IS270C25RKE Ohmite

THICK FILM IS Series Ultra Low Profile Power Resistors FeatureS Heatsinkable Available with fast-on ter- minals or wire leads Low profile Rugged construction High power Ultra low profile thick-film Pulse handling capability on steel Non-flammable 175W to 270W sizes Low inductances Single fixing heatsink mountable uSeS Braking resistors THIS PRODUCT IS DESIGNED In-rush current limiter FOR USE WITH PROPER HEATSINKING. Maximum base plate temperature of the resistor must be monitored and kept Bleeder resistor within specified limits to establish the power rating. Best technique is to attach a Power switching thermocouple to the side of the base plate of the resistor. Soft charging SerieS SPeciFicatiONS Power Resistance Construction Rating Range Termination Glass Overcoat Dielectric Type (watts) () Tolerance Resistive Glaze IS175 175 5 to 10K 10%, 20% Stainless Steel IS200 200 5 to 10K 10%, 20% IS250 250 5 to 10K 10%, 20% IS270 270 5 to 10K 10%, 20% characteriSticS TCR <250ppm (surface temp less than Derating 150C) 120 Hot spot surface temperature 200C max. 100 Working voltage Not to exceed 300V 80 Over-vlotage rating 5X rated power for up to for up to 60 1 second Resistive element Thick Film 40 Derating element surface temp. at 100% to 20 0% power at 200C surface temp. 0 0 50 100 150 200 250 Power rating dependent on mounting and heat- Resistor Surface Temp., Co sink thermal capacity Maximum element 365C temperature Pulsed load at full pulse Max. 1%R (see Fig 1) power rating 1,000 cycles Mounted on a 0.06C/W heatsink with forced air cooling, air tempera- ture 25C (ref AH32430 12 long) 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com 1 HEAT SINKABLE % Rated PowerTHICK FILM IS Series Ultra Low Profile Power Resistors DiMeNSiONS (in/mm) L Thickness: 0.04 in. / 0.9mm .1 Type Wattage L 0.1mm W 0.1mm D nom. Wt. nom (oz/g) W IS175 175 1.94/49.30 1.41/35.90 0.13/3.20 0.44/12.60 IS200 200 2.40/61.00 1.60/40.60 0.21/5.30 0.60/17.10 IS250 250 4.00/101.60 2.76/70.00 0.21/5.30 1.78/50.80 IS270 270 4.80/122.00 2.76/70.00 0.21/5.30 2.12/60.70 D terMiNatiON OPtiONS Solder pad only Flying leads Push-on SnAg (96S) connectors 9mm 0.250 0.032 10 14AWG 9mm OrDeriNG iNFOrMatiON Tolerance K = 10% RoHS M = 20% Compliant IS200C47RKE Series Wattage Termination Resistance Insulated 175 A = Tinned pad 3 digits Steel 200 B = Soldered lead 47R = 47 250 C = Fast on terminal 270 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com 2 HEAT SINKABLE