1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? ww w.ohmite.com ? info@ohmite.com 168 surface heatsink area weight length l part number (in 2 /mm 2 ) (oz/g) (mm) c247-025 11 / 7,312 0.5 / 15 25 c247-050 23 / 14,858 1.1 / 31 50 c247-075 34 / 21,655 1.6 / 45 75 c264-030 13 / 8,774 0.7 / 19 30 c264-058 25 / 16,963 1.35 / 37 58 c264-085 37 / 24,861 1.97 / 54 85 c220-025 11 / 7,312 0.5 / 15 25 c220-050 23 / 14,858 1.1 / 31 50 c220-075 34 / 21,655 1.6 / 45 75 c126-025 10.2 / 6,559 0.45 / 12.7 25 c126-040 16.3 / 10,495 0.72 / 20.3 40 c126-050 20.4 / 13,119 0.90 / 25.4 50 c126-075 30.6 / 21,655 1.35 / 38.1 75 ohmite introduces the c series (pat. pending). this series offers high performance, low cost and a compact heat sink with an integrated camming clip system for to-126, to-220, to-247 and to-264 devices. this powerful heat sink provides tool and fixture free assembly operation, largest surface areas and smallest space occupation. it is the ideal type of heat sink for high power density and small size (1u or 2u) electronic packaging with forced convection cooling. features ? minimum assembly cost and labor spring clips make the mounting holes, fasteners, tools and fixtures obsolete in assembly operations & reduce costs. ? maximum thermal transfer maximum surface area per unit volume, efficient cooling fins & consistent mounting force reduces thermal resistance. ? maximum repeatability constant spring force over repeated assembly/disassembly. ? maximum reliability resilient spring action locks electronic component in place. fewer parts in assembly and no fasteners and washers required. prevent short circuit by eliminating metal particles generated from hardware or thread tapping. ? design flexibility maximum flexibility for dynamic device locations and power upgrading. configure- to-fit gives designers total freedom to configure heat sink needed to fit into a multitude design envi - ronments. c series to-126, to-247, to-220 and to-264 package heatsinks characteristics heat sink aluminum alloy 6063-t5 or equivalent with either degreased or black anod - ized 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 compliant. 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 by bergquist seri es specifi cations heat di ssi pation case temp. rise above ambient (c) heat dissipated, total for all devices (watts) 120 80 0 51 0 100 15 0 140 thermal resistance from mounting case to ambient (c/watts) 2 1 0 3 8 7 9 600 200 400 1000 60 40 20 5 6 4 air velocity (ft./min.) 800 c247-025-1ae (1 device) c247-050-2ae (2 devices) c247-075-3ae (3 devices) heat dissipation is the total for all devices attached to heatsink. average heat sink temp. rise above ambient (c) total heat dissipated (watts) 36 32 22 6 7 8 9 10 34 2 3 4 5 38 avg. thermal resistance from mounting surface to ambient (c/watts) 12 10 600 200 400 1000 30 28 24 26 6 8 4 air velocity (ft./min.) 800 to-126/ce-s102 (25mm long) one device w/sil-pad 900s (continued)
1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? ww w.ohmite.com ? info@ohmite.com 169 land pattern x and y dimensions at user discretion l ? 0.16"(4.06mm) ? 0.07" pth typ (1.8mm) ? 0.10" pth (2.5mm) c l c l y x 0.71" (18.0mm) t o-126 0.73" (18.6mm ) 0.08" (2.0mm) 0.18" (4.6mm) l c247-025-1ae series no. of clips clip size finish a = black anodized v = degreased length (mm) rohs compliant c series to-126, to-247, to-220 and to-264 package heatsinks standard part numbers no finish (degreased) black anodized no. of clips c247-025-1ve c247-025-1ae 1 c247-050-2ve c247-050-2ae 2 c247-075-3ve c247-075-3ae 3 c264-030-1ve c264-030-1ae 1 c264-058-2ve c264-058-2ae 2 c264-085-3ve c264-085-3ae 3 c220-025-1ve C220-025-1AE 1 c220-050-2ve c220-050-2ae 2 c220-075-3ve c220-075-3ae 3 c126-025-1ve c126-025-1ae 1 c126-040-2ve c126-040-2ae 2 packaging: bulk 0.71" (18mm) 1.50" (38mm) 1.12" (28.5mm) 0.10" (2.5mm) 0.785" with to-220 (19.94mm) with to-126 to-126 & to-220 to-247 to-264 0.806" with to-247 or to-264 (20.47mm) 0.385" (9.78mm) 0.100" (2.54mm) 0.73" (18.6mm) 1.28" (32.5mm) 0.73" (18.5mm) 0.10" (2.5mm) 0.77" (19.6mm) 0.385" (9.78mm) 0.100" (2.5mm) l-0.16" (4.06mm) (all models) 0.35" (8.89mm) 0.08" (2.08mm) (all models) 0.57" (14.48mm) 0.73" (18.54mm)
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