FEATURES
C Series
Minimum assembly cost and labor Spring Clips
make the mounting holes, fasteners, tools and
TO-126, TO-247, TO-220
fixtures obsolete in assembly operations & reduce
and TO-264 Package Heatsinks
costs.
Maximum Thermal Transfer Maximum sur face 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
Ohmite introduces the C series (Pat. Pending). This
electronic component in place. Fewer parts in
series offers high performance, low cost and a
assembly and no fasteners and washers required.
compact heat sink with an integrated camming clip
Prevent short circuit by eliminating metal particles
system for TO-126, TO-220, TO-247 and TO-264
generated from hardware or thread tapping.
devices. This powerful heat sink provides tool and
fixture free assembly operation, largest surface areas Design Flexibility Maximum flexibility for dynamic
and smallest space occupation. It is the ideal type of device locations and power upgrading. Configure-
heat sink for high power density and small size (1U to-Fit gives designers total freedom to configure
or 2U) electronic packaging with forced convection heat sink needed to fit into a multitude design envi-
cooling. ronments.
SERiES SPECiFiCATiONS
ChARACTERiSTiCS
Surface
Aluminum Alloy 6063-T5 or Equivalent
Heat Sink
Heatsink Area Weight Length L
2 2
with either degreased or black anod-
Part Number (in /mm ) (oz/g) (mm)
ized finish.
C247-025 11 / 7,312 0.5 / 15 25
C247-050 23 / 14,858 1.1 / 31 50
Spring Clip Music Wire, Per ASTM A228 with
C247-075 34 / 21,655 1.6 / 45 75
bright nickel plating
C264-030 13 / 8,774 0.7 / 19 30
Cold-rolled Steel, Per ASTM A-366
Solder Foot
C264-058 25 / 16,963 1.35 / 37 58
with pure tin over copper strike. RoHS
C264-085 37 / 24,861 1.97 / 54 85
compliant.
C220-025 11 / 7,312 0.5 / 15 25
Interface for improvement, use thermal joint
C220-050 23 / 14,858 1.1 / 31 50
Thermal compound, 0.005 Grafoil (TGon 800
C220-075 34 / 21,655 1.6 / 45 75
Resistance by Laird), or phase change material
C126-025 10.2 / 6,559 0.45 / 12.7 25
(Hi-Flow by Bergquist)
C126-040 16.3 / 10,495 0.72 / 20.3 40
(Optional) Sil-Pad 900-S, K6 800-S
Insulator
C126-050 20.4 / 13,119 0.90 / 25.4 50
and K10 by Bergquist
C126-075 30.6 / 21,655 1.35 / 38.1 75
hEAT DiSSiPATiON
Heat dissipation is the total for ALL DEVICES attached to heatsink.
Air Velocity (ft./min.)
Air Velocity (ft./min.)
200 400 600 800 1000
200 400 600 800 1000
140 9
38
C247-025-1AE (1 device)
TO-126/CE-S102 (25mm long)
12
C247-050-2AE (2 devices) 8
one device w/Sil-pad 900s
36
120
C247-075-3AE (3 devices)
7
34
100
10
6
32
80
5
30 8
4
60
28
3
40
6
26
2
20
1 24
4
0
0
22
0 510 15
2 3 4 5 6 7 8 9 10
Heat Dissipated, total for ALL devices (watts)
Total Heat Dissipated (watts)
(continued)
168 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com
Case Temp. Rise above Ambient (C)
Thermal Resistance from Mounting
Case to Ambient (C/watts)
Average Heat Sink Temp. Rise
above Ambient (C)
Avg. Thermal Resistance from Mounting
Surface to Ambient (C/watts)C Series
TO-126, TO-247, TO-220 and TO-264 Package Heatsinks
DimENSiONS
0.806" 0.785"
with TO-247 with TO-220
or TO-264 (19.94mm)
TO-247
0.77" (20.47mm)
0.71"
(19.6mm)
(18mm)
TO-126 & TO-220
0.73"
with TO-126
(18.6mm)
0.57"
(14.48mm)
1.28" 1.50"
(32.5mm) (38mm)
TO-264
1.12"
(28.5mm)
0.73"
(18.5mm)
0.35"
(8.89mm)
0.10" 0.10"
0.73"
0.100" 0.100"
(2.5mm) (2.5mm)
(18.54mm)
L-0.16" (4.06mm)
(2.5mm) (2.54mm)
(all models)
0.08"
0.385" 0.385"
(2.08mm)
(9.78mm) (9.78mm)
(all models)
Land Pattern
X and Y dimensions at user discretion
0.07" pth typ C C 0.10" pth
L L
(1.8mm) (2.5mm)
Y X
TO-126
0.71" 0.73"
(18.0mm)(18.6mm)
0.18"
(4.6mm)
L 0.16"(4.06mm) 0.08"
(2.0mm)
L
hOw TO ORDER
Standard part numbers
RoHS Compliant
No Finish (degreased) Black Anodized No. of Clips
C247-025-1AE
C247-025-1VE C247-025-1AE 1
Series Clip size Length No. of Finish
(mm) clips A = black anodized C247-050-2VE C247-050-2AE 2
V = degreased
C247-075-3VE C247-075-3AE 3
C264-030-1VE C264-030-1AE 1
C264-058-2VE C264-058-2AE 2
C264-085-3VE C264-085-3AE 3
C220-025-1VE C220-025-1AE 1
C220-050-2VE C220-050-2AE 2
C220-075-3VE C220-075-3AE 3
C126-025-1VE C126-025-1AE 1
C126-040-2VE C126-040-2AE 2
Packaging: Bulk
1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com 169