UT Series Silicone Coated Power Resistors • • • • • • • Resistances from 0.005 to 260kOhms Power Rating 0.1 to 13Watts Resistance Tolerances to ± 0.01% Low TCR: ± 20ppm/K Standard MIL-R-26 / MIL-R-39007 Power Ratings Temperature Range: -55°C to +350°C ( “V” Rating ) Non-Inductive Windings Available SPECIFICATIONS 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 +250°C : Characteristic U -55°C to +350°C : Characteristic V Dielectric Strength 500 VAC : UT-1 / UT-1/2A / UT-1/2 / UT-1A 1000 VAC : All Others Constuction Centerless ground ceramic core Tinned copper or copperweld leads High temperature / trivalent / inorganic Silicone coating All welded terminations Environmental Performance DR (MIL-STD 202) Characteristic U Characteristic V Dielectric ±0.2% + 0.05W ±0.2% + 0.05W Load Life ±1% + 0.05W ±3% + 0.05W Storage ±0.2% + 0.05W ±2% + 0.05W Moisture Resistance ±0.2% + 0.05W ±2% + 0.05W Thermal Shock ±0.2% + 0.05W ±2% + 0.05W 5X Overload ( 5s ) ±0.2% + 0.05W ±2% + 0.05W Shock ±0.1% + 0.05W ±0.2% + 0.05W Vibration ±0.1% + 0.05W ±0.2% + 0.05W Power Derating Curve 120 Power ( % ) 100 80 CH AR 60 CH AR 40 V U 20 0 0 Ordering Information 50 100 150 200 250 300 350 400 Ambient Temperature (°C) For Non-Inductive Windings / insert the letter “N” ( i.e. UTN-5 ) Part Number - Resistance - Tolerance - TCR ( If not standard ) Example: UT-5 25kOhms 0.1% 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 UT Series Silicone Coated Power Resistors SPECIFICATIONS (continued) Type Wattage Rating ( Watts ) Dimensions Maximum Ohms 2 A B C 1 Maximum Working Voltage MIL-R-26 / MIL-R-39007 Style ±0.062” [±1.6mm] ±0.031” [±0.8mm] ±0.002” [±0.05mm] 500 0.150 [3.8] 0.078 [2.0] 0.018 [0.46] 8.5 0.5 2.5k 0.250 [6.4] 0.078 [2.0] 0.020 [0.5] 0.025 [0.6] 20 0.75 0.9 7.5k 0.330 [8.4] 0.078 [2.0] 0.020 [0.5] 0.025 [0.6] 29 UT-1A 1.0 1.5 10k 0.406 [10.3] 0.094 [2.4] 0.020 [0.5] 0.025 [0.6] 52 UT-2 1.5 2.0 12.5k 0.350 [8.9] 0.156 [4.0] 0.032 [0.8] 0.025 [0.6] 60 UT-2A 2.5 3.0 22k 0.500 [12.7] 0.187 [4.7] 0.032 [0.8] 130 RW-69 UT-2B 3.0 3.75 22k 0.560 [14.2] 0.187 [4.7] 0.032 [0.8] 140 RW-79 RWR-79 UT-2C 3.0 4.0 40k 0.500 [12.7] 0.250 [6.4] 0.040 [1.0] 0.032 [0.8] 140 UT-2E 3.0 3.5 30k 0.500 [12.7] 0.200 [5.1] 0.032 [0.8] 140 UT-3 4.0 5.5 45k 0.625 [15.9] 0.250 [6.4] 0.032 [0.8] 0.040 [1.0] 210 UT-5 5.0 6.5 91k 0.875 [22.2] 0.312 [7.9] 0.040 [1.0] 360 UT-5A 5.0 6.5 65k 0.970 [24.6] 0.203 [5.2] 0.032 [0.8] 390 UT-6 5.0 6.5 95k 1.000 [25.4] 0.312 [7.9] 0.040 [1.0] 504 UT-7A3 7.0 9.0 150k 1.375 [35.0] 0.375 [9.5] 0.040 [1.0] 650 UT-7B 7.0 9.0 100k 1.400 [35.6] 0.312 [7.9] 0.040 [1.0] 590 UT-7C 7.0 9.0 154k 1.220 [31.0] 0.312 [7.9] 0.040 [1.0] 620 UT-10 10 13 260k 1.780 [45.2] 0.375 [9.5] 0.040 [1.0] 850 U V UT-1 0.1 0.25 UT-1/2A 0.4 UT-1/23 RW-70 RW-74 RWR-74 RW-67 RW-78 RWR-78 Lead Diameter: 18 AWG = 0.040” / 20 AWG = 0.032” / 22 AWG = 0.025” / 24 AWG = 0.020” / 25 AWG = 0.018” Where more than one lead is listed / the top value is Standard 2 For non-inductive windings / divide maximum resistance by 2 3 This part does not meet the RoHS directive - call factory for details 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