1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com 180 wc series heatsinks for to-220, to-247, and to-264 devices heatsink for package ohmite resistor surface area thermal part number type series (in 2 ) weight resistance* WC-T2X-38E to-220 , to-247, tbh25, tch35, 17.3 1.48 oz/42g 12c/w to-264 teh100 * at 12 watts heat sink 95% al 2 o 3 spring clip music wire, per astm a228 interface thermal resistance for improvement, use thermal joint com - pound or 0.005 grafoil (tgon 800 by laird) mounting vertical thru-hole mount clip force 13.2 lbf. dielectric withstanding voltage 4kv (from clip to device) the unique design (patent pending) of the wc series heat sinks combines a tin plated, solderable, integral cam clip with an compressed ceramic heat sink body for an all-in-one solution to through-hole mounting of to-220, to-247, and to-264 packages. these self-aligning heat sinks feature solderable feet and an integrated clip with 13.2 (lbf) of force on the cen - ter of the device to enhance thermal performance. feature s ? reduced assembly cost: cam clip and auto-align feature makes fasteners and fixtures obsolete ? maximum repeatability: clamping force of the cam clip is not degraded by repeated loading and unloading ? great electrical characteristics: ceramic material provides great electrical isolation while offering thermal performance similar to aluminum heatsinks ? maximum resistance to shock and vibration: light weight, resilient cam clip locks the component in place and is highly resistant to shock and vibration characteristics serie s specific ations (continued) heat dissipation: aluminum vs. ceramic heat dissipation heat dissipated (watts) WC-T2X-38E (ceramic) r2a-ct4-38e (aluminum) 0 4 2 0 10 8 6 16 18 14 12 40 20 20 100 120 140 160 60 80 case temp rise above ambient in free air (c) 800 350 550 60 heat dissipated (watts) 40 20 0 16.5 0 12 6 120 100 160 140 7 5 3 4 6 200 air v elocity (ft./min.) 80 mounting surface te mp. rise aboveambient (c) thermal resistance from mounting surface to ambient (c/watts)
1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com 181 wc series heatsinks for to-220, to-247, and to-264 devices dimensions (in./ mm 0.3mm) orderin g info rmation 34.0mm 1.2 1.33" 17.60mm .34 0.69" pin diam. 1.5mm 0.06" diam. 2.0mm 0.08" 20.4mm .3 0.80" 3.8mm 0.15" 2.0mm 0.08" 9.2mm 0.36" 21mm +1/-0 0.83" 38.4mm .4 1.51" WC-T2X-38E ceramic heatsink series device height to- packages rohs compliant
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