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Chassis Mounted Power Wirewound Resistor
AL Series
* * * * * * 1% tolerance 5 watts to 50 watts 0.1 ohm to 180K ohm* Non-inductive winding available High thermal conductivity cores available Lead Free RoHS Compliant Construction
*Values down to .01 ohms available. Contact factory with special applications.
Electrical Data
IRC/SX Style** AL-5 AL-10 AL-25 AL-50 MIL Equivalent RE-60G RE-65G RE-70G RE-75G Power Rating @25C (watts) IRC/SX 7.5 12.5 25.0 50.0 MIL 5 10 20 30 Min. 0.1 0.1 0.1 0.1 Resistance (ohms) Max. 16K 25K 55K 180K Max. MIL 3.32K 5.62K 12.1K 39.2K
*All resistors have an operating temperature range of -55C to +275C. 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 and tolerance ranges; contact factory.
Power Rating: 5 to 50 watts depending upon style. 275C maximum hotspot at 25C 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
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 AL Series Issue August 2008 Sheet 1 of 2
Chassis Mounted Power Wirewound Resistor
Physical Data
J M
C L N
E
F
B
H G
K
A
D
Dimensions (inches and (mm))
Style Tol. (metric) AL-5 A 0.005 0.1 0.444 (11.28) AL-10 0.562 (14.27) 0.719 (18.26) 1.563 (39.7) 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) N 0.005 0.1 0.050 (1.27) 0.086 (2.18) 0.086 (2.18) 0.086 (2.18)
AL-25
AL-50
Power Derating Curve
AL resistors are rated to operate with a 275C maximum hotspot under full rated power at 25C ambient. They must be derated for higher ambient temperature per "Wattage vs. Ambient Temperature Derating Curve."
120
Ordering Data
Sample Part No. IRC Type
AL
AL - 10
10RD
F
LF
Percent of Power Rating
100
Aluminum Chassis
80 60
Power
10, 25, 50
A
Range Tolerance
J = 5%; F = 1%; D = 0.5%; B = 0.1%
40
B C
20
Lead Free Construction
0
25
75
125
175
225
275
325
Ambient Temperature (C)
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
AL Series Issue August 2008 Sheet 2 of 2

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