UAL Series Aluminum Housed Power Wirewound Resistors • 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-25-4T UAL-25-4 UAL-25-4TR SPECIFICATIONS MIL-R-39009 Power Rating ( W @ 25°C ) Resistance Type MIL-R-18546 Range1 Style Commercial MIL Free Air UAL-5 RER-60 / RE-60 7.5 a 5 a 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 UAL-100² 100 d 75 d 40 0.01 to 70K 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 1 For non-inductive windings, divide maximum resistance by 2 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. 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. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com 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 <1W : Call Factory Temperature Range -55°C to +275°C Dielectric Strength UAL-5,10: 1500 VAC ; UAL-25: 2500 VAC ; UAL-50: 3500VAC ; Others: 5500VAC Constuction Centerless ground ceramic core Matte Tin over Copper High-temperature epoxy molding Compound, UL94-V0 Anodized aluminum housing All welded terminations Environmental Performance DR (MIL-STD 202) Dielectric ±0.2% + 0.05W Load Life ±1% + 0.05W Storage ±0.2% + 0.05W Moisture Resistance ±0.2% + 0.05W Thermal Shock ±0.2% + 0.05W 5X Overload ( 5s ) ±0.2% + 0.05W Shock ±0.1% + 0.05W Vibration ±0.1% + 0.05W Optional Lead Configuation Wire, Flexible, Teflon, Quick Disconnect, Flying Leads, Formed *Call factory for quote Power Derating Curve 120 100 % ) 6800 A Mounted on Heatsink FABCr :e:: e UUU-aAAAirLLL ---D525e,50 rU,a UAtiAnLLg-1-0100, UAL-250 r ( B D : UAL-300 e w 40 C o P D 20 0 0 50 100 150 200 250 300 350 Ambient Temperature (°C) Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com Revised: 201812_005

UAL Series Aluminum Housed Power Wirewound Resistors A B C D E F G H J K L M N O P Q R Type ±0.005 ±0.005 ±0.031 ±0.120 ±0.015 ±0.015 ±0.015 ±0.010 ±0.010 ±0.010 ±0.005 ±0.015 ±0.006 ±0.120 ±0.031 ±0.002 ±0.031 [±0.13] [±0.13] [±0.8] [±3.10] [±0.4] [±0.4] [±0.4] [±0.25] [±0.25] [±0.25] [±0.13] [±0.4] [±0.15] [±3.10] [±0.8] [±0.05] [±0.8] 0.444 0.490 0.600 1.125 0.334 0.646 0.320 0.065 0.140 0.078 0.093 0.078 0.050 0.266 0.245 0.051 0.085 UAL-5 [11.3] [12.4] [15.2] [28.5] [8.5] [16.4] [8.1] [1.7] [3.6] [2.0] [2.4] [2.0] [1.3] [6.8] [6.2] [1.30] [2.2] 0.562 0.625 0.750 1.320 0.430 0.800 0.400 0.075 0.190 0.093 0.093 0.102 0.080 0.312 0.312 0.098 0.160 UAL-10 [14.3] [15.9] [19.1] [33.5] [10.9] [20.3] [10.2] [1.9] [4.8] [2.4] [2.4] [2.6] [2.0] [7.9] [7.9] [2.49] [4.0] 0.719 0.781 1.062 1.870 0.530 1.080 0.560 0.085 0.260 0.172 0.125 0.125 0.080 0.438 0.391 0.098 0.185 UAL-25 [18.3] [19.8] [27.0] [47.5] [13.5] [27.4] [14.2] [2.2] [6.6] [4.4] [3.2] [3.2] [2.0] [11.1] [9.9] [2.49] [4.7] 1.563 0.844 1.968 2.720 0.615 1.140 0.615 0.085 0.300 0.196 0.125 0.125 0.080 0.438 0.422 0.098 0.185 UAL-50 [39.7] [21.4] [50.0] [70.0] [15.6] [29.0] [15.6] [2.2] [7.6] [5.0] [3.2] [3.2] [2.0] [11.1] [10.7] [2.49] [4.7] Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com Revised: 201812_005

UAL Series Aluminum Housed Power Wirewound Resistors Dimensions (continued) A Aa B C D E F G H J K L M N P Type* ±0.005 ±0.005 ±0.005 ±0.031 ±0.062 ±0.015 ±0.015 ±0.015 ±0.010 ±0.015 ±0.015 ±0.005 ±0.015 ±0.015 SMcrtegw. [±0.13] [±0.13] [±0.13] [±0.8] [±1.6] [±0.4] [±0.4] [±0.4] [±0.25] [±0.4] [±0.4] [±0.13] [±0.4] [±0.4] UAL-100 2.750 - 2.250 3.500 5.478 1.800 2.813 1.750 0.188 0.800 0.375 0.188 - 12-24 - (2) #8 [69.9] [57.15] [88.9] [139] [45.7] [71.5] [44.5] [4.78] [20.3] [9.52] [4.78] UAL-180 2.750 - 2.500 3.500 5.480 2.125 3.000 2.190 0.250 0.950 0.375 0.188 0.200 12-24 - (2) #8 [69.9] [63.5] [88.9] [139] [54] [76.2] [55.6] [6.4] [24.1] [9.5] [4.8] [5.1] UAL-250 3.875 3.000 2.500 4.500 7.000 2.125 3.00 2.190 0.250 1.000 0.312 0.188 0.200 1/4-20 1.188 (4) #8 [98.4] [76.2] [63.5] [114] [178] [54] [76.2] [55.6] [6.4] [25.4] [7.9] [4.8] [5.1] [30.7] *Built to Mil-Spec standard. Not for new design. F G L N A B C D E H J K M Type* ±0.010 ±0.010 ±0.010 ±0.010 MAX MAX MAX MAX MAX MAX MAX MAX MAX [±0.3] [±0.3] [±0.3] [±0.3] 2.854 6.675 1.646 1.791 4.319 3.504 2.252 0.807 0.409 0.217 0.260 4.819 1.752 UAL-250A [72.5] [167.0] [41.8] [45.5] [109.7] [89.0] [57.2] [20.5] [10.4] [5.5] [6.6] [122.4] [44.5] 2.854 7.260 1.646 1.791 5.028 4.094 2.323 0.807 0.488 0.217 0.260 5.567 2.047 UAL-300A [72.5] [184.4] [41.8] [45.5] [127.7] [104.0] [59.0] [20.5] [12.4] [5.5] [6.6] [141.4] [52.0] *Commercial equivalent for new designs. Cost effective alternative. Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com Revised: 201812_005