UB Series Miniature Silicone Coated Power Resistors • High Power Rating in a Small Package • Excellent Pulse Handling • High Temperature: -55°C to +250°C • Resistances from 0.02 to 260kOhms • Power Rating 1 to 15Watts • Resistance Tolerances to ± 0.01% • Low TCR: ± 20ppm/K Standard • MIL-R-26 / MIL-R-39007 Power Ratings • Non-Inductive Windings Available • Flame resistant coating SPECIFICATIONS Dimensions Maximum MIL-R-26 / Wattage Rating Maximum Type ( Watts ) Ohms 2 A B3 C1 Working MIL-R-39007 Voltage Style ±0.062” ±0.031” ±0.002” [±1.6mm] [±0.8mm] [±0.05mm] 0.020 [0.5] RW-81 UB-1 1 3.4k 0.250 [6.4] 0.085 [2.2] 33 0.025 [0.6] RWR-81 0.020 [0.5] UB-2 1.5 7.5k 0.312 [7.9] 0.078 [2.0] 42 RWR-82 0.025 [0.6] 0.025 [0.6] RW-80 UB-3 2 10k 0.406 [10.3] 0.094 [2.4] 80 0.020 [0.5] RWR-80 UB-3C 3 12.5k 0.350 [8.9] 0.156 [4.0] 0.032 [0.8] 135 UB-5 4 25k 0.560 [14.2] 0.187 [4.7] 0.032 [0.8] 162 UB-5C 5 32k 0.500 [12.7] 0.250 [6.4] 0.040 [1.0] 194 UB-6 6 50k 0.625 [15.9] 0.250 [6.4] 0.040 [1.0] 258 UB-10 7 95k 0.875 [22.2] 0.312 [7.9] 0.040 [1.0] 425 RW-84 UB-12 10 150k 1.220 [31.0] 0.312 [7.9] 0.040 [1.0] 607 UB-15 15 260k 1.780 [45.2] 0.375 [9.5] 0.040 [1.0] 1050 1 Lead Diameter: 18 AWG = 0.040” / 20 AWG = 0.032” / 22 AWG = 0.025” / 24 AWG = 0.020” Where more than one lead is listed / the top value is Standard 2 For non-inductive windings / divide maximum resistance by 2 3 For non-inductive winding where R ≤ 0.10 Ohms, Tolerance is +0.063/-0.00 [+1.6/-0.0 mm] Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com Revised: 201807_001

UB Series Silicone Coated Power 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 +250°C Dielectric Strength 500 VAC : UB-1 / UB-2 / UB-3 1000 VAC : All Others Construction Centerless ground ceramic core Matte Tin over Copper Flame resistant / High temperature / trivalent / inorganic Silicone coating All welded terminations Environmental Performance DR (MIL-STD 202) Dielectric ±0.2% + 0.05W Load Life To ±1% Depending on Size and Resistance Value 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 Power Derating Curve 120 100 ) % 80 r ( 60 e w 40 o P 20 0 0 -50 0 50 100 150 200 250 300 Ambient Temperature (°C) Ordering Information For Non-Inductive Windings / insert the letter “N” ( i.e. UBN-5 ) Part Description: Part Type - Resistance - Tolerance - TCR ( If not standard ) Example: UB-3 10 Ohm 1% Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 © Riedon, Inc. www.riedon.com sales@riedon.com Revised: 201807_001