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IS250 Datasheet(PDF) 1 Page - Ohmite Mfg. Co. |
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IS250 Datasheet(HTML) 1 Page - Ohmite Mfg. Co. |
1 / 2 page 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 136 I S Series Ultra Low Profile Power Resistors Fea ture S •Heatsinkable •Lowprofile •Highpower •Pulsehandlingcapability •Non-flammable •Lowinductances •Availablewithfast-onterminalsorwireleads characteri S tic S TCR <250ppm (surface temp less than 150°C) Maximum element temperature 365°C 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 200°C surface temp. Power rating dependent on mounting and heatsink ther- mal capacity Hot spot surface temperature 200°C max. Pulsed load at full pulse power rating 1,000 cycles Max. 1%ΔR; (see Fig 1) Mounted on a 0.06°C/W heatsink with forced air cooling, air temperature 25°C (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 S erie S SP eci F icati ONS Power Resistance Rating Range Type (watts) (Ω) Tolerance IS175 175 5Ω to 10KΩ 10%, 20% IS200 200 5Ω to 10KΩ 10%, 20% IS250 250 5Ω to 10KΩ 10%, 20% IS270 270 5Ω to 10KΩ 10%, 20% Derating Construction Resistor Surface Temp., C 250 0 50 100 150 200 40 0 60 80 120 20 100 Termination Dielectric Glass Overcoat Resistive Glaze Stainless Steel u S e S •Brakingresistors •In-rushcurrentlimiter •Bleederresistor •Powerswitching THIS PRODUCT IS DESIGNED FOR USE WITH PROPER HEATSINKING. Maximumbaseplatetemperatureof theresistormustbemonitoredand keptwithinspecifiedlimitstoestab- lishthepowerrating.Besttechnique istoattachathermocoupletothe sideofthebaseplateoftheresistor. •Ruggedconstruction •Ultralowprofilethick- filmonsteel •175Wto270Wsizes •Singlefixingheatsink mountable •Softcharging (continued) |
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