THICK FILM IS Series Ultra Low Profile Power Resistors HEAT SINKABLE F e at u r e s •Heatsinkable •Low profile •High power •Pulse handling capability •Non-flammable •Low inductances •Available with fast-on terminals or wire leads •Rugged construction •Ultra low profile thick-film on steel •175W to 270W sizes •Single fixing heatsink mountable uses •Braking resistors •In-rush current limiter •Bleeder resistor •Power switching •Soft charging 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 establish the power rating. Best technique is to attach a thermocouple to the side of the base plate of the resistor. S ERIE S S P ECI F ICATI O N S Type IS175 IS200 IS250 IS270 Power Rating (watts) 175 200 250 270 Resistance Range (Ω) 5Ω to 10KΩ 5Ω to 10KΩ 5Ω to 10KΩ 5Ω to 10KΩ Construction Tolerance 10%, 20% 10%, 20% 10%, 20% 10%, 20% Dielectric Termination Glass Overcoat Resistive Glaze Stainless Steel characteristics TCR <250ppm (surface temp less than 150°C) Derating 120 Working voltage Not to exceed 300V Over-vlotage rating 5X rated power for up to for up to 1 second Resistive element Thick Film % Rated Power Hot spot surface temperature 200°C max. Derating element surface temp. at 100% to 0% power at 200°C surface temp. Power rating dependent on mounting and heatsink thermal capacity Maximum element 365°C temperature Pulsed load at full pulse Max. 1%ΔR; (see Fig 1) power rating 1,000 cycles Mounted on a 0.06°C/W heatsink with forced air cooling, air temperature 25°C (ref AH32430 12" long) 1 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] 100 80 60 40 20 0 0 50 100 150 200 Resistor Surface Temp., oC 250 THICK FILM IS Series HEAT SINKABLE Ultra Low Profile Power Resistors d i m e ns i ons (in/mm) Thickness: 0.04 in. / 0.9mm ±.1 Type IS175 IS200 IS250 IS270 L Wattage L ±0.1mm W ±0.1mm 175 1.94/49.30 1.41/35.90 200 2.40/61.00 1.60/40.60 250 4.00/101.60 2.76/70.00 270 4.80/122.00 2.76/70.00 ØD nom. Wt. nom (oz/g) 0.13/3.20 0.44/12.60 0.21/5.30 0.60/17.10 0.21/5.30 1.78/50.80 0.21/5.30 2.12/60.70 W D T e r m i n a t i on O p t i ons Solder pad only SnAg (96S) Flying leads Push-on connectors 9mm 0.250" 10" 14AWG 9mm O R D ERI N G I N F O R M ATI O N 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 = 47Ω 250 C = Fast on terminal 270 2 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] 0.032"