R2 HeatSink Series
Download Datasheet
For TO-220 and TO-247



Heatsink Part Number Surface Area (in2/mm2) Weight (oz/g) Thermal Resistance* (°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

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.

FEATURES SPECIFICATIONS
  • 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
  • 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

HEAT DISSIPATION
TO-247 with no thermal interface material