1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
178
Surface Thermal
Heatsink Area Weight Length Resistance*
Part Number (in
2
/mm
2
) (oz/g) (mm) (°C/W)
CR101-25 20 / 12,785 1.0 / 28 25 7.6
CR101-50 40 / 25,570 2.0 / 57 50 5.3
CR101-75 60 / 38,355 3.0 / 85 75 4.2
CR201-25 36.8 / 23,705 1.8 / 52 25 4.7
CR201-50 73.5 / 47,409 3.6 /103 50 3.3
CR201-75 110 / 71,114 5.4 /155 75 2.6
CR301-25 19.5 / 12,595 1.38 /39 25 8.1
CR301-50 39.0 / 25,189 2.75 /78 50 5.7
CR301-75 58.5 / 37,784 4.12/117 75 4.5
CR401-25 31.7 / 20,477 2.26/63.5 25 5.4
CR401-50 63.5 / 40,954 4.48/127 50 3.8
CR401-75 95.2 / 61,431 6.74/191 75 3.0
*Natural convection thermal resistance based on 70 °C Temp rise above ambient.
Ohmite introduces the CR-series, configurable and
patented (Pat. Pending) high performance, heatsinks
with universal cam-clip for TO-247, TO-264, and
other packages. This proprietary heat sink provides
tool and fixture free assembly operation with its Pat
Pending cam clip system. The CR series heatsinks
are comparable to some AAVID popular MAX-clip
heat sinks in footprint and thermal performance. It is
the ideal type of heat sink for high power density and
small size electronic packaging with forced convec
tion cooling.
FEATURES
•Minimumassemblycostandlabor:Spring Clips
make the mounting holes, fasteners, tools and fix-
tures obsolete in assembly operations & reduce
costs.
•MaximumRepeatability:Constant spring force
over repeated assembly/disassembly
•MaximumReliability:Resilient spring action locks
electronic component in place. Fewer parts in
assembly and no fasteners and washers required.
Prevent short circuit by eliminating metal particles
generated from hardware or thread tapping
•Design Flexibility: Maximum flexibility for dynamic
device locations and power up grading. “Configure-
to-Fit” gives designers total freedom to configure
heat sink needed to fit their dynamic design envi-
ronments.
CR Series
Heatsinkwithuniversalcam-clip
CHARACTERISTICSSERIES SPECIFICATIONS
(continued)
HOW TO ORDER
Heat Sink
Aluminum Alloy 6063-T5 or Equivalent
with either degreased or black anod-
ized 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.
Insulator
(Optional) Sil-Pad 900-S, K6 800-S
and K10
2.0
2.75
2.5
2.25
1.0
0.75
0.5
0.25
1.25
1.5
1.75
12001000800400 6000 200
Thermal Resistance (°C/W)
Air Velocity (ft./min.)
CR101
CR301
CR201
CR401
Thermal Performance
Two TO-247 heat sources uniformly spaced on the heat Sink,
L= 1.97” [50mm] and total of 10W Power Dissipation
CR101-25-AE
Series
CLA-TO-21E
Length (mm)
25, 50, 75
Cam Clip
ordered separately
Coating
A = Anodized
V = degreased
Extrusion style
101, 201,301,401
RoHS Compliant
