UAL Series Aluminum Housed Wirewound Resistors • • • • • • • UAL-25-4T UAL-25-4 Power Rating 5 to 300Watts All Welded Construction Resistances from 0.005 to 250kOhms Tolerance to ±0.01% High Overload and Pulse Handling Low TCR: ± 20ppm/K Standard Four Terminal Versions Available 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 12.5 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-100 RER-77 / RE-77 100 d 75 d 40 0.01 to 50K UAL-180 - 180 d - - 0.01 to 50K UAL-250 RER-80 / RE-80 250 d 120 d 100 0.01 to 50K UAL-300 - 300 e - 75 0.005 to 100K Power Rating ( W @ 25°C ) Resistance Range1 For non-inductive windings, divide maximum resistance by 2 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 a Ordering Information For Non-Inductive Windings / insert the letter “N” ( i.e. UALN-25 ) Part Number - Resistance - Tolerance - TCR ( If not standard ) Example: UAL-25 10 Ohm 1% Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom. http://www.willow.co.uk + 44 (0) 1342 835234 + 44 (0) 1342 834306 [email protected] rev. 03/2006A UAL Series Aluminum Housed 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 1500 VAC Constuction Centerless ground ceramic core Tinned copper or copperweld leads High-temperature epoxy molding Compound Anodized aluminum housing All welded terminations Environmental Performance DR 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 (MIL-STD 202) Power Derating Curve 120 100 Mo un Power ( % ) 80 ted on He A 60 Free-air Derating A : UAL-5, UAL-10 B : UAL-25 C : UAL-50, UAL-100, UAL-250 D : UAL-300 ats ink B C 40 D 20 0 0 50 100 150 200 250 300 350 Ambient Temperature (°C) Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom. http://www.willow.co.uk + 44 (0) 1342 835234 + 44 (0) 1342 834306 [email protected] rev. 03/2006A UAL Series Aluminum Housed Wirewound Resistors Dimensions Type A B C D E F G H J K L M N O P Q R ±0.005 [±0.13] ±0.005 [±0.13] ±0.031 [±0.8] ±0.062 [±1.6] ±0.015 [±0.4] ±0.015 [±0.4] ±0.015 [±0.4] ±0.010 [±0.25] ±0.010 [±0.25] ±0.010 [±0.25] ±0.005 [±0.13] ±0.015 [±0.4] ±0.005 [±0.13] ±0.062 [±1.6] ±0.031 [±0.8] ±0.002 [±0.05] ±0.031 [±0.8] UAL-5 0.444 [11.3] 0.490 [12.4] 0.600 [15.2] 1.125 [28.5] 0.334 [8.5] 0.646 [16.4] 0.320 [8.1] 0.065 [1.7] 0.140 [3.6] 0.078 [2.0] 0.093 [2.4] 0.078 [2.0] 0.050 [1.3] 0.266 [6.8] 0.245 [6.2] 0.051 [1.30] 0.085 [2.2] UAL-10 0.562 [14.3] 0.625 [15.9] 0.750 [19.1] 1.375 [35.0] 0.430 [10.9] 0.800 [20.3] 0.400 [10.2] 0.075 [1.9] 0.190 [4.8] 0.093 [2.4] 0.093 [2.4] 0.102 [2.6] 0.086 [2.2] 0.312 [7.9] 0.312 [7.9] 0.081 [2.06] 0.140 [3.6] UAL-25 0.719 [18.3] 0.781 [19.8] 1.062 [27.0] 1.938 [49.2] 0.530 [13.5] 1.080 [27.4] 0.560 [14.2] 0.085 [2.2] 0.260 [6.6] 0.172 [4.4] 0.125 [3.2] 0.125 [3.2] 0.086 [2.2] 0.438 [11.1] 0.391 [9.9] 0.081 [2.06] 0.140 [3.6] UAL-50 1.563 [39.7] 0.844 [21.4] 1.968 [50.0] 2.781 [70.6] 0.615 [15.6] 1.140 [29.0] 0.615 [15.6] 0.085 [2.2] 0.300 [7.6] 0.196 [5.0] 0.125 [3.2] 0.125 [3.2] 0.086 [2.2] 0.438 [11.1] 0.422 [10.7] 0.081 [2.06] 0.140 [3.6] ±0.005 [±0.13] ±0.005 [±0.13] ±0.005 [±0.13] ±0.031 [±0.8] ±0.062 [±1.6] ±0.015 [±0.4] ±0.015 [±0.4] ±0.015 [±0.4] ±0.010 [±0.25] ±0.015 [±0.4] ±0.015 [±0.4] ±0.005 [±0.13] ±0.015 [±0.4] M N UAL-100 2.750 [69.9] - 2.250 [57.2] 3.500 [88.9] 5.480 [139] 1.800 [45.7] 2.810 [71.4] 1.750 [44.5] 0.188 [4.8] 0.800 [20.3] 0.375 [9.5] 0.188 [4.8] 0.225 [5.7] 12-24 - (2) #8 UAL-180 2.750 [69.9] - 2.500 [63.5] 3.500 [88.9] 5.480 [139] 2.100 [55.3] 3.000 [76.2] 2.190 [55.6] 0.250 [6.4] 0.950 [24.1] 0.375 [9.5] 0.188 [4.8] 0.200 [5.1] 12-24 - (2) #8 UAL-250 3.875 [98.4] 3.000 [76.2] 1.062 [63.5] 4.500 [114] 7.000 [178] 2.100 [55.3] 3.00 [76.2] 2.190 [55.6] 0.250 [6.4] 1.000 [25.4] 0.312 [7.9] 0.188 [4.8] 0.200 [5.1] 1/4-20 1.188 [30.7] (4) #8 Type A Aa B C D E F G H J K L P ±0.015 [±0.4] Mtg. Screw Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom. http://www.willow.co.uk + 44 (0) 1342 835234 + 44 (0) 1342 834306 [email protected] 03/2006A UAL Series Aluminum Housed Wirewound Resistors Dimensions (continued) A B C D E F G H J K L M N Type MAX MAX MAX MAX MAX ±0.010 [±0.3] ±0.010 [±0.3] MAX MAX MAX ±0.010 [±0.3] MAX ±0.010 [±0.3] UAL-300 2.854 [72.5] 7.260 [184.4] 1.646 [41.8] 1.791 [45.5] 5.028 [127.7] 4.094 [104.0] 2.323 [59.0] 0.807 [20.5] 0.488 [12.4] 0.217 [5.5] 0.260 [6.6] 5.567 [141.4] 2.047 [52.0] Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom. http://www.willow.co.uk + 44 (0) 1342 835234 + 44 (0) 1342 834306 [email protected] 03/2006A