1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? ww w.ohmite.com ? info@ohmite.com 178 surface thermal heatsink area weight resistance* part number (in 2 /mm 2 ) (oz/g) (c/w) r2v-ct2-38e 21 / 13,579 0.92 / 26 9.8 r2a-ct2-38e 21 / 13,579 0.92 / 26 8.6 r2v-ct4-38e 21 / 13,579 1.02 / 29 9.8 r2a-ct4-38e 21 / 13,579 1.02 / 29 8.6 r2v-ct6-38e 21 / 13,579 1.02 / 29 9.8 r2a-ct6-38e 21 / 13,579 1.02 / 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 to a to-220, to-247, or to-264 package. the self-aligning features of the clip assure secure attachment and enhanced thermal performance. 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, to-247, and to-264 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 (continued)
1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? ww w.ohmite.com ? info@ohmite.com 179 heat di ssi pation r2 series for to-220, to-247, and to-264 dimensions how to order 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) 0.14" (3.6mm) 1.44" (36.5mm) 0.39" (10.0mm) ct2: 0.55" (14mm) ct4 & ct6: 0.71" (18mm) ct4 & ct6: 0.69" (17.6mm) ct2: 0.47" (11.9mm) ct4 & ct6: 0.69" (17.6mm) ct2: 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 t6 = to264 rohs compliant
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