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FEATURES
* 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
SPECIFICATIONS
Material Ceramic Core: CeramTec Rubalit(R) 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 0.100 20 for >0.100 Maximum Working Voltage: (PxR)1/2 Derating: Linearly from 100% @ +70C to 0% @ +150C. Operating Temp: -55C to +150C
WH/WN Series
Miniature Molded Wirewound
L D d 0.984 / 25

Power Resistance Rating Range Type (watts) () 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
Dim. L (mm/in) 5.08 / 0.200 7.00 / 0.276 11.4 / 0.450
Dim. D (mm/in) 2.54 / 0.100 3.00 / 0.120 6.86 / 0.270
Dim. d (mm/in) 0.60 / 0.024 0.60 / 0.024 0.80 / 0.031
PERFORMANCE CHARACTERISTICS
Test Thermal Shock Conditions of Test Rated power applied until thermal stability, -55C +0C,-5C,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/-0C for 250 8 hours, Moisture Resistance MIL-STD-202 Method 106, 7b not applicable Low Temperature Cold chamber at a temperature of -65 2C 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, +25C, 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%
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 Color Black Brown Red Orange Yellow Green Blue Violet Grey White Gold Silver
1 0 1 2 3 4 5 6 7 8 9
2 Digit 0 1 2 3 4 5 6 7 8 9
3 0 1 2 3 4 5 6 7 8 9 x x x x x x x x x
4 Multiplier 1 10 100 1K 10K
5 Tolerance 1% (F) 2% (G)
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
Wattage: 0.5 Series: WHA Ohms 0.1 0.25 0.50 0.75 1 2 4 5 10 15 25 51 75 100 150 200 250 330 470 560 750 1K 2.5K WHAR10FE WHAR25FE WHAR50FE WHAR75FE WHA1R0FE WHA2R0FE WHA4R0FE WHA5R0FE WHA10RFE WHA15RFE WHA25RFE WHA51RFE WHA75RFE WHA100FE WHA150FE WHA200FE WHA250FE WHA330FE WHA470FE WHA560FE WHA750FE WHA1K0FE WNAR10FE WNAR25FE WNAR50FE WNAR75FE WNA1R0FE WNA2R0FE WNA4R0FE WNA5R0FE WNA10RFE WNA15RFE WNA25RFE WNA51RFE WNA75RFE WNA100FE WNA150FE WNA200FE WNA250FE WHBR10FE WHBR25FE WHBR50FE WHBR75FE WHB1R0FE WHB2R0FE WHB4R0FE WHB5R0FE WHB10RFE WHB15RFE WHB25RFE WHB51RFE WHB75RFE WHB100FE WHB150FE WHB200FE WHB250FE WHB330FE WHB470FE WHB560FE WHB750FE WHB1K0FE WHB2K5FE WNBR10FE WNBR25FE WNBR50FE WNBR75FE WNB1R0FE WNB2R0FE WNB4R0FE WNB5R0FE WNB10RFE WNB15RFE WNB25RFE WNB51RFE WNB75RFE WNB100FE WNB150FE WNB200FE WNB250FE WNB330FE WNB470FE WNB560FE WNB750FE WNB1K0FE WHCR10FE WHCR25FE WHCR50FE WHCR75FE WHC1R0FE WHC2R0FE WHC4R0FE WHC5R0FE WHC10RFE WHC15RFE WHC25RFE WHC51RFE WHC75RFE WHC100FE WHC150FE WHC200FE WHC250FE WHC330FE WHC470FE WHC560FE WHC750FE WHC1K0FE WHC2K5FE WNCR10FE WNCR25FE WNCR50FE WNCR75FE WNC1R0FE WNC2R0FE WNC4R0FE WNC5R0FE WNC10RFE WNC15RFE WNC25RFE WNC51RFE WNC75RFE WNC100FE WNC150FE WNC200FE WNC250FE WNC330FE WNC470FE WNC560FE WNC750FE WNC1K0FE 0.5 WNA 1.0 WHB 1.0 WNB 2.0 WHC 2.0 WNC
x 100K 1M 10M
0.5% (D) 0.25% (C) 0.10% (B) 0.05%
0.1 0.01

5% (J) 10% (K)
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 * info@ohmite.com
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