R2A-CT4-38E

HEATSINK R2 Series F E AT U R E S Ohmite’s R2 Series (patent pending) heatsink provides 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 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. • 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 mounting 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 S E R i E S S P E c i F i c AT i O N S Heatsink Part Number R2V-CT2-38E R2A-CT2-38E R2V-CT4-38E R2A-CT4-38E *Free convection at 15W Surface Area (in2/mm2) 21 / 13,579 21 / 13,579 21 / 13,579 21 / 13,579 Weight (oz/g) 5.9/26 5.9/26 6.4 / 29 6.4 / 29 Thermal Resistance* (°C/W) 9.8 8.6 9.8 8.6 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 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 2 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com THERMAL MANAGEMENT For TO-220 and TO-247 HEATSINK R2 Series h E AT D i S S i PAT i O N TO-247 with no thermal interface material Case Temp Rise Above Ambient in Free Air (°C) Air Velocity (ft./min.) 160 140 120 100 80 60 40 20 0 0 2 4 6 8 10 12 14 Heat Dissipated (watts) 16 18 20 1.5 1 0.5 0 0 100 200 300 400 500 600 700 800 900 1000 3.5 3 2.5 2 Thermal Resistance Case to Ambient (°C/W) DimENSiONS TO-247: 0.69" (17.6mm) TO-220: 0.47" (11.9mm) 2x ø0.08" (2.0mm) 0.18" (4.6mm) ø0.05" typ. (1.3mm) 0.87" (22.0mm) 0.39" (10.0mm) 0.80" (20.3mm) 1.38" (35.2mm) 1.5" (38.0mm) CT2: 0.55" (14mm) CT4: 0.71" (18mm) 0.16" (4.25mm) TO-247: 0.69" (17.6mm) TO-220: 0.47" (11.9mm) hOw TO ORDER Series R2 Clip C = camming clip RoHS Compliant R2V-CT2-38E Finish Package Height A = black anodized T2 = TO220 (mm) V = degreased T4 = TO247 3 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com THERMAL MANAGEMENT For TO-220 and TO-247