C40 Heat Sink System
For TO-247, TO-264 and SOT-227 Packages
Single
Mounting
The C40 Series Heat Sink System (Patent Pending)
offers flexible, high performance and compact heat
sinks with an exchangeable cam clip system for TO-
247, TO-264 and SOT-227 (clip in development)
devices. This powerful heat sink can be thru-hole
soldered in single or paired configurations. The paired
unit has mounting holes to accomodate a 40mm x
40mm fan. It is the ideal type of heat sink for high
power density and small size (1U or 2U) electronic
packaging with forced convection.
Paired Heat
Sink Mounting
With a FAN
SerieS SPeCiFiCatiONS
Heatsink Surface Area Weight Length L
2 2
consult factory for
Part Number (in / mm ) (oz / g) (mm)
alternate lengths and
clip combinations
C40-058-VE
63.8 / 41,180 2.5/ 71 58
C40-058-AE
CHaraCteriStiCS
Aluminum Alloy 6063-T5 or Equivalent with either degreased or black
Heat Sink Heat Dissipation
anodized finish.
3
Spring Clip Music Wire, Per ASTM A228 with bright nickel plating
2.5
Solder Foot Cold-rolled Steel, Per ASTM A-366 with pure tin over copper strike.
4 devices
RoHS compliant.
2
Fan 40mm fan with 4 self-tapping M3 screws
1.5
For improvement, use thermal joint compound, 0.005 Grafoil (TGon
Interface Thermal
2 devices
800 by Laird), or phase change material (Hi-Flow by Bergquist)
Resistance
1
Insulator (Optional) Sil-Pad 900-S, K6 800-S and K10 by Bergquist
0.5
0
0 10 20 30
Fan Flow Rate (cfm)
(continued)
1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com 169
Thermal Resistance from Case to
Ambient per Device (C/watts)C40 Heat Sink System
For TO-247, TO-264 and SOT-227 Packages
dimeNSiONS
Single Mounting Back-to-back Configuration
(This configuration can accept a 40x40mm fan)
1.26"
(32mm) 1.26"
L 0.47"
(32.0mm)
(12mm)
1.82"
1.82"
1.72" (46.3mm)
(46.3mm)
(43.8mm)
1.18"
1.18"
(29.9mm)
(29.9mm)
2x 0.08"
L 0.16" 1.37"
0.10" 0.79"
2x 0.10"
(2.0mm)
(0.16mm) (34.7mm)
(2.5mm) (20mm)
(2.5mm)
0.10"
(2.6mm)
2.52"
Clip Dimensions
(64.0mm)
0.43" W +0.12"
6x
(11mm) (+3.0mm)
0.07" pth 0.58"
W
(1.8mm) (14.6mm)
0.78"
(19.8mm)
1.39" REF
(35.3mm)
L L
LAND LAND
L 0.16" L 0.16"
PATTERN PATTERN
Y
Y
(0.16mm) (0.16mm)
X X
T247 0.63" (16.1mm)
T264 0.80" (20.2mm)
2x 0.08" 2x 0.18" 2x 0.08" 2x 0.18" 4x 0.11" pth
(2.0mm) 0.11" pth (4.06mm) (2.0mm) (4.06mm) (2.8mm)
(2.8mm)
NOTE: Due to possible screw torquing on long extrusions, Customer
should check for coplanarity prior to final assembly or soldering.
HOw tO Order
Heatsink Clip
C40-058-AE CLA-T247-21E
RoHS compliant
Length Finish Device type Standard RoHS
Series Clip series
(mm) T247 = TO-247 compliant
A = black anodized configuration
T264 = TO-264
V = degreased
S227 = SOT-227
(in development)
170 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com