PW SERIES
GENERAL PURPOSE AXIAL LEADED
POWER WIREWOUND RESISTOR
Fireproof high
temperature ceramic
case - stand offs
optional
Alloy resistance
wire on fiberglass
substrate
•
•
•
•
•
2 watts to 25 watts
0.10 ohms to 30K ohms
±10% or ±5% tolerance
TC's from 300 ppm/°C to +5500 ppm/°C
Inorganic
fireproof
encapsulant
Automatically
clamped termination
lead assembly
Lead-/free, ROHS Compliant Construction Available
SPECIFICATIONS:
Power Rating
@ 25°C
IRC Type
PW-2
PW-3
PW-5
PW-7
PW-10
PW-15
PW-18
PW-22
PW-25
PW DIMENSIONS
IRC Type
PW-2
PW-3
PW-5
PW-7
PW-10
PW-15
PW-18
PW-22
PW-25
*Copper Clad Steel
Standard
Resistance
Standard Temperature
Coefficient
0.06%/°C
0.03%/°C
over R range
1.0 to 2.4K
1.0 to 7.5K1.0
to 8.5K
1.0 to 18K
1.0 to 30K
1.0 to 30K
1.0 to 22K
1.5 to 12K
1.5 to 10K
D Dia.±0.002
0.032 (0.8)
0.036 (0.91)
0.036 (0.91)
0.036 (0.91)
0.036 (0.91)
0.036 (0.91)
0.036 (0.91)
0.040 (1.0)*
0.040 (1.0)*
Special Temperature Coefficients
+0.55%/°C
over R range
0.1 to 30
0.1 to 86
0.1 to 68
0.1 to 150
0.1 to 240
0.1 to 240
0.1 to 200
0.15 to 360
0.15 to 300
E±0.03 (0.8)
0.31 (7.87)
0.38 (9.65)
0.41 (10.4)
0.47 (11.9)
0.47 (11.9)
0.63 (16.0)
0.63 (16.0)
0.63 (16.0)
0.63 (16.0)
+0.45%/°C
over R range
0.24 to 130
0.1 to 270
0.1 to 300
0.15 to 680
0.24 to 1100
0.24 to 1100
0.24 to 1100
0.36 to 1800
0.36 to 1200
LL min.
1.44 (36.6)
1.44 (36.6)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
+0.25%/°C
over R range
1.0 to 10
0.24 to 20
0.27 to 22
1.0 to 51
1.0 to 82
1.0 to 82
1.0 to 70
1.0 to 120
1.5 to 100
F (ref.)
0.063
0.063
0.063
0.125
0.125
0.125
0.125
0.125
0.125
(watts)
2
3
5
7
10
15
18
22
25
Range (ohms) over R range
0.15 to 2.4K
0.15 to 0.99
0.1 to 7.5K
0.1 to 0.99
0.1 to 8.5K
0.1 to 0.99
0.1 to 18K
0.1 to 0.99
0.18 to 30K
0.18 to 0.99
0.18 to 30K
0.18 to 0.99
0.18 to 22K
0.27 to 18K
0.27 to 18K
0.18 to 0.99
0.27 to 1.3
0.27 to 1.3
H±0.03 (0.8)
0.25 (6.35)
0.31 (7.87)
0.35(8.89)
0.35(8.89)
0.35(8.89)
0.50 (12.7)
0.50 (12.7)
0.50 (12.7)
0.50 (12.7)
Please note: When ordering the alternate configuration please add an 'A' after the part number. (i.e., PW-2A)
(Inches and (mm)):
L±0.03 (0.8) W±0.03 (0.8)
0.69 (17.5)
0.25 (6.35)
0.88 (22.4)
0.31 (7.87)
0.88 (22.4)
1.39 (35.3)
1.88 (47.8)
1.88 (47.8)
1.88 (47.8)
2.50 (63.5)
2.50 (63.5)
0.38 (9.65)
0.38 (9.65)
0.38 (9.65)
0.50 (12.7)
0.50 (12.7)
0.50 (12.7)
0.50 (12.7)
Standard
Alternate
Configuration
POWER DERATING:
TEMPERATURE RISE:
Temperature Rise (°C)
Percent of Rated Load
Ambient Temperature (°C)
Percent of Rated Load
General Note
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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 elec
Issue Preliminary
PW SERIES
GENERAL PURPOSE RADIAL TERMINAL
POWER WIREWOUND RESISTOR
•
•
•
•
•
20 watts to 50 watts
0.10 ohms to 2.0K ohms
±10% or ±5% tolerance
Custom parts available - consult factory
RoHS-compliant version available
Inorganic
fireproof
encapsulant
Tinned steel
Steatite
ceramic case
Allow resistance wire on
fiberglass substrate
SPECIFICATIONS:
Power at
25°C
IRC Type
PW-20E
PW-30
PW-40
PW-50E
(watts)
20
30
40
50
Resistance
Range
(ohms)
0.1 - 2.0K
0.5 - 1.2K
0.65 - 1.5K
0.08 - 1.8K
TEMPERATURE RISE at
(without bracket)
POWER DERATING:
Percent of Rated Load
- 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.
Temperature Rise (°C)
Ambient Temperature (°C)
Percent of Rated Load
With Bracket:
PW-30 Increased to 40 watts
PW-40 Increased to 50 watts
PW-50 Increased to 60 watts
DIMENSIONS
(Inches):
PW-20E Wirewound
5/32 Dia. Thru (2)
0.250 (Typ.)
PW-30, 40 and 50E Wirewound
A
0.032±0.0025
0.282±0.020
0.032±0.0025
A
0.157±0.020
5/32 Dia. Thru (2)
0.75±0.030
0.25
0.5±0.030
B
0.5±0.030
0.75±0.030
0.875
7/32 Dia.
0.375
0.75
B
PW-20E Alternate
Terminal
Configuration
-
0.020" Tin coated
Steel
IRC Type
PW-20E
PW-30
PW-40
PW-50E
General Note
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
Printed Circuit Terminal
A (±0.030)
1.875
2.00
2.45
3.075
B (±0.060)
2.50
2.55
3.00
3.625
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.
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
A subsidiary of
TT elec
Issue Preliminary
HOW TO ORDER:
Sample Part No.
PW
18
12K
10%
LF
IRC Type
Power
18 = 18watts
Resistance Value
(standard EIA values)
Tolerance
±10 or ±5% standard
Lead Free Construction
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.
WIREWOUND AND FILM TECHNOLOGIES DIVISION
A subsidiary of TT electronics plc
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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