1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com 2 surface thermal heatsink area weight resistance* part number (in 2 /mm 2 ) (oz/g) (c/w) r2v-ct2-38e 21 / 13,579 5.9/26 9.8 r2a-ct2-38e 21 / 13,579 5.9/26 8.6 R2V-CT4-38E 21 / 13,579 6.4 / 29 9.8 r2a-ct4-38e 21 / 13,579 6.4 / 29 8.6 *free convection at 15w ohmites r2 series (patent pending) heatsink pro - vides a large surface area along with our c series clipping mechanism to attach either a to-220 or to-247 package. the self-aligning features of the clip assure secure attachment and enhanced thermal per - formance. because no screws are required for device mounting, additional fins can be added to the rear side of the heatsink for increased total surface area in a more compact space. features ? reduced assembly cost: c series camming clips make fasteners and fixtures obsolete, along with stray metal filings from tapped holes. ? maximum repeatability: clamping force of the clip is not degraded by repeated loading and unloading. ? maximum heat transfer per unit space: maximum surface area per unit volume and consistent mount - ing force reduces thermal resistance ? maximum resistance to shock and vibration: light weight, resilient clips lock the component in place and are highly resistant to shock and vibration ? maximum reliability: helps prevent short circuits by eliminating metal particles from thread tapping ? rohs compliant r2 series for to-220 and to-247 ch aracteristics heat sink aluminum alloy 6063-t5 or equivalent with either degreased or black anodized finish spring clip music wire, per astm a228 with bright nickel plating solder foot cold-rolled steel, per astm a-366 with pure tin over copper strike. rohs compli - ant interface thermal resistance for improvement, use thermal joint compound, 0.005 grafoil (tgon 800 by laird), or phase change material (hi-flow by bergquist) insulator (optional) sil-pad 900-s, k6 800-s and k10 seri es specific ations thermal management heatsink
1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com 3 heat di ssi pation r2 series for to-220 and to-247 dimensions how to order thermal management heatsink to-247 with no thermal interface material 300 100 200 600 400 500 900 700 800 heat dissipated (watts) 0 4 2 0 10 8 6 16 18 14 12 40 20 20 100 120 140 160 0 1000 air velocity (ft./min.) 60 80 2.5 1.5 0.5 0 2 1 3 3.5 thermal resistance case to ambient (c/w) case temp rise above ambient in free air (c) ?0.05" typ. (1.3mm) 2x ?0.08" (2.0mm) 1.38" (35.2mm) 0.80" (20.3mm) 0.18" (4.6mm) 0.87" (22.0mm) 1.5" (38.0mm) 0.16" (4.25mm) 0.39" (10.0mm) ct2: 0.55" (14mm) ct4: 0.71" (18mm) to-247: 0.69" (17.6mm) to-220: 0.47" (11.9mm) to-247: 0.69" (17.6mm) to-220: 0.47" (11.9mm) r2v-ct2-38e series r2 clip c = camming clip height (mm) finish a = black anodized v = degreased package t2 = to220 t4 = to247 rohs compliant
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