OHMITE R2A-CT2-38E

HEATSINK
For TO-220 and TO-247
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 CI F IC A T I O N S
Heatsink
Part Number
R2V-CT2-38E
R2A-CT2-38E
R2V-CT4-38E
R2A-CT4-38E
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
*Free convection at 15W
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 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 • [email protected]
THERMAL
MANAGEMENT
R2 Series
HEATSINK
R2 Series
THERMAL
MANAGEMENT
For TO-220 and TO-247
Heat D i ss i pat i on
TO-247 with no thermal
interface material
Air Velocity (ft./min.)
0
160
100
200
300
400
500
600
700
800
900 1000
3.5
3
120
2.5
100
2
80
1.5
60
1
40
Thermal Resistance
Case to Ambient (°C/W)
Case Temp Rise Above
Ambient in Free Air (°C)
140
0.5
20
0
0
0
2
4
6
8
10
12
14
Heat Dissipated (watts)
16
18
20
d i m ens i ons
TO-247: 0.69" (17.6mm)
TO-220: 0.47" (11.9mm)
2x ø0.08"
(2.0mm)
0.18"
(4.6mm)
0.39"
(10.0mm)
0.80"
(20.3mm)
1.38"
(35.2mm)
ø0.05" typ.
(1.3mm)
0.87"
(22.0mm)
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)
h o w 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 • [email protected]