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: -55C to +350C ( "V" Rating ) Non-Inductive Windings Available SPECIFICATIONS Specification Value Tolerances 0.01% to 10% ( 1% Standard ) Temperature Coefficient >10 : 20ppm/K 1 to10 : 50ppm/K <1 : Call Factory Temperature Range -55C to +250C : Characteristic U -55C to +350C : 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 R Environmental Performance (MIL-STD 202) Characteristic U Characteristic V Dielectric 0.2% + 0.05 0.2% + 0.05 Load Life 1% + 0.05 3% + 0.05 Storage 0.2% + 0.05 2% + 0.05 Moisture Resistance 0.2% + 0.05 2% + 0.05 Thermal Shock 0.2% + 0.05 2% + 0.05 5X Overload ( 5s ) 0.2% + 0.05 2% + 0.05 Shock 0.1% + 0.05 0.2% + 0.05 Vibration 0.1% + 0.05 0.2% + 0.05 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% Riedon Inc. 1.01 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 135 UT Series Silicone Coated Power Resistors SPECIFICATIONS (continued) Type 1 2 Dimensions Maximum Ohms 2 1 Maximum Working Voltage MIL-R-26 / MIL-R-39007 Style A B C 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] 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] 0.040 [1.0] 0.032 [0.8] 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-7A 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-1/2 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 For non-inductive windings / divide maximum resistance by 2 Riedon Inc. 1.01 Wattage Rating ( Watts ) 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 136