W Series Heatsinks
For to-220 and to-247 devices
T220
0.72"
(18.3mm)
T247
0.92"
(23.4mm)
0.63"
(16.0mm)
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.
FeatuRes
• Reduced Assembly Cost:
spring clip and auto-align feature
makes fasteners and fixtures
obsolete, along with stray metal
filings from tapped holes
• Maximum Repeatability: clamp-
ing force of the spring clip is not
degraded by repeated loading
and unloading
• Maximum Heat Transfer per
Unit Space: maximum
surface
area per unit volume and con-
sistent mounting force reduces
thermal resistance
• Maximum Resistance to Shock
and Vibration: light
weight,
resilient spring clip locks the
component in place and is highly
resistant to shock and vibration
• Maximum Reliability: helps
pre-
vent short circuits by eliminating
metal particles from thread tap-
ping
• RoHS Compliant
T220
1.20"
(30.5mm)
T247
1.20-1.26"
(30.5-32.0mm)
0.14"
(3.6mm)
T220
0.50"
(12.7mm)
T247
0.71"
(18.0mm)
Pin diameter
0.06"
(1.5mm)
speciFications
Heat Sink: Aluminum
alloy 6063-
T5 or equivalent.
Spring Clip: Music
wire, per
ASTM A228
Pin: Solderable
100% tin over
copper strike
Interface thermal resistance:
for improvement, use thermal
joint compound or 0.005 Grafoil
(TGon 800 by Laird)
Interface electrical isolation:
Sil-Pad 900S by Bergquist or
equivalent
Mounting:
Vertical thru-hole
mount
Clip Force:
13.2 lbf.
Patent
Pending
Heat Dissipation
T220-101E
T247-101E
For
ohmite
package Resistor
type
series
DT2-101E
surface
area
(in
2
)
Weight
T220-101E and T247-101E
250
200
Air Velocity (ft./min.)
400
600
800
T220-101E
T247-101E
1000
14
12
10
150
8
6
Free
Air
50
4
Air Flow
along Fins
2
0
0
2
4
12
8
Heat Dissipated (watts)
Air Velocity (ft./min.)
100
200
400
600
800
1000
12
10
8
6
Air Flow
along Fins
4
2
0
0
2
4
8
12
Heat Dissipated (watts)
16
20
Thermal Resistance from Mounting
Surface to Ambient (°C/watts)
16
20
Thermal Resistance from Mounting
Surface to Ambient (°C/watts)
Mounting Surface Temp. Rise
above Ambient (°C)
Heatsink
part number
Wa-t220-101e
WV-t220-101e
Wa-t247-101e
WV-t247-101e
Wa-Dt2-101e
WV-Dt2-101e
thermal
Resistance*
R
TO-220 TBH25, TCH35 6.5 0.35 oz/10g
s-a
=12°C/W
R
s-a
=13°C/W
TO-247 TEH70, TEH100 8.4 0.42 oz/12g R
s-a
=11°C/W
R
s-a
=12°C/W
TO-220 TBH25, TCH35, 15.1 0.79 oz/22g R
s-a
=7°C/W
&
TO-247 TEH70, TEH100
R
s-a
=8°C/W
*Natural convection at 10W heat dissipation
200
Air Flow
Side to Side
100
lanD patteRn
0.63"
(16.0mm)
0.08"
(2.0mm)
ø 0.050"
(1.3mm)
C
L
0
DT2-101E
140
Mounting Surface Temp. Rise
above Ambient (°C)
DT2-101E
120
100
80
60
40
20
0
Air Flow
Side to Side
Free
Air
0.72"
0.500"
(18.3mm) (12.7mm)
0.711"
T247
0.92"
(23.4mm) (18.1mm)
T220
0.06"
(1.5mm)
ø 0.080"
(2.0mm)
0.27" 0.18"
(6.9mm) (4.6mm)
0.711"
(18.1mm)
0.08"
(2.0mm)
0.28"
(16mm)
0.63"
(16.0mm)
ø 0.080"
(2.0mm)
DT2
0.18"
(4.6mm)
1.71"
(43.4mm)
0.500"
(12.7mm)
C
L
S ta n d a r d pa rt n u m b e r S F o r W S e r i e S
part number
WA-T220-101E
WV-T220-101E
WA-T247-101E
WV-T247-101E
WA-DT2-101E
WV-DT2-101E
Description
Heat sink for TO-220, black anodized
Heat sink for TO-220, degreased
Heat sink for TO-247, black anodized
Heat sink for TO-247, degreased
Heat sink for TO-247 &TO-220, black anodized
Heat sink for TO-247 &TO-220 , degreased
packaging
Bulk
Bulk
Bulk
Bulk
Bulk
Bulk
ø 0.050" typ.
(1.3mm)
0.89"
(22.6mm)
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
OHMITE [ OHMITE MFG. CO. ]
