rev. 03/2006a 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 ? ? ? ? ? ? ? specifications 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% UAL-25-4t UAL-25-4 UAL-25-4tr UAL series aluminum housed wirewound resistors ordering information type mil-r-39009 mil-r-18546 style power rating ( w @ 25c ) resistance range 1 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 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 1 for non-inductive windings, divide maximum resistance by 2 a heatsink required : 0.040 [1.0] alum. plate, 129 in 2 [832 cm 2 ] or equiv. b heatsink required : 0.040 [1.0] alum. plate, 167 in 2 [1077 cm 2 ] or equiv. c heatsink required : 0.059 [1.5] alum. plate, 291 in 2 [1877 cm 2 ] or equiv. d heatsink required : 0.125 [3.2] alum. plate, 294 in 2 [1896 cm 2 ] or equiv. e heatsink required : 0.125 [3.2] alum. plate, 895 in 2 [5780 cm 2 ] or equiv. willow technologies ltd. shawlands court, newchapel road, lingfield, surrey, rh7 6bl, united kingdom. + 44 (0) 1342 835234 + 44 (0) 1342 834306 info@willow.co.uk http://www.willow.co.uk
rev. 03/2006a specifications (continued) UAL series specifcation value tolerances 0.01% to 10% ( 1% standard ) temperature coeffcient >10 w : 20ppm/k 1 w to10 w : 50ppm/k <1 w : call factory temperature range -55c to +275c 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 (mil-std 202) d r dielectric 0.2% + 0.05 w load life 1% + 0.05 w storage 0.2% + 0.05 w moisture resistance 0.2% + 0.05 w thermal shock 0.2% + 0.05 w 5x overload ( 5s ) 0.2% + 0.05 w shock 0.1% + 0.05 w vibration 0.1% + 0.05 w aluminum housed wirewound resistors power derating curve free-air derating a : UAL-5, UAL-10 b : UAL-25 c : UAL-50, UAL-100, UAL-250 d : UAL-300 0 50 100 150 200 250 300 350 0 20 40 60 80 100 120 power ( % ) ambient temperature (c) mounted on heatsink a b c d willow technologies ltd. shawlands court, newchapel road, lingfield, surrey, rh7 6bl, united kingdom. + 44 (0) 1342 835234 + 44 (0) 1342 834306 info@willow.co.uk http://www.willow.co.uk
03/2006a dimensions type a 0.005 [0.13] b 0.005 [0.13] c 0.031 [0.8] d 0.062 [1.6] e 0.015 [0.4] f 0.015 [0.4] g 0.015 [0.4] h 0.010 [0.25] j 0.010 [0.25] k 0.010 [0.25] l 0.005 [0.13] m 0.015 [0.4] n 0.005 [0.13] o 0.062 [1.6] p 0.031 [0.8] q 0.002 [0.05] r 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] type a 0.005 [0.13] aa 0.005 [0.13] b 0.005 [0.13] c 0.031 [0.8] d 0.062 [1.6] e 0.015 [0.4] f 0.015 [0.4] g 0.015 [0.4] h 0.010 [0.25] j 0.015 [0.4] k 0.015 [0.4] l 0.005 [0.13] m 0.015 [0.4] n p 0.015 [0.4] mtg. screw 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 UAL series aluminum housed wirewound resistors willow technologies ltd. shawlands court, newchapel road, lingfield, surrey, rh7 6bl, united kingdom. + 44 (0) 1342 835234 + 44 (0) 1342 834306 info@willow.co.uk http://www.willow.co.uk
03/2006a UAL series aluminum housed wirewound resistors dimensions (continued) type a max b max c max d max e max f 0.010 [0.3] g 0.010 [0.3] h max j max k max l 0.010 [0.3] m max n 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. + 44 (0) 1342 835234 + 44 (0) 1342 834306 info@willow.co.uk http://www.willow.co.uk
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