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** MIL Equivalent Resistance (ohms) Power Rating @25°C (watts) IRC/SX MIL Min. Max. Max. MIL AL-5 RE-60G 7.5 5 0.1 16K 3.32K AL-10 RE-65G 12.5 10 0.1 25K 5.62K AL-25 RE-70G 25.0 20 0.1 55K 12.1K AL-50 RE-75G 50.0 30 0.1 180K 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 and tolerance ranges; contact factory. 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 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 C M L N E F B K H A D G Dimensions (inches and (mm)) Style A B C D E F G H J K L M N ±0.005 ±0.005 ±0.031 ±0.062 ±0.015 ±0.015 ±0.015 ±0.010 ±0.010 ±0.010 ±0.005 ±0.015 ±0.005 (metric) ±0.1 ±0.1 ±0.8 ±1.6 ±0.4 ±0.4 ±0.4 ±0.25 ±0.25 ±0.25 ±0.1 ±0.4 ±0.1 AL-5 0.444 0.490 0.600 1.035 0.334 0.646 0.320 0.065 0.140 0.078 0.093 0.078 0.050 (11.28) (12.45) (15.24) (28.58) (8.48) (16.41) (8.13) (1.65) (3.56) (1.98) (2.36) (1.98) (1.27) 0.562 0.625 0.750 1.375 0.430 0.800 0.400 0.075 0.190 0.093 0.093 0.102 0.086 (14.27) (15.88) (19.1) (34.93) (10.92) (20.3) (10.2) (1.91) (4.83) (2.4) (2.4) (2.59) (2.18) Tol. AL-10 AL-25 AL-50 0.719 0.781 1.062 1.938 0.530 1.080 0.560 0.085 0.260 0.172 0.125 0.115 0.086 (18.26) (19.84) (26.97) (49.23) (13.46) (27.43) (14.22) (2.16) (6.6) (4.37) (3.18) (2.92) (2.18) 1.563 0.844 1.968 2.781 0.615 1.140 0.615 0.085 0.300 0.196 0.125 0.107 0.086 (39.7) (21.44) (49.99) (70.64) (15.62) (28.96) (15.62) (2.16) (7.62) (4.97) (3.18) (2.71) (2.18) Power Derating Curve Ordering Data 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." Sample Part No. 120 AL - 10 10RD F LF IRC Type Percent of Power Rating AL 100 Power Aluminum Chassis 10, 25, 50 80 Range A 60 Tolerance 40 B J = ±5%; F = ±1%; D = ±0.5%; B = ±0.1% C Lead Free Construction 20 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