W Series Heatsinks
For TO-220, TO-247, and TO-264 devices
F ꢀ ꢁꢂ u ꢃ ꢀ S
•ꢀReducedꢀAssemblyꢀCost:ꢀspringꢀclipꢀandꢀauto-alignꢀ
feature makes fasteners and fixtures obsolete,
along with stray metal filings from tapped holes
•ꢀMaximumꢀRepeatability:ꢀclampingꢀforceꢀofꢀtheꢀ
spring clip is not degraded by repeated loading and
unloading
•ꢀMaximumꢀHeatꢀTransferꢀperꢀUnitꢀSpace:ꢀmaximumꢀ
surface area per unit volume and consistent mount-
ing force reduces thermal resistance
•ꢀMaximumꢀResistanceꢀtoꢀShockꢀandꢀVibration:ꢀlightꢀ
weight, resilient spring clip locks the component in
place and is highly resistant to shock and vibration
T247-101E
T264-101E
T220-101E
DT2-101E
The unique design (patent pending) of the W Series
heat sinks combines a tin plated, solderable, inte-
gral spring clip with an extruded aluminum heat
sink body for an all-in-one solution to through-hole
mounting of TO-220, TO-247, and TO-264 packages.
These self-aligning heat sinks feature solderable feet
and an integrated clip with 13.2 (lbf) of force on
the center of the device to enhance thermal perfor-
mance.
•ꢀMaximumꢀReliability:ꢀhelpsꢀpreventꢀshortꢀcircuitsꢀ
by eliminating metal particles from thread tapping
•ꢀRoHSꢀCompliant
SꢀꢃꢄꢀS SPꢀcꢄFꢄcꢁꢂꢄONS
Heatsink
Part Number
For Package
Type
Ohmite Resistor Surface Area
Thermal
Resistance*
Series
(in2)
Weight
WA-T220-101E
WV-T220-101E
WA-T247-101E
WV-T247-101E
WA-T264-101E
WV-T264-101E
Rs-a=12°C/W
Rs-a=13°C/W
Rs-a=11°C/W
Rs-a=12°C/W
Rs-a=11°C/W
Rs-a=12°C/W
Rs-a=7°C/W
Rs-a=8°C/W
TO-220
TBH25, TCH35
6.5
0.35 oz/10g
TO-247
TEH70, TEH100
TFH85
8.4
8.4
0.42 oz/12g
0.42 oz/12g
0.79 oz/22g
TO-264
WA-DT2-101E TO-220
WV-DT2-101E & TO-247
TBH25, TCH35,
TEH70, TEH100
15.1
*Natural convection at 10W heat dissipation
cHꢁꢃꢁcꢂꢀꢃꢄSꢂꢄcS
Aluminum alloy 6063-T5 or equivalent.
Heat Sink
Spring Clip
Pin
Music wire, per ASTM A228
Solderable 100% tin over copper strike
for improvement, use thermal joint com-
pound or 0.005 Grafoil (TGon 800 by
Laird)
Interface thermal
resistance
Sil-Pad 900S by Bergquist or equivalent
Interface electrical
isolation
Vertical thru-hole mount
13.2 lbf.
Mounting
Clip Force
Patent
Pending
(continued)
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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