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| UAL Series AluminumHousedWirewoundResistors * * * * * * * UAL-25-4T UAL-25-4 UAL-25-4TR 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 Type UAL-5 UAL-10 UAL-25 UAL-50 UAL-100 UAL-180 UAL-250 UAL-300 MIL-R-39009 MIL-R-18546 Style PowerRating(W@25C) Commercial 7.5a 12.5a 25b 50c 100d 180d 250d 300e 1 a MIL 5a 10a 20b 30c 75d 120d - FreeAir 4.5 7.5 12 20 40 100 75 Resistance Range1 0.01to22K 0.01to47K 0.01to90K 0.01to250K 0.01to50K 0.01to50K 0.01to50K 0.005to100K RER-60/RE-60 RER-65/RE-65 RER-70/RE-70 RER-75/RE-75 RER-77/RE-77 RER-80/RE-80 - Fornon-inductivewindings,dividemaximumresistanceby2 HeatsinkRequired:0.040[1.0]Alum.Plate,129in2[832cm2]orequiv. b HeatsinkRequired:0.040[1.0]Alum.Plate,167in2[1077cm2]orequiv. c HeatsinkRequired:0.059[1.5]Alum.Plate,291in2[1877cm2]orequiv. d HeatsinkRequired:0.125[3.2]Alum.Plate,294in2[1896cm2]orequiv. e HeatsinkRequired:0.125[3.2]Alum.Plate,895in2[5780cm2]orequiv. Ordering Information ForNon-InductiveWindings/inserttheletter"N"(i.e.UALN-25) PartNumber-Resistance-Tolerance-TCR(Ifnotstandard) Example:UAL-2510Ohm1% 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 info@willow.co.uk rev.03/2006A UAL Series AluminumHousedWirewoundResistors SPECIFICATIONS (continued) Specification Tolerances Temperature Coefficient Value 0.01%to10%(1%Standard) >10W:20ppm/K 1Wto10W:50ppm/K <1W:CallFactory -55Cto+275C 1500VAC Centerlessgroundceramiccore Tinnedcopperorcopperweldleads High-temperatureepoxymoldingCompound Anodizedaluminumhousing Allweldedterminations TemperatureRange DielectricStrength Constuction EnvironmentalPerformance (MIL-STD202) DR 0.2%+0.05W 1%+0.05W 0.2%+0.05W 0.2%+0.05W 0.2%+0.05W 0.2%+0.05W 0.1%+0.05W 0.1%+0.05W Dielectric LoadLife Storage MoistureResistance ThermalShock 5XOverload(5s) Shock Vibration PowerDeratingCurve 120 100 80 Mo un ted on Power(%) He 60 40 20 0 0 A B C D ats ink Free-air Derating A : UAL-5, UAL-10 B : UAL-25 C : UAL-50, UAL-100, UAL-250 D : UAL-300 50 100 150 200 250 300 350 AmbientTemperature(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 info@willow.co.uk rev.03/2006A UAL Series AluminumHousedWirewoundResistors Dimensions Type UAL-5 UAL-10 UAL-25 UAL-50 0.005 [0.13] 0.444 [11.3] 0.562 [14.3] 0.719 [18.3] 1.563 [39.7] A 0.005 [0.13] 0.490 [12.4] 0.625 [15.9] 0.781 [19.8] 0.844 [21.4] B 0.031 [0.8] 0.600 [15.2] 0.750 [19.1] 1.062 [27.0] 1.968 [50.0] C 0.062 [1.6] 1.125 [28.5] 1.375 [35.0] 1.938 [49.2] 2.781 [70.6] D 0.015 [0.4] 0.334 [8.5] 0.430 [10.9] 0.530 [13.5] 0.615 [15.6] E 0.015 [0.4] 0.646 [16.4] 0.800 [20.3] 1.080 [27.4] 1.140 [29.0] F 0.015 [0.4] 0.320 [8.1] 0.400 [10.2] 0.560 [14.2] 0.615 [15.6] G 0.010 [0.25] 0.065 [1.7] 0.075 [1.9] 0.085 [2.2] 0.085 [2.2] H 0.010 [0.25] 0.140 [3.6] 0.190 [4.8] 0.260 [6.6] 0.300 [7.6] J 0.010 [0.25] 0.078 [2.0] 0.093 [2.4] 0.172 [4.4] 0.196 [5.0] K 0.005 [0.13] 0.093 [2.4] 0.093 [2.4] 0.125 [3.2] 0.125 [3.2] L 0.015 [0.4] 0.078 [2.0] 0.102 [2.6] 0.125 [3.2] 0.125 [3.2] M 0.005 [0.13] 0.050 [1.3] 0.086 [2.2] 0.086 [2.2] 0.086 [2.2] N 0.062 [1.6] 0.266 [6.8] 0.312 [7.9] 0.438 [11.1] 0.438 [11.1] O 0.031 [0.8] 0.245 [6.2] 0.312 [7.9] 0.391 [9.9] 0.422 [10.7] P 0.002 [0.05] 0.051 [1.30] 0.081 [2.06] 0.081 [2.06] 0.081 [2.06] Q 0.031 [0.8] 0.085 [2.2] 0.140 [3.6] 0.140 [3.6] 0.140 [3.6] R Type UAL-100 UAL-180 UAL-250 0.005 [0.13] 2.750 [69.9] 2.750 [69.9] 3.875 [98.4] A 0.005 [0.13] 3.000 [76.2] Aa 0.005 [0.13] 2.250 [57.2] 2.500 [63.5] 1.062 [63.5] B 0.031 [0.8] 3.500 [88.9] 3.500 [88.9] 4.500 [114] C 0.062 [1.6] 5.480 [139] 5.480 [139] 7.000 [178] D 0.015 [0.4] 1.800 [45.7] 2.100 [55.3] 2.100 [55.3] E 0.015 [0.4] 2.810 [71.4] 3.000 [76.2] 3.00 [76.2] F 0.015 [0.4] 1.750 [44.5] 2.190 [55.6] 2.190 [55.6] G 0.010 [0.25] 0.188 [4.8] 0.250 [6.4] 0.250 [6.4] H 0.015 [0.4] 0.800 [20.3] 0.950 [24.1] 1.000 [25.4] J 0.015 [0.4] 0.375 [9.5] 0.375 [9.5] 0.312 [7.9] K 0.005 [0.13] 0.188 [4.8] 0.188 [4.8] 0.188 [4.8] L 0.015 [0.4] 0.225 [5.7] 0.200 [5.1] 0.200 [5.1] M N 0.015 [0.4] 1.188 [30.7] P Mtg. Screw 12-24 12-24 1/4-20 (2)#8 (2)#8 (4)#8 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 info@willow.co.uk 03/2006A UAL Series AluminumHousedWirewoundResistors Dimensions (continued) Type UAL-300 MAX A MAX B MAX C MAX D MAX E 0.010 [0.3] F 0.010 [0.3] G MAX H MAX J MAX K 0.010 [0.3] L MAX M 0.010 [0.3] N 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 info@willow.co.uk 03/2006A |
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