HEATSINK
D Series
Heatsink For TO-252, TO-263
and TO-268 devices
OhmiteꢀDꢀSeriesꢀheatsinksꢀprovideꢀanꢀinnovativeꢀ
solutionꢀforꢀSMTꢀcompatibleꢀsemiconductorsꢀandꢀ
resistors.ꢀTheꢀuniqueꢀdesignꢀ(PatentꢀPending)ꢀcom-
binesꢀtinꢀplated,ꢀsolderableꢀrodsꢀwithꢀanꢀaluminumꢀ
extrudedꢀheatꢀsinkꢀbody.ꢀTheseꢀrodsꢀ(orꢀ“rollers”)ꢀ
areꢀmatedꢀmechanicallyꢀtoꢀtheꢀheatsinkꢀbyꢀforgingꢀtoꢀ
reduceꢀtheꢀthermalꢀresistanceꢀbetweenꢀtheꢀheatsinkꢀ
bodyꢀandꢀtheꢀsolderableꢀfeet.
ꢀꢀSpecificallyꢀdesignedꢀforꢀuseꢀwithꢀtheꢀincreasinglyꢀ
popularꢀTO-252,ꢀTO-263ꢀandꢀTO-268ꢀpackages,ꢀtheꢀ
DꢀSeriesꢀaffordsꢀtheꢀuserꢀsuperiorꢀthermalꢀperfor-
manceꢀoverꢀtheꢀmoreꢀcommonꢀstampedꢀaluminumꢀ
heatsinks.ꢀByꢀeliminatingꢀtheꢀstakingꢀjointꢀtypicallyꢀ
usedꢀinꢀstampedꢀheatsinks,ꢀtheꢀresultingꢀairꢀgapꢀandꢀ
thermalꢀ“bottle-neck”ꢀisꢀalsoꢀeliminated,ꢀwhileꢀsur-
faceꢀareaꢀforꢀcoolingꢀisꢀmaximizedꢀwithꢀtheꢀextrudedꢀ
finsꢀofꢀtheꢀDꢀSeriesꢀbody.
F ꢀ at u ꢂ ꢀ S
•ꢀIncreasedꢀsurfaceꢀareasꢀbyꢀ3ꢀtimesꢀthereforeꢀꢀther-
malꢀperformanceꢀupꢀtoꢀ300%ꢀoverꢀtheꢀaluminumꢀ
stampedꢀheatꢀsinksꢀonꢀmarkets
•ꢀLightꢀweightꢀaluminumꢀconstructionꢀallowsꢀfasterꢀ
pickꢀandꢀplaceꢀassemblyꢀreducingꢀtheꢀmanufactur-
ingꢀcycleꢀtime
•ꢀRadiusꢀmountedꢀ“Rollers”ꢀareꢀdesignedꢀforꢀmaxi-
mizingꢀheatꢀtransferꢀfromꢀtheꢀcomponentꢀandꢀ
avoidingꢀtheꢀthermalꢀ“bottle-neck”ꢀseenꢀinꢀstampedꢀ
andꢀstakedꢀheatsinks.
•ꢀAvailableꢀinꢀbulkꢀpackagingꢀorꢀtapeꢀ&ꢀreelꢀ(250ꢀ
unitsꢀperꢀreel
•ꢀRoHSꢀCompliant
Hꢀat DꢁSSꢁpatꢁon
Air Velocity (ft./min.)
400 600 800
Air Velocity (ft./min.)
Finalꢀthermalꢀperformanceꢀ
200
1000
14
200
400
600
800
1000
12
isꢀhighlyꢀdependentꢀonꢀtheꢀ
thermalꢀcharacteristicsꢀofꢀ
theꢀPCB.ꢀItꢀisꢀpossibleꢀtoꢀseeꢀ
aꢀ50%ꢀdropꢀinꢀtempꢀriseꢀinꢀ
naturalꢀconvectionꢀwithꢀaꢀ
thermallyꢀimprovedꢀPCB.
60
55
50
45
40
35
30
25
50
45
40
35
30
25
TO-252 (D)
TO-263 (D2)
TO-268 (D3)
10
8
12
10
8
101 & 201
101 & 201
6
301
4
6
301
4
2
2
4
6
8
10
2
4
6
8
10
Heat Dissipated (watts)
Heat Dissipated (watts)
DꢁmꢀnSꢁonS
TO-252 (D)
TO-263 (D2)
1.02"
25.91mm
Style 10
Style 20
Style 30
TO-268 (D3)
1.02"
25.9mm
1.58"
40.2mm
1.22"
31.0mm
0.50"
12.7mm
0.50"
12.7mm
0.50"
12.7mm
0.40"
0.48"REF
12.1mm
0.46"
11.6mm
0.27"
10.16mm
0.26"
0.26"
6.86mm
6.6mm
6.6mm
0.09"
2.3mm
0.15"
3.7mm
0.10"
2.54mm
0.44" (11.2mm)
0.56" (14.2mm)
0.44"
11.1mm
0.56"
14.1mm
0.64"
16.2mm
TO-252 (D)
TO-263 (D2)
0.76"
19.2mm
0.63" (16.1mm)
0.75" (19.1mm)
TO-268 (D3)
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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