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M Series Heatsinks
Heatsink with clips for TO-264 and TO-247
Thermal
Surface Area Weight Resistance
Part No. (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
FEATURES
•Minimumassemblycostandlabor.SpringClips
makethemountingholesandfastenersobsoletein
assemblyoperations&reducecosts.
•MaximumThermalTransfer.Maximumsurfacearea
perunitvolume,efficientcoolingfins&consistent
mountingforcereducesthermalresistance
•MaximumRepeatability.Constantspringforceover
repeatedassembly/disassembly
•MaximumReliability.Resilientspringactionlocks
electroniccomponentinplace.Fewerpartsin
assemblyandnofastenersandwashersrequired.
Preventshortcircuitbyeliminatingmetalparticles
generatedfromhardwareorthreadtapping
•DesignFlexibility.Maximumflexibilityfordynamic
devicelocationsandpowerupgrading.“Configure-
to-Fit”&“Scale-to-Meet”optionsgivedesignersthe
totalfreedomtoconfiguretheheatsinktofittheir
packagingdesignsandtoscaletheheatsinkto
meettheirpowerdissipations.
CHARACTERISTICS
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
SERIES SPECIFICATIONS
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densityandsmall
size(1Uor2U)electronicpackagingwithforcedcon-
vectioncooling.
(continued)
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178
HEAT DISSIPATION
Fortwodevices
DIMENSIONS
Standard Part Numbers
Part Number Description Packaging
MV-102-55E 55mm No finish (degreased) Bulk
MA-102-55E 55mm Black anodized Bulk
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
Case Temp. Rise above Ambient (°C)
Heat Dissipated, total for two devices (watts)
60
20
0
100
40
10 20 5030 400
140
80
120
Thermal Resistance from Case
to Ambient (°C/watts)
1
0
2
4
8004000 600 12001000
Air Velocity (ft./min.)
3
5
7
6
200
MA-101-27
MA-301-27
MA-102-55
MA-302-55
W
Z
V
Y
2.01" (51mm)
2.17" (55mm)
0.08"
(2.0mm)
X
C
LC
L
user defined values
ø 0.07"
(1.8mm) 4x
ø 0.10"
(2.5mm)
W
Z
V
0.90"
(22.9mm)
1.06" (27mm)
0.08"
(2.0mm)
X
C
L
user
defined
value
ø 0.07"
(1.8mm) 4x
ø 0.10"
(2.5mm
)
-55E -27E
-102-55E
0.84"
(21.3mm)
1.04" ±.025
(26.4mm)
1.71"
(43.5mm)
0.16"
(4.2mm)
2.20" (55.8mm)
-302-55E
-101-27E -301-27E
1.52"
(38.6mm)
1.34" (34.1mm)
0.83"
(21.1mm)
0.95" ±.025
(24.1mm)
0.14"
(3.6mm)
MV-102-55E
Series
No. of clips
Length
(mm)
Finish
A = black anodized
V = degreased
RoHS Compliant
Part Number W V Z*
MV-102-55E 1.35" / 34.3 0.95" / 24.1 0.18" / 4.6
MA-102-55E
MA-101-27E
MA-101-27E
MV-302-55E 2.20" / 55.9 1.04" / 26.4 0.21" / 5.3
MA-302-55E
MA-301-27E
MA-301-27E
*Device package
dimensions can
vary. Customer
should verify
this dimension.
M Series Heatsinks
Heatsink with clips for TO-264 and TO-247
HOW TO ORDER