The unique design (patent pending) of the W Series heat sinks
combines a tin plated, solderable, integral spring clip with an
extruded aluminum heat sink body for an all-in-one solution to
through-hole mounting of TO-220 or TO-247 packages. These
self-aligning heat sinks feature solderable feet and an inte-
grated clip with 13.2 (lbf) of force on the center of the device to
enhance thermal performance.
W Series Heatsinks
Fꢀr to-220 ꢁꢂd to-247 dꢃvꢄcꢃꢅ
0.72" (18.3mm)
0.92" (23.4mm)
0.63"
(16.0mm)
T220
T247
•ꢀMaximumꢀReliability:ꢀhelps pre-
F e a t ꢈ R e s
vent short circuits by eliminating
•ꢀReducedꢀAssemblyꢀCost:ꢀ
metal particles from thread tap-
spring clip and auto-align feature
ping
makes fasteners and fixtures
obsolete, along with stray metal
filings from tapped holes
T220
•ꢀRoHS Compliant
1.20"
(30.5mm)
s p e ꢉ i F i ꢉ a t i o n s
HeatꢀSink:ꢀAluminum alloy 6063-
T5 or equivalent.
•ꢀMaximumꢀRepeatability:ꢀclamp-
ing force of the spring clip is not
degraded by repeated loading
and unloading
T247
1.20-1.26"
(30.5-32.0mm)
SpringꢀClip:ꢀMusic wire, per
ASTM A228
•ꢀMaximumꢀHeatꢀTransferꢀperꢀ
UnitꢀSpace:ꢀmaximum surface
area per unit volume and con-
sistent mounting force reduces
thermal resistance
0.14"
(3.6mm)
Pin:ꢀSolderable 100% tin over
copper strike
T220 0.50" (12.7mm)
T247 0.71" (18.0mm)
Pin diameter
0.06" (1.5mm)
Interfaceꢀthermalꢀresistance:ꢀ
for improvement, use thermal
joint compound or 0.005 Grafoil
(TGon 800 by Laird)
Patent
Pending
•ꢀMaximumꢀResistanceꢀtoꢀShockꢀ
andꢀVibration:ꢀlight weight,
resilient spring clip locks the
Interfaceꢀelectricalꢀisolation:ꢀ
Sil-Pad 900S by Bergquist or
equivalent
component in place and is highly
resistant to shock and vibration
Mounting: Vertical thru-hole
mount
ClipꢀForce: 13.2 lbf.
H e a t D i s s i p a t i o n
T220-101E
T247-101E
DT2-101E
T220-101E and T247-101E
Air Velocity (ft./min.)
200
400
600
800
1000
14
250
200
150
100
50
Fꢀr
ohmꢄꢆꢃ
surfꢁcꢃ
T220-101E
T247-101E
12
10
8
Air Flow
Hꢃꢁꢆꢅꢄꢂk
pꢁrꢆ numbꢃr
pꢁckꢁgꢃ Rꢃꢅꢄꢅꢆꢀr
arꢃꢁ
thꢃrmꢁl
Wꢃꢄghꢆ Rꢃꢅꢄꢅꢆꢁꢂcꢃ*
Side to Side
tyꢇꢃ
sꢃrꢄꢃꢅ
(ꢄꢂ2)
Wa-t220-101e
WV-t220-101e
Wa-t247-101e
WV-t247-101e
Rs-a=12°C/W
TO-220 TBH25, TCH35 6.5 0.35 oz/10g
TO-247 TEH70, TEH100 8.4 0.42 oz/12g
Rs-a=13°C/W
Rs-a=11°C/W
Rs-a=12°C/W
6
Free
Air
Wa-Dt2-101e TO-220 TBH25, TCH35,
WV-Dt2-101e & TO-247 TEH70, TEH100
Rs-a=7°C/W
Rs-a=8°C/W
4
15.1 0.79 oz/22g
Air Flow
along Fins
2
*Natural convection at 10W heat dissipation
0
0
0
2
4
8
12
16
20
ꢊ a n D p a t t e R n
Heat Dissipated (watts)
0.63"
Air Velocity (ft./min.)
(16.0mm)
DT2-101E
100
200
400
600
800
1000
12
0.08"
(2.0mm)
140
120
100
80
DT2-101E
10
8
ø 0.050"
Air Flow
Side to Side
Free
Air
(1.3mm)
0.72"
0.500"
T220
(18.3mm) (12.7mm)
C
L
0.92"
0.711"
T247
6
0.06"
(1.5mm)
(23.4mm) (18.1mm)
60
Air Flow
along Fins
4
40
ø 0.080"
(2.0mm)
2
0.27" 0.18"
(6.9mm) (4.6mm)
20
0
0
0
2
4
8
12
16
20
1.71" (43.4mm)
ø 0.080"
(2.0mm)
Heat Dissipated (watts)
0.500"
(12.7mm)
0.711"
(18.1mm)
S ta n d a r d p a r t n u m b e r S F o r W S e r i e S
0.08"
(2.0mm)
DT2
C
L
pꢁrꢆ numbꢃr
Dꢃꢅcrꢄꢇꢆꢄꢀꢂ
pꢁckꢁgꢄꢂg
0.63"
(16.0mm)
0.18"
(4.6mm)
WA-T220-101E
WV-T220-101E
Heat sink for TO-220, black anodized
Heat sink for TO-220, degreased
Bulk
Bulk
0.28"
(16mm)
WA-T247-101E
WV-T247-101E
Heat sink for TO-247, black anodized
Heat sink for TO-247, degreased
Bulk
Bulk
0.89" (22.6mm)
ø 0.050" typ.
(1.3mm)
WA-DT2-101E
WV-DT2-101E
Heat sink for TO-247 &TO-220, black anodized Bulk
Heat sink for TO-247 &TO-220 , degreased Bulk
0.59"
(15mm)
0.79"
(20.1mm)
72
Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
