R2 Series For TO-220, TO-247, and TO-264 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 Ohmites R2 Series (patent pending) heatsink pro- weight, resilient clips lock the component in place vides a large surface area along with our C Series and are highly resistant to shock and vibration clipping mechanism to attach to a TO-220, TO-247, Maximum Reliability: helps prevent short circuits or TO-264 package. The self-aligning features of the by eliminating metal particles from thread tapping clip assure secure attachment and enhanced thermal performance. Because no screws are required for RoHS compliant device mounting, additional fins can be added to the rear side of the heatsink for increased total surface area in a more compact space. SERiES SPEciFicATiONS Surface Thermal Heatsink Area Weight Resistance* 2 2 Part Number (in /mm ) (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 chARAcTERiSTicS 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 for improvement, use thermal joint compound, 0.005 Grafoil (TGon 800 by Laird), Interface Thermal Resistance or phase change material (Hi-Flow by Bergquist) Insulator (Optional) Sil-Pad 900-S, K6 800-S and K10 (continued) 178 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.comR2 Series For TO-220, TO-247, and TO-264 hEAT DiSSiPATiON Air Velocity (ft./min.) TO-247 with no thermal 0 100 200 300 400 500 600 700 800 900 1000 interface material 160 3.5 140 3 120 2.5 100 2 80 1.5 60 1 40 0.5 20 0 0 0 2 4 6 8 10 12 14 16 18 20 Heat Dissipated (watts) DimENSiONS CT4 & CT6: 0.69 .01 (17.6mm) CT2: 0.47 .01 (11.9mm) 2x 0.08 .01 (2.0mm) 0.18 .01 (4.6mm) 0.39 .01 (10.0mm) Holes on PCB 0.05 typ. 0.80 .01 (1.3mm) (20.3mm) 0.87 .01 1.38 .02 (22.0mm) (35.2mm) 1.5 .02 (38.0mm) 1.44 .02 (36.5mm) CT2: 0.55 .02 (14mm) CT4 & CT6: 0.71 .02 (18mm) 0.14 .025 CT4 & CT6: 0.69 .02 (17.6mm) Solder lead protrusion over PCB (3.6mm) CT2: 0.47 .02 (11.9mm) meets class 2 or 3 of IPC 610 STD hOw TO ORDER Series Clip RoHS R2 C = camming clip Compliant R2V-CT2-38E Finish Package Height A = black anodized T2 = TO220 (mm) V = degreased T4 = TO247 T6 = TO264 rev 4/19-1 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com 179 Case Temp Rise Above Ambient in Free Air (C) Thermal Resistance Case to Ambient (C/W)