SINK-R2 Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Reduced Assembly Cost

R2 Series
For TO-220, TO-247, and TO-264
Ohmite’s 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.
F E AT U R E S
• 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
S E R I E S S P E CI F IC A T I O N S

Heatsink
Part Number
R2V-CT2-38E
R2A-CT2-38E
R2V-CT4-38E
R2A-CT4-38E
R2V-CT6-38E
R2A-CT6-38E
*Free convection at 15W
Surface
Thermal
Area
(in²/mm²)
Weight Resistance*
(oz/g)
(°C/W)
21 / 13,579 0.92 / 26
9.8
21 / 13,579 0.92 / 26
8.6
21 / 13,579 1.02 / 29
9.8
21 / 13,579 1.02 / 29
8.6
21 / 13,579 1.02 / 29
9.8
21 / 13,579 1.02 / 29
8.6
c h ara c ter i st i c s
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
178
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]
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