A subsidiary of
TT elec
Issue Preliminary
• 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
• Lead-/free, ROHS Compliant Construction Available Automatically
clamped termination
lead assembly
Fireproof high
temperature ceramic
case - stand offs
optional
Alloy resistance
wire on fiberglass
substrate
POWER DERATING:
Percent of Rated Load
Ambient Temperature (°C)
TEMPERATURE RISE:
Temperature Rise (°C)
Percent of Rated Load
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)*
IRC Type
PW-2
PW-3
PW-5
PW-7
PW-10
PW-15
PW-18
PW-22
PW-25
PW DIMENSIONS (Inches and (mm)):
L±0.03 (0.8)
0.69 (17.5)
0.88 (22.4)
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)
W±0.03 (0.8)
0.25 (6.35)
0.31 (7.87)
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)
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)
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)
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)
F (ref.)
0.063
0.063
0.063
0.125
0.125
0.125
0.125
0.125
0.125
*Copper Clad Steel Alternate
Configuration
Standard
Inorganic
fireproof
encapsulant
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.
PW SERIES
GENERAL PURPOSE AXIAL LEADED
POWER WIREWOUND RESISTOR
IRC Type
PW-2
PW-3
PW-5
PW-7
PW-10
PW-15
PW-18
PW-22
PW-25
SPECIFICATIONS:
Power Rating
@ 25°C
(watts)
2
3
5
7
10
15
18
22
25
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
+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
+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
+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
Standard Temperature
Coefficient Special Temperature Coefficients
Standard
Resistance
Range (ohms)
0.15 to 2.4K
0.1 to 7.5K
0.1 to 8.5K
0.1 to 18K
0.18 to 30K
0.18 to 30K
0.18 to 22K
0.27 to 18K
0.27 to 18K
0.06%/°C
over R range
0.15 to 0.99
0.1 to 0.99
0.1 to 0.99
0.1 to 0.99
0.18 to 0.99
0.18 to 0.99
0.18 to 0.99
0.27 to 1.3
0.27 to 1.3
Please note: When ordering the alternate configuration please add an 'A' after the part number. (i.e., PW-2A)
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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 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
Allow resistance wire on
fiberglass substrate
Inorganic
fireproof
encapsulant
Tinned steel
Steatite
ceramic case
B (±0.060)
2.50
2.55
3.00
3.625
A (±0.030)
1.875
2.00
2.45
3.075
Resistance
Range
(ohms)
0.1 - 2.0K
0.5 - 1.2K
0.65 - 1.5K
0.08 - 1.8K
IRC Type
PW-20E
PW-30
PW-40
PW-50E
SPECIFICATIONS:
Power at
25°C
(watts)
20
30
40
50
- 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 at POWER DERATING:
(without bracket)
Percent of Rated Load
Percent of Rated Load
Temperature Rise (°C)
Ambient Temperature (°C)
With Bracket:
PW-30 Increased to 40 watts
PW-40 Increased to 50 watts
PW-50 Increased to 60 watts
DIMENSIONS (Inches):
PW-30, 40 and 50E WirewoundPW-20E Wirewound
PW-20E Alternate
Terminal
Configuration
- 0.020" Tin coated
Steel Printed Circuit Terminal
0.5±0.030
0.5±0.030
0.157±0.020
5/32 Dia. Thru (2) 0.250 (Typ.)
0.032±0.0025
B
B
A
A
0.032±0.0025
0.25
0.375
0.75
7/32 Dia.
0.875
0.75±0.030
0.75±0.030
5/32 Dia. Thru (2)
0.282±0.020
0.205 or
0.187±0.005
0.25±0.031
0.069±0.005
0.125±0.015 0.200 (Typ.)
0.135±0.015
IRC Type
PW-20E
PW-30
PW-40
PW-50E
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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
