CR Series
Heatsink with universal cam-clip
F E AT U R E S
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.
S E R i E S S P E C i F i C AT i O N S
• Minimum assembly cost and labor: Spring
Clips
make the mounting holes, fasteners, tools and fix-
tures obsolete in assembly operations & reduce
costs.
• Maximum Repeatability: Constant
spring force
over repeated assembly/disassembly
• Maximum Reliability: 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.
ChARACTERiSTiCS
Heat Sink
Aluminum Alloy 6063-T5 or Equivalent
with either degreased or black anod-
ized finish.
*Natural convection thermal resistance based on 70 °C Temp rise above ambient.
Thermal Resistance (°C/W)
Heatsink
Part Number
CR101-25
CR101-50
CR101-75
CR201-25
CR201-50
CR201-75
CR301-25
CR301-50
CR301-75
CR401-25
CR401-50
CR401-75
Surface
Area
(in
2
/mm
2
)
20 / 12,785
40 / 25,570
60 / 38,355
36.8 / 23,705
73.5 / 47,409
110 / 71,114
19.5 / 12,595
39.0 / 25,189
58.5 / 37,784
31.7 / 20,477
63.5 / 40,954
95.2 / 61,431
Weight
(oz/g)
1.0 / 28
2.0 / 57
3.0 / 85
1.8 / 52
3.6 /103
5.4 /155
1.38 /39
2.75 /78
4.12/117
2.26/63.5
4.48/127
6.74/191
Thermal
Length Resistance*
(mm)
(°C/W)
25
7.6
50
5.3
75
4.2
25
4.7
50
3.3
75
2.6
25
8.1
50
5.7
75
4.5
25
5.4
50
3.8
75
3.0
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
Thermal Performance
2.75
2.5
2.25
2.0
1.75
1.5
1.25
1.0
0.75
0.5
0.25
0
200
CR201
400
600
800
Air Velocity (ft./min.)
1000
1200
CR401
CR101
CR301
hOw TO ORdER
RoHS Compliant
CR101-25-AE
Series
Extrusion style
101, 201,301,401
Length
(mm)
Coating
25, 50, 75
A = Anodized
V = degreased
CLA-TO-21E
Cam Clip
ordered separately
Two TO-247 heat sources uniformly spaced on the heat Sink,
L= 1.97” [50mm] and total of 10W Power Dissipation
(continued)
178
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com