UAL5-20KF8

UAL Series Aluminum Housed Power Wirewound Resistors UAL-25-4T UAL-25-4 • • • • • • • • Power Rating 5 to 300Watts High Temperature: -55°C to +275°C Excellent Pulse Handling Resistances from 0.01 to 250k Ohms Tolerance to ±0.01% Low TCR: ± 20ppm/K Standard Various Terminal Option Available All Welded Construction UAL-25-4TR SPECIFICATIONS Type MIL-R-39009 MIL-R-18546 Style Commercial MIL Free Air UAL-5 RER-60 / RE-60 7.5 a 5a 4.5 0.01 to 22K UAL-10 RER-65 / RE-65 10 a 10 a 7.5 0.01 to 47K UAL-25 RER-70 / RE-70 25 b 20 b 12 0.01 to 90K UAL-50 RER-75 / RE-75 50 c 30 c 20 0.01 to 250K 100 d 75 d 40 0.01 to 70K UAL-100² Power Rating ( W @ 25°C ) Resistance Range1 UAL-180² - 180 d - - 0.01 to 50K UAL-250² RER-80 / RE-80 250 d 120 d 100 0.01 to 50K UAL-300² - 300 e - 75 0.01 to 68K For non-inductive windings, divide maximum resistance by 2 E-24 / E-96, check with factory on availability of other values a Heatsink Required : 0.040 [1.0] Alum. Plate, 129 in2 [832 cm2] or equiv. b Heatsink Required : 0.040 [1.0] Alum. Plate, 167 in2 [1077 cm2] or equiv. c Heatsink Required : 0.059 [1.5] Alum. Plate, 291 in2 [1877 cm2] or equiv. d Heatsink Required : 0.125 [3.2] Alum. Plate, 294 in2 [1896 cm2] or equiv. e Heatsink Required : 0.125 [3.2] Alum. Plate, 895 in2 [5780 cm2] or equiv. 1 2 Ordering Information For Non-Inductive Windings / insert the letter “N” ( i.e. UALN-25 ) Part Description: Part Type - Resistance - Tolerance - TCR ( If not standard ) Example: UAL-25 10 Ohm 1% Riedon Inc. © Riedon, Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 www.riedon.com sales@riedon.com (626) 284-1704 Revised: 201812_005 UAL Series Aluminum Housed Power Wirewound Resistors SPECIFICATIONS (continued) Specification Value Tolerances ±0.01% to ±10% ( 1% Standard ) Temperature Coefficient >10W : ±20ppm/K 1W to10W : ±50ppm/K