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
Issue Preliminary
0106
CHASSIS MOUNTED POWER
WIREWOUND RESISTOR
• 0.1 ohm to 180K ohm∗
• 5 watts to 50 watts
• ±1% tolerance
• Non-inductive winding available
• High thermal conductivity cores available
• Lead Free ROHS Compliant Construction
Molded and welded
construction
Top surface marked
Complete
protection against
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
∗Values down to .01 ohms available. Contact factory with special applications.
Screw mounts
on chasis
Power Rating:
5 to 50 watts depending upon style. 275°C maximum hotspot at 25°C ambient.
Conforms to MIL-R-18546. 1% maximum ∆R in 1000 hour load life. Proper
heat sinks are as follows:
4 X 5 X 2 X 0.040 aluminum chassis - AL-5 and AL-10
5 X 7 X 2 X 0.040 aluminum chassis - AL-25 and AL-50
Construction:
Windings are "controlled stress" wound on ground ceramic cores. Terminations
are of welded construction. Terminals are electronically welded to the end
caps for maximum strength and electrical continuity. A high temp. silicone
encapsulation is used to mold the wound assembly within the anodized
Standard Temperature Coefficient of Resistance:
<1 ohm = ±90 ppm
≥1 ohm to <10 ohms = ±50 ppm
≥10 ohm = ±20 ppm
A
±0.005
±0.1
0.444
(11.28)
0.562
(14.27)
0.719
(18.26)
1.563
(39.7)
Style
Tol.
(metric)
AL-5
AL-10
AL-25
AL-50
N
±0.005
±0.1
0.050
(1.27)
0.086
(2.18)
0.086
(2.18)
0.086
(2.18)
DIMENSIONS (Inches and (mm)):
B
±0.005
±0.1
0.490
(12.45)
0.625
(15.88)
0.781
(19.84)
0.844
(21.44)
C
±0.031
±0.8
0.600
(15.24)
0.750
(19.1)
1.062
(26.97)
1.968
(49.99)
D
±0.062
±1.6
1.035
(28.58)
1.375
(34.93)
1.938
(49.23)
2.781
(70.64)
E
±0.015
±0.4
0.334
(8.48)
0.430
(10.92)
0.530
(13.46)
0.615
(15.62)
F
±0.015
±0.4
0.646
(16.41)
0.800
(20.3)
1.080
(27.43)
1.140
(28.96)
G
±0.015
±0.4
0.320
(8.13)
0.400
(10.2)
0.560
(14.22)
0.615
(15.62)
H
±0.010
±0.25
0.065
(1.65)
0.075
(1.91)
0.085
(2.16)
0.085
(2.16)
J
±0.010
±0.25
0.140
(3.56)
0.190
(4.83)
0.260
(6.6)
0.300
(7.62)
K
±0.010
±0.25
0.078
(1.98)
0.093
(2.4)
0.172
(4.37)
0.196
(4.97)
L
±0.005
±0.1
0.093
(2.36)
0.093
(2.4)
0.125
(3.18)
0.125
(3.18)
M
±0.015
±0.4
0.078
(1.98)
0.102
(2.59)
0.115
(2.92)
0.107
(2.71)
IRC/SX
Style**
AL-5
AL-10
AL-25
AL-50
SPECIFICATIONS:
Resistance
(ohms)
Power Rating
@ 25°C(watts)
MIL
Equiv.
RE-60G
RE-65G
RE-70G
RE-75G
IRC/SX
7.5
12.5
25.0
50.0
MIL
5
10
20
30
Min.
0.1
0.1
0.1
0.1
Max.
16K
25K
55K
180K
Max.
MIL
3.32K
5.62K
12.1K
39.2K
*All resistors have an operating temperature range of -55°C to +275°C. Derating is required
for reduced chassis mounting area and for high ambient temperatures.
**To order non-inductive styles add suffix N (e.g.:ALN-5). (Divide Max. Res. Values
by styles
available with extended resistance & tolerance ranges; contact factory.
Ambient Temperature (°C)
Percent of Rated Power
DERATING:
AL resistors are rated to operate with a 275°C
maximum hotspot under full rated power at
25°C ambient. They must be derated for higher
ambient temperature per "Wattage vs. Ambient
Temperature Derating Curve."
AL SERIES
HOW TO ORDER:
Sample Part No.:
AL 10 12K 0.010% LF
Type
Power
Range
Tolerance
Lead Free Construction
