WC Series Heatsinks For TO-220, TO-247, and TO-264 devices FeatureS 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 The unique design (patent pending) of the WC Series provides great electrical isolation while offering heat sinks combines a tin plated, solderable, integral thermal performance similar to aluminum heatsinks cam clip with an compressed ceramic heat sink body Maximum resistance to shock and vibration: light for an all-in-one solution to through-hole mounting weight, resilient cam clip locks the component in of TO-220, TO-247, and TO-264 packages. These place and is highly resistant to shock and vibration 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. SerieS SPeCiFiCatiONS Heatsink For Package Ohmite Resistor Surface Area Thermal 2 Part Number Type Series (in ) 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 CHaraCteriStiCS 95% Al2O3 Heat Sink 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 13.2 lbf. Clip Force Dielectric withstanding voltage 4KV (from clip to device) Heat Dissipation Heat Dissipation: Aluminum vs. Ceramic Air Velocity (ft./min.) 200 350 550 800 160 160 7 140 140 120 6 120 WC-T2X-38E (ceramic) 100 100 R2A-CT4-38E (aluminum) 80 80 5 60 60 40 4 40 20 20 0 3 0 0 6 12 16.5 0 2 4 6 8 10 12 14 16 18 20 Heat Dissipated (watts) Heat Dissipated (watts) (continued) 180 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com Mounting Surface Temp. Rise aboveAmbient (C) Thermal Resistance from Mounting Surface to Ambient (C/watts) Case Temp Rise Above Ambient in Free Air (C)WC Series Heatsinks For TO-220, TO-247, and TO-264 devices dimeNSiONS (in./mm 0.3mm) 34.0mm 1.2 20.4mm .3 1.33 0.80 38.4mm .4 1.51 3.8mm Pin diam. 17.60mm .34 0.15 1.5mm 0.69 0.06 21mm +1/-0 0.83 9.2mm 0.36 diam. 2.0mm 2.0mm 0.08 0.08 OrderiNg iNFOrmatiON WC-T2X-38E Ceramic TO- Device RoHS Heatsink series Packages height Compliant 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com 181