Datasheet

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170
D Series
Heatsink For TO-252, TO-263
and TO-268 devices
HEAT DISSIPATION
FEATURES
•Increasedsurfaceareasby3timesthereforether-
malperformanceupto300%overthealuminum
stampedheatsinksonmarkets
•Lightweightaluminumconstructionallowsfaster
pickandplaceassemblyreducingthemanufactur-
ingcycletime
•Radiusmounted“Rollers”aredesignedformaxi-
mizingheattransferfromthecomponentand
avoidingthethermal“bottle-neck”seeninstamped
andstakedheatsinks.
•Availableinbulkpackagingortapeandreel(200or
250basedonpartseries)
•RoHSCompliant
OhmiteDSeriesheatsinksprovideaninnovative
solutionforSMTcompatiblesemiconductorsand
resistors.Theuniquedesign(PatentPending)com-
binestinplated,solderablerodswithanaluminum
extrudedheatsinkbody.Theserods(or“rollers”)
arematedmechanicallytotheheatsinkbyforgingto
reducethethermalresistancebetweentheheatsink
bodyandthesolderablefeet.
Specificallydesignedforusewiththeincreasingly
popularTO-252,TO-263andTO-268packages,the
DSeriesaffordstheusersuperiorthermalperfor-
manceoverthemorecommonstampedaluminum
heatsinks.Byeliminatingthestakingjointtypically
usedinstampedheatsinks,theresultingairgapand
thermal“bottle-neck”isalsoeliminated,whilesur-
faceareaforcoolingismaximizedwiththeextruded
finsoftheDSeriesbody.
FinalthermalperformanceishighlydependentonthethermalcharacteristicsofthePCB.Itis
possibletoseea50%dropintempriseinnaturalconvectionwithathermallyimprovedPCB.
(continued)
800400 600
50
Heat Dissipated (watts)
40
30
25
84
45
35
2610
60
14
6
4
8
10
12
200 1000
Air Velocity (ft./min.)
55
Case Temp. Rise above
Ambient (°C)
Thermal Resistance from Mounting
Surface to Ambient (°C/watts)
TO-252 (D)
TO-263 (D2)
101 & 201
301
401
Case Temp. Rise above
Ambient (°C)
Heat Dissipated (watts)
40
30
25
84
45
35
2610
50
Thermal Resistance from Mounting
Surface to Ambient (°C/watts)
6
2
4
8
10
12
800400200 600 1000
Air Velocity (ft./min.)
TO-268 (D3)
101 & 201
301
401