M Series Heatsinks
Heatsink with clips for TO-264 and TO-247
FeatureS
Minimum assembly cost and labor. Spring Clips
make the mounting holes and fasteners obsolete in
assembly operations & reduce 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
electronic component in place. Fewer parts in
assembly and no fasteners and washers required.
Ohmite introduces the M series, patented (Pat. No.
Prevent short circuit by eliminating metal particles
7,151,669), high per formance, low cost, configu-
generated from hardware or thread tapping
rable, scalable and compact heat sink with matrix clip
Design Flexibility. Maximum flexibility for dynamic
system for TO-247 and TO-264 packages. This pow-
device locations and power up grading. Configure-
er ful heat sink provides the easiest assembly, largest
to-Fit & Scale-to-Meet options give designers the
sur face area and smallest footprint. It is the ideal
total freedom to configure the heat sink to fit their
type of heat sink for high power density and small
packaging designs and to scale the heat sink to
size (1U or 2U) electronic packaging with forced con-
meet their power dissipations.
vection cooling.
SerieS SpeCiFiCationS
Thermal
Surface Area Weight Resistance
2 2
Part No. (in /mm ) (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-theta for 18W dissipation total for two devices in natural convection
c-a
CHaraCteriStiCS
Heat Sink Aluminum Alloy 6063-T5 or Equivalent with either degreased or black anodized
finish.
Music Wire, Per ASTM A228 with bright nickel plating
Spring Clip
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)
Sil-Pad 900S by Bergquist or equivalent
Interface electrical isolation
(continued)
1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com 177M Series Heatsinks
Heatsink with clips for TO-264 and TO-247
Heat DiSSipation
Air Velocity (ft./min.)
For two devices
0 200 400 600 800 1000 1200
140
7
120
6
100
5
MA-101-27
80 4
MA-301-27
MA-102-55
60 3
MA-302-55
40 2
20 1
0 0
0 10 20 30 40 50
Heat Dissipated, total for two devices (watts)
DiMenSionS
user
user defined values
0.07" 0.07"
defined
C C C
L L L value
(1.8mm) (1.8mm)
2.20" (55.8mm)
4x 4x
Y X X
0.10" 0.10"
(2.5mm) (2.5mm)
1.34" (34.1mm)
1.52" V V
1.71"
(38.6mm) (43.5mm) -55E -27E
W W
Z Z
-102-55E -302-55E
-101-27E -301-27E
0.84"
0.90"
0.83" 0.16"
(21.3mm) 2.01" (51mm)
0.14" 0.08" 0.08" (22.9mm)
(21.1mm) (4.2mm)
(3.6mm) (2.0mm) (2.0mm)
2.17" (55mm) 1.06" (27mm)
1.04" .025
0.95" .025
(26.4mm)
(24.1mm)
Part Number W V Z*
MV-102-55E
1.35" / 34.3 0.95" / 24.1 0.18" / 4.6
MA-102-55E *Device package
MA-101-27E
dimensions can
MA-101-27E
vary. Customer
should verify
MV-302-55E
2.20" / 55.9 1.04" / 26.4 0.21" / 5.3
this dimension.
MA-302-55E
MA-301-27E
MA-301-27E
How to orDer
Standard Part Numbers
No. of clips RoHS Compliant
Part Number Description Packaging
MV-102-55E
MV-102-55E 55mm No finish (degreased) Bulk
Series Finish Length MA-102-55E 55mm Black anodized Bulk
A = black anodized (mm)
V = degreased MV-101-27E 27mm No finish (degreased) Bulk
MA-101-27E 27mm Black anodized Bulk
MV-302-55E 55mm No finish (degreased) Bulk
MA-302-55E 55mm Black anodized Bulk
MV-301-27E 27mm No finish (degreased) Bulk
MA-301-27E 27mm Black anodized Bulk
178 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 Case
to Ambient (C/watts)