1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com 136 i s series ultra low profile power resistors feature s ? heatsinkable ? low profile ? high power ? pulse handling capability ? non-flammable ? low inductances ? available with fast-on terminals or wire leads characteri stics tcr <250ppm (surface temp less than 150c) maximum element temperature 365c working voltage not to exceed 300v over-voltage rating 5x rated power for up to for up to 1 second resistive element film derating element surface temp. at 100% to 0% power at 200c surface temp. power rating dependent on mounting and heatsink ther - mal capacity hot spot surface temperature 200c max. pulsed load at full pulse power rating 1,000 cycles max. 1%r; (see fig 1) mounted on a 0.06c/w heatsink with forced air cooling, air temperature 25c (ref ah32430 12" long) solder silver solder is recommended for is series resistors. leaching of the silver in the termi - nation will occur if non-silver solder is used. 60/40 tin-lead solders are not recommended for use with the is series product. screw torque 3.5 nm serie s specif ications power resistance rating range type (watts) ( ) tolerance is175 175 5 to 10k 10%, 20% IS200 200 5 to 10k 10%, 20% is250 250 5 to 10k 10%, 20% is270 270 5 to 10k 10%, 20% derating construction % rated power resistor surface temp., oc 250 0 50 100 150 200 40 0 60 80 120 20 100 termination dielectric glass overcoat resistive glaze stainless steel uses ? braking resistors ? in-rush current limiter ? bleeder resistor ? power switching this product is designed for use with proper heatsinking. maximum base plate temperature of the resistor must be monitored and kept within specified limits to estab- lish the power rating. best technique is to attach a thermocouple to the side of the base plate of the resistor. ? rugged construction ? ultra low profile thick- film on steel ? 175w to 270w sizes ? single fixing heatsink mountable ? soft charging (continued)
1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com 137 ordering inform ation termin ation options i s series ultra low profile power resistors IS200c47rke tolerance k = 10% m = 20% resistance 3 digits 47r = 47 termination a = tinned pad b = soldered lead c = fast on terminal wattage 175 200 250 270 rohs compliant series insulated steel dimensions (in/mm) thickness: 0.050 in. .015 / 1.27mm type wattage l 0.2mm w 0.2mm ?d nom. wt. nom (oz/g) is175 175 10 1150 0120 0120 IS200 200 20100 1000 02150 001710 is250 250 001010 277000 02150 17500 is270 270 012200 277000 02150 212070 w l d 10" 14awg 0.250" 0.032" 9mm 9mm solder pad only snag (96s) flying leads push-on connectors
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