C Series Heatsink

C Series
F E AT U R E S
TO-126, TO-247, TO-220
and TO-264 Package Heatsinks
Ohmite introduces the C series (Pat. Pending). This
series offers high performance, low cost and a
compact heat sink with an integrated camming clip
system for TO-126, TO-220, TO-247 and TO-264
devices. This powerful heat sink provides tool and
fixture free assembly operation, largest surface areas
and smallest space occupation. It is the ideal type of
heat sink for high power density and small size (1U
or 2U) electronic packaging with forced convection
cooling.
•Minimum assembly cost and labor Spring Clips
make the mounting holes, fasteners, tools and
fixtures obsolete in assembly operations & reduce
costs.
•Maximum Thermal Transfer Maximum surface area
per unit volume, efficient cooling fins & consistent
mounting force reduces thermal resistance.
•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 upgrading. “Configureto-Fit” gives designers total freedom to configure
heat sink needed to fit into a multitude design environments.
S E R I E S S P E C I F I C AT I O N S
c h aracter i st i cs
Surface
Heatsink
Area
Weight Length “L”
Part Number
(in2/mm2)
(oz/g)
(mm)
C247-025
11 / 7,312
0.5 / 15
25
C247-050 23 / 14,858
1.1 / 31
50
C247-075 34 / 21,655
1.6 / 45
75
C264-030
13 / 8,774
0.7 / 19
30
C264-058 25 / 16,963
1.35 / 37
58
C264-085 37 / 24,861
1.97 / 54
85
C220-025
11 / 7,312
0.5 / 15
25
C220-050 23 / 14,858
1.1 / 31
50
C220-075 34 / 21,655
1.6 / 45
75
C126-025 10.2 / 6,559 0.45 / 12.7
25
C126-040 16.3 / 10,495 0.72 / 20.3
40
C126-050 20.4 / 13,119 0.90 / 25.4
50
C126-075 30.6 / 21,655 1.35 / 38.1
75
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 for improvement, use thermal joint
Thermal compound, 0.005 Grafoil (TGon 800
Resistance by Laird), or phase change material
(Hi-Flow by Bergquist)
Insulator (Optional) Sil-Pad 900-S, K6 800-S
and K10 by Bergquist
Heat D i ss i pat i on
Heat dissipation is the total for ALL DEVICES attached to heatsink.
800
C247-025-1AE (1 device)
C247-050-2AE (2 devices)
C247-075-3AE (3 devices)
100
1000
9
8
7
6
80
5
60
4
3
40
2
20
1
0
0
5
10
Heat Dissipated, total for ALL devices (watts)
0
15
200
38
400
Air Velocity (ft./min.)
600
800
1000
TO-126/CE-S102 (25mm long)
one device w/Sil-pad 900s
36
12
34
10
32
30
8
28
6
26
24
4
22
2
3
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
4
5
6
7
8
Total Heat Dissipated (watts)
167
9
0
10
Avg. Thermal Resistance from Mounting
Surface to Ambient (oC/watts)
Air Velocity (ft./min.)
600
Average Heat Sink Temp. Rise
above Ambient (oC)
120
400
Thermal Resistance from Mounting
Case to Ambient (°C/watts)
Case Temp. Rise above Ambient (°C)
200
140
(continued)
C Series
TO-126, TO-247, TO-220 and TO-264 Package Heatsinks
d i m ens i ons
0.77"
(19.6mm)
with TO-126
0.806"
with TO-247
or TO-264
(20.47mm)
0.73"
(18.6mm)
0.785"
with TO-220
(19.94mm)
TO-247
0.71"
(18mm)
TO-126 & TO-220
0.57"
(14.48mm)
1.50"
(38mm)
1.12"
(28.5mm)
1.28"
(32.5mm)
0.73"
(18.5mm)
0.10"
(2.5mm)
0.100"
(2.5mm)
TO-264
0.35"
(8.89mm)
0.10"
(2.5mm)
0.100"
(2.54mm)
0.385"
(9.78mm)
L-0.16" (4.06mm)
(all models)
0.385"
(9.78mm)
0.73"
(18.54mm)
0.08"
(2.08mm)
(all models)
Land Pattern
X and Y dimensions at user discretion
ø 0.07" pth typ
(1.8mm)
CL
CL
Y
X
ø 0.10" pth
(2.5mm)
TO-126
0.71"
0.73"
(18.0mm) (18.6mm)
0.18"
(4.6mm)
L – 0.16"(4.06mm)
L
0.08"
(2.0mm)
h o w to order
RoHS Compliant
C247-025-1AE
Series
Clip size
Length
(mm)
No. of Finish
clips A = black anodized
V = degreased
Standard part numbers
No Finish (degreased)
No. of Clips
C247-025-1VE
C247-050-2VE
C247-075-3VE
C247-025-1AE
C247-050-2AE
C247-075-3AE
1
2
3
C264-030-1VE
C264-058-2VE
C264-085-3VE
C264-030-1AE
C264-058-2AE
C264-085-3AE
1
2
3
C220-025-1VE
C220-050-2VE
C220-075-3VE
C220-025-1AE
C220-050-2AE
C220-075-3AE
1
2
3
C126-025-1VE
C126-040-2VE
C126-025-1AE
C126-040-2AE
1
2
Packaging: Bulk
168
Black Anodized
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com