Axiohm Centohm Coated Axial Terminal Wirewound Ohmite’s Axiohm resistors are Centohm coated for maximum reliability. These all-welded units are characterized by their low temperature coefficients and resistance to thermal shock, making them ideal for a wide range of electrical and electronic applications. F e at u r e s Options •Welded construction •Inorganic and non-hygroscopic, Centohm coating seals and protects the resistance wire. •Exceeds MIL-R-26 moisture requirements •Centohm Resistors are designed to meet and exceed performance characteristics of vitreous enamel resistors. •Centohm is more cost effective than vitreous enamel. •±5% resistance tolerance Noninductive: This specially designed version is wound using the Ayrton-Perry method. Resistance Tolerances: Options include 5%, 1%, 0.5%, 0.25%, and 0.1% resistors. Terminal Sizes: Alternate terminal diameters available. Tape and Reel: Resistors taped for automatic insertion. Contact Ohmite for size, quantity and ordering information S e r i e s s p e c i f i c at i o n s Watt Rating Form 1C 2C 3C 4C 5C 7C 10C Resistance Range (Ω) Min. Max. 0.1 4K 0.1 10K 0.1 20K 0.1 30K 0.1 40K 0.1 50K 0.1 90K Standard Resistance Tolerance ±5% ±5% ±5% ±5% ±5% ±5% ±5% Dielectric Withstanding Voltage 500 500 500 500 500 500 500 Maximum Voltage Rating 100 300 450 600 800 875 1600 Characteristics Coating Flameproof proprietary Centohm Core Ceramic Element Copper-nickel alloy or nickel-chrome alloy depending on resistance value End Cap Stainless steel Terminals Tinned Copper weld. RoHS solder composition is 96% Sn, 3.5% Ag, 0.5% Cu Derating Linearly from 100% @ +25°C to 0% @ +350°C. Tolerance ±5% (Std) down to 0.1% available. Power rating Based on 25°C free air rating (other wattages available). Overload Under 5 watts: 5 times rated wattage for 5 seconds. 5 watts and over: 10 times rated wattage for 5 seconds. Temperature coefficient ±30ppm /°C above 10Ω ±100ppm/°C 1 to 10Ω ±200ppm/°C below 1Ω (continued) 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] 91 Axiohm Centohm Coated Axial Terminal Wirewound Dimensions (in./mm) 1.5 in. / 38.1mm A B C D Watt Rating A B Form ±.063”/±1.60mm ±.031”/0.79mm C Wire Gauge (dia.) D max. clean term. to clean term. in./mm 1C 0.094 / 2.39 #24 (.020”) 0.406 / 10.31 0.5 / 12.7 0.219 / 5.56 #20 (.032”) 0.594 / 15.09 0.938 / 23.83 0.219 / 5.56 #20 (.032”) 1.063 / 27.00 2C 3C 0.313±.031 / 7.95±.79 0.375 / 9.53 4C 0.688 / 17.48 7C 1 / 25.4 5C 10C 0.219 / 5.56 #20 (.032”) 0.219 / 5.56 #20 (.032”) 0.313 / 7.95 1.563 / 39.7 #20 (.032”) 0.313 / 7.95 #20 (.032”) 0.469 / 11.91 0.813 / 20.65 1.125 / 28.58 1.688 / 42.67 P e r fo r m a n c e da t a Test Maximum Temperature Coefficient ±30ppm/°C above 10Ω ±100ppm/°C 1 to 10Ω ±200ppm/°C below 1Ω Thermal Shock ± (2% + .05Ω)∆R Short Time Overload ± (2% + .05Ω)∆R Dielectric ± (0.1% + .05Ω)∆R Low Temperature Storage ± (2% + .05Ω)∆R High Temperature Exposure ± (2% + .05Ω)∆R Moisture Resistance ± (2% + .05Ω)∆R Shock ± (2% + .05Ω)∆R Vibration ± (2% + .05Ω)∆R Load Life ± (3% + .05Ω)∆R Terminal Strength ± (1% + .05Ω)∆R O R D ERIN G IN F O RM A TI O N Non-Inductive Option (Add N) E = RoHS compliant Example: Std 3 watt, 10K ± 5% = 3CJ10K Wattage 92 Coating "C" for Centohm Tolerance J = 5% (standard) H = 3% F = 1% D = .5% Q = .25% B = .1% Resistance (Ω) use "K" for 1000 multiplier; use "R" for decimal point 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] ∆R values are maximums based on MIL-R-26 testing requirements at 350°C.