M-SERIES Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Heatsink with clips for TO-264 and TO-247

M Series Heatsinks
Heatsink with clips for TO-264 and TO-247
Ohmite introduces the M series,  patented (Pat. No.
7,151,669), high performance, low cost, configu-
rable, scalable and compact heat sink with matrix clip
system for TO-247 and TO-264 packages. This pow-
erful heat sink provides the easiest assembly, largest
surface area and smallest footprint. It is the ideal
type of heat sink for high power density and small
size (1U or 2U) electronic packaging with forced con-
vection cooling.
F e at u r e s
• Minimum assembly cost and labor. Spring Clips
make the mounting holes and fasteners 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 up grading. “Configure-
to-Fit” & “Scale-to-Meet” options give designers the
total freedom to configure the heat sink to fit their
packaging designs and to scale the heat sinkto
meet their power dissipations.
series specifications
Thermal

Part No.
Surface Area Weight Resistance
(in²/mm²)
(oz./g) (°c/w)*
MV-102-55E 45 / 29,097 2.2 / 63 6.0
MA-102-55E 45 / 29,097 2.2 / 63 5.2
MV-101-27E 22 / 14,284 1.1 / 31 9.6
MA-101-27E 22 / 14,284 1.1 / 31 8.0
MV-302-55E 76 / 49,218 4.7 / 134 3.6
MA-302-55E 76 / 49,218 4.7 / 134 3.0
MV-301-27E 37.3 / 24,161 2.3 / 66 5.5
MA-301-27E 37.3 / 24,161 2.3 / 66 4.6
* R-thetac-a for 18W dissipation total for two devices in natural convection
C h a r a c t e r i s t i cs
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 com-
pliant.
Interface thermal resistance Thermal joint compound or 0.005 Grafoil (TGon 800 by Laird)
Interface electrical isolation Sil-Pad 900S by Bergquist or equivalent
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]
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