FEATURES SPECIFICATIONS • WHM, UltraHigh ohmic value precision series, • WNM, Aryton Perry winding NonInductive available. Inductance <1nH at 1MHZ test, • Designed to meet the most stringent MIL-R-26F, MIL-STD-202 standard requirements • Miniaturized Better power to dimension ratios • Use of the highest quality standard (96% Alumina) ceramic core • Manufacturing process -Wire winding/ Spot Welding- by Computer Numerical Control (CNC) machine tools to ensure consistency of product quality. • Encapsulated by epoxy molding compound • Advanced IC encapsulation mold/die technologies Material Ceramic Core: CeramTec Rubalit® 96% alumina End Caps: Stainless steel, precision formed Leads: Copper wire,100% Sn (lead free) coated ISAOHM alloy resistance wire TC+/-20ppm/°C Encapsulation: SUMICON 1100/ 1200 Epoxy molding compound for IC encapsulation Electrical Standard Tolerance: F (1.0%), J (5.0%) Temperature Coefficient (ppm/°C): ±90 for 0.100Ω ±20 for >0.100Ω Maximum Working Voltage: (PxR)1/2 Derating: Linearly from 100% @ +70°C to 0% @ +150°C. Operating Temp: -55°C to +150°C O R D E R I N G I N F O R M AT I O N H = Inductive N = Non Inductive RoHS compliant ���������� Series Power A = 0.5 B=1 C=2 Ohms Tolerance Package T = Tape F = 1% J = 5% blank = 25pc Pack KEY TO FIVE-BAND CODE ���� � Band 1 Color 2 3 Digit 4 5 Multiplier WH/WN Series Miniature Molded Wirewound 0.984 / 25 � Power Resistance Rating Range Type (watts) (Ω) WHA 0.5 0.100 - 1.0K WNA 0.100 - 250 WHB 1 0.100 - 4.0K WNB 0.100 - 1.0K WHC 2 0.10 - 8.0K WNC 0.10 - 2.0K 0 0 0 x Brown 1 1 1 x 10Ω ± 1% (F) Red 2 2 2 x 100Ω ± 2% (G) Orange 3 3 3 x 1KΩ Yellow 4 4 4 x 10KΩ Green 5 5 5 x 100KΩ ± 0.5% (D) Blue 6 6 6 x 1MΩ ± 0.25% (C) Violet 7 7 7 x 10MΩ ± 0.10% (B) Grey 8 8 8 White 9 9 9 Gold x 0.1Ω ± 5% (J) Silver x 0.01Ω ± 10% (K) d � Dim. L (mm/in) 5.08 / 0.200 Dim. D (mm/in) 2.54 / 0.100 Dim. d (mm/in) 0.60 / 0.024 7.00 / 0.276 3.00 / 0.120 0.60 / 0.024 11.4 / 0.450 6.86 / 0.270 0.80 / 0.031 Test Thermal Shock Conditions of Test Rated power applied until thermal stability, -55°C +0°C,-5°C,15min. Short-time Overload 5 times rated wattage for 5 seconds Solderability Method 208 of MIL-STD-202 Terminal Strength Pull test:10 pounds, 5 to10 seconds, Twist test: 1080°,5 second/rotation Dielectric 500Volts rms for 1W, 2W 1000Volts rms. Withstanding Voltage 1 minute High Temperature Exposed to an ambient temperature of 275 Exposure +5/-0°C for 250 ±8 hours, Moisture Resistance MIL-STD-202 Method 106, 7b not applicable Low Temperature Cold chamber at a temperature of -65 ±2°C Storage for 24+/-4 hours Vibration, High Frequency varied 10 to 2000Hz, 200G peak, Frequency 2 directions 6 hours each Load Life 1000/2000 hours at rated power, +25°C, 1.5 hours “On”, 0.5 hours “Off” Performance ±0.2% ±0.2% ±0.2% ±0.1% ±0.1% ±0.5% ±0.2% ±0.2% ±0.1% ±0.5% S TA N D A R D PA RT N U M B E R S F O R W H / W N S E R I E S 1Ω ± 0.05% D PERFORMANCE CHARACTERISTICS Tolerance Black L Wattage: 0.5 Series: WHA 0.5 WNA 1.0 WHB 1.0 WNB 2.0 WHC 2.0 WNC Ohms 0.1 0.25 0.50 0.75 WHAR10FE WHAR25FE WHAR50FE WHAR75FE WNAR10FE WNAR25FE WNAR50FE WNAR75FE WHBR10FE WHBR25FE WHBR50FE WHBR75FE WNBR10FE WNBR25FE WNBR50FE WNBR75FE WHCR10FE WHCR25FE WHCR50FE WHCR75FE WNCR10FE WNCR25FE WNCR50FE WNCR75FE 1 2 4 5 WHA1R0FE WHA2R0FE WHA4R0FE WHA5R0FE WNA1R0FE WNA2R0FE WNA4R0FE WNA5R0FE WHB1R0FE WHB2R0FE WHB4R0FE WHB5R0FE WNB1R0FE WNB2R0FE WNB4R0FE WNB5R0FE WHC1R0FE WHC2R0FE WHC4R0FE WHC5R0FE WNC1R0FE WNC2R0FE WNC4R0FE WNC5R0FE 10 15 25 51 WHA10RFE WHA15RFE WHA25RFE WHA51RFE WNA10RFE WNA15RFE WNA25RFE WNA51RFE WHB10RFE WHB15RFE WHB25RFE WHB51RFE WNB10RFE WNB15RFE WNB25RFE WNB51RFE WHC10RFE WHC15RFE WHC25RFE WHC51RFE WNC10RFE WNC15RFE WNC25RFE WNC51RFE 75 100 150 200 WHA75RFE WHA100FE WHA150FE WHA200FE WNA75RFE WNA100FE WNA150FE WNA200FE WHB75RFE WHB100FE WHB150FE WHB200FE WNB75RFE WNB100FE WNB150FE WNB200FE WHC75RFE WHC100FE WHC150FE WHC200FE WNC75RFE WNC100FE WNC150FE WNC200FE 250 330 470 560 WHA250FE WHA330FE WHA470FE WHA560FE WNA250FE WHB250FE WHB330FE WHB470FE WHB560FE WNB250FE WNB330FE WNB470FE WNB560FE WHC250FE WHC330FE WHC470FE WHC560FE WNC250FE WNC330FE WNC470FE WNC560FE 750 1K 2.5K WHA750FE WHA1K0FE WHB750FE WHB1K0FE WHB2K5FE WNB750FE WNB1K0FE WHC750FE WHC1K0FE WHC2K5FE WNC750FE WNC1K0FE Check product availability at www.ohmite.com Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] 15