CR Series
Heatsink with universal cam-clip
FEATURES
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
Ohmite introduces the CR-series, configurable and
Maximum Reliability: Resilient spring action locks
patented (Pat. Pending) high performance, heatsinks
electronic component in place. Fewer parts in
with universal cam-clip for TO-247, TO-264, and
assembly and no fasteners and washers required.
other packages. This proprietary heat sink provides
Prevent short circuit by eliminating metal particles
tool and fixture free assembly operation with its Pat
generated from hardware or thread tapping
Pending cam clip system. The CR series heatsinks
Design Flexibility: Maximum flexibility for dynamic
are comparable to some AAVID popular MAX-clip
device locations and power up grading. Configure-
heat sinks in footprint and thermal performance. It is
to-Fit gives designers total freedom to configure
the ideal type of heat sink for high power density and
heat sink needed to fit their dynamic design envi-
small size electronic packaging with forced convec
ronments.
tion cooling.
SERiES SPECiFiCATiONS ChARACTERiSTiCS
Surface Thermal
Heat Sink Aluminum Alloy 6063-T5 or Equivalent
Heatsink Area Weight Length Resistance*
with either degreased or black anod-
2 2
Part Number (in /mm ) (oz/g) (mm) (C/W) ized finish.
CR101-25 20 / 12,785 1.0 / 28 25 7.6
Spring Clip Music Wire, Per ASTM A228 with
CR101-50 40 / 25,570 2.0 / 57 50 5.3 bright nickel plating
CR101-75 60 / 38,355 3.0 / 85 75 4.2
Solder Foot Cold-rolled Steel, Per ASTM A-366
CR201-25 36.8 / 23,705 1.8 / 52 25 4.7
with pure tin over copper strike. RoHS
compliant.
CR201-50 73.5 / 47,409 3.6 /103 50 3.3
CR201-75 110 / 71,114 5.4 /155 75 2.6
(Optional) Sil-Pad 900-S, K6 800-S
Insulator
and K10
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 Thermal Performance
CR401-25 31.7 / 20,477 2.26/63.5 25 5.4
2.75
CR401-50 63.5 / 40,954 4.48/127 50 3.8
2.5
CR401-75 95.2 / 61,431 6.74/191 75 3.0
2.25
*Natural convection thermal resistance based on 70 C Temp rise above ambient.
2.0
1.75
hOw TO ORdER
1.5
CR101
RoHS Compliant CR301
1.25
1.0
CR101-25-AE
CLA-TO-21E
0.75
Series Extrusion style Length (mm) Coating CR401
Cam Clip
101, 201,301,401 25, 50, 75 A = Anodized ordered separately
CR201
0.5
V = degreased
0.25
0 200 400 600 800 1000 1200
Air Velocity (ft./min.)
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 Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com [email protected]
Thermal Resistance (C/W)0.43"
(10.9mm)
CR Series
Heatsink with universal cam-clip
dimENSiONS
1.06"
(27.0mm)
Y X
0.105"
(2.67mm)
1.06"
0.18"
CR201
(27.0mm)
(4.5mm)
0.67"
1.97"
1.34"
(17.0mm)
(50mm)
(34mm)
0.55"
M3
2x 0.08"
0.98" (13.995mm)
(2.0mm)
(25mm)
L
0.89"
(22.5mm)
Y X
0.105"
0.24"
(2.67mm)
0.18"
(6.025mm)
(4.55mm)
2.95"
(75mm)
0.19"
1.34"
(4.95mm)
CR101
(34mm)
0.91"
1.19"
(23.2mm)
(30.2mm)
1.1"
(27.7mm)
2x 0.08"
(2.0mm)
L
0.19" 0.23"
(5.778mm)
(4.95mm)
1.18"
(30mm)
M4X0.7
Y X
0.105"
(2.67mm)
CR401
CR301
0.157"
1.18"
(4.0mm)
1.57"
(30mm)
(40mm)
2.36"
0.59" 0.11"
(60mm)
M3
(2.79mm)
(15mm)
0.24"
2x 0.08"
(6mm)
(2.0mm)
0.98"
L
(25mm)
1.18"
(30mm)
1.08"
(27.5mm)
2.95"
Y X
0.105"
(75mm)
(2.67mm)
0.32"
(8mm)
0.157"
(4.0mm)
1.18"
0.98"
1.57"
(30mm)
(25mm)
0.75" (40mm)
1.08"
Clip
(19.1mm)
(27.5mm)
0.197"
0.57" (5.0mm)
0.79"
(14.5mm)
(20mm)
0.39"
(10mm) 0.197"
0.19"
(5.0mm)
(4.8mm) 2x 0.08"
L
0.78" (2.0mm)
(19.8mm)
1.39"
(35.3mm)
rev 2/18-1
1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com [email protected] 179