
18
1202
K
LF
PW20E, PW30, PW40, PW50E
Power
18 = 18 watts
Resistance Value
(standard EIA values)
Tolerance
±10% or ±5% standard
RoHS Indicator
LF indicates RoHS compliance
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
PW Radial Series Issue December 2008 Sheet 2 of 2
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