UW Series Ceramic Wirewound Resistors • • • • • • • Resistances from 0.01 to 91kOhms Tolerance to ±0.01% Low Temperature Coefficient Power Rating to 15Watts All Welded Resistance Element Non-Inductive Windings are Available Flameproof Inorganic Construction SPECIFICATIONS L H HS W d2 Type Power Rating W @ 70°C Resistance1 Range ±0.04 [±1.0] ±0.04 [±1.0] ±0.04 [±1.0] ±0.015 [±0.4] ±0.015 [±0.4] UW-2 2 0.01 to 22k 0.700 [17.8] 0.245 [6.2] 0.300 [7.6] 0.255 [6.5] 0.032 [0.8] UW-3 3 0.01 to 22k 0.875 [22.2] 0.312 [7.9] 0.375 [9.5] 0.312 [7.9] 0.032 [0.8] UW-5 5 0.01 to 45k 0.875 [22.2] 0.375 [9.5] 0.437 [11.1] 0.375 [9.5] 0.032 [0.8] UW-10 10 0.01 to 65k 1.875 [48] 0.375 [9.5] 0.500 [12.7] 0.375 [9.5] 0.040 [1.0] UW-15 15 0.01 to 91k 1.875 [48] 0.500 [12.7] 0.625 [15.9] 0.500 [12.7] 0.040 [1.0] 1 2 For non-inductive windings / divide maximum resistance by 2 Lead Diameter: 18 AWG = 0.040” / 20 AWG = 0.032” Ordering Information For Non-Inductive Windings / insert the letter “N” ( i.e. UWN-5 ) Part Number - Resistance - Tolerance - TCR ( If not standard ) Example: UW-5 100 Ohm 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 UW Series Ceramic Wirewound 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 +275°C Dielectric Strength 1500 VAC Constuction Centerless ground ceramic core Tinned copper or copperweld leads High temperature / inorganic potting compound All welded terminations Environmental Performance DR Dielectric ±0.2% + 0.05W Load Life ±1% + 0.05W 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 (MIL-STD 202) Power Derating Curve 120 Power ( % ) 100 80 60 40 20 0 0 50 100 150 200 250 300 350 Ambient Temperature (°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 [email protected] rev. 03/2006A