D Series
Heatsink For TO-252, TO-263
and TO-268 devices
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.
Air Velocity (ft./min.)
60
55
Case Temp. Rise above
Ambient ( C)
50
45
40
8
35
200
400
600
800
1000
14
50
Thermal Resistance from Mounting
Surface to Ambient ( C/watts)
200
F e at u r e S
• 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 & reel (250
units per reel
• RoHS Compliant
Air Velocity (ft./min.)
400
600
800
1000
12
Thermal Resistance from Mounting
Surface to Ambient ( C/watts)
H e at D i S S i pat i o n
12
Case Temp. Rise above
Ambient ( C)
TO-252 (D)
TO-263 (D2)
101 & 201
45
TO-268 (D3)
101 & 201
10
10
40
8
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.
35
6
301
30
25
2
4
6
8
Heat Dissipated (watts)
10
6
30
301
4
4
25
2
4
6
8
Heat Dissipated (watts)
10
2
DimenSionS
±0.012” / ±0.30mm
Style 10
TO-252 (D)
TO-263 (D2) TO-268 (D3)
1.02"
1.22"
25.91mm
30.9mm
Style 20
1.02"
25.9mm
0.50"
0.50"
12.7mm
12.7mm
Style 30
TO-268 (D3) TO-263 (D2)
1.58"
1.39"
40.2mm
35.2mm
0.50"
12.7mm
0.40"
10.16mm
0.10"
2.54mm
0.27"
6.86mm
0.44"
(11.2mm)
0.56"
(14.2mm)
0.64"
(16.2mm)
0.76"
(19.2mm)
0.48"REF
12.1mm
0.26"
6.6mm
0.44"
11.1mm
0.56"
14.1mm
0.46"
11.6mm
0.09"
2.3mm
0.15"
3.7mm
0.26"
6.6mm
TO-268 (D3)
0.64"
16.2mm ±0.2
0.76"
19.2mm ±0.2
TO-263 (D2)
0.44"
11.2mm
0.56"
14.2mm
TO-252 (D)
TO-263 (D2)
TO-268 (D3)
±0.2mm
(continued)
170
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
D Series
Land Patterns for D, D2 and D3
TO-252 (D)
TO-263 (D2)
0.64"
(16.3mm)
Heatsink For TO-252, TO-263
and TO-268 devices
L a n D pat t e r n S
0.62"
(15.8mm)
0.35"
(8.89mm)
0.44"
(11.2mm)
TO-252 (D)
TO-263 (D2)
TO-268 (D3)
0.83"
(21.1mm)
0.81"
(20.6mm)
0.63"
(16.0mm)
0.56"
(14.2mm)
0.54"
(13.7mm)
0.56"
(14.2mm)
0.54"
(13.7mm)
0.06"
(1.40mm)
0.076"
TO-252 (D)
(1.94mm)
0.03"
(0.80mm)
TO-263 (D2)
0.06"
(1.40mm)
0.03"
(0.80mm)
ta p e a n D r e e L
o r D e r i n g i n F o r m at i o n
Style
10, 20 or 30
RoHS
Compliant
Reel diameter: 13.00” (330.00mm)
200 pcs. per
K
0
P
1
P
0
DA-T263-201E-TR
S
0
W
Series Finish
D
A = black anodized
V = degreased
Package
T263 = TO-263
(or TO-252)
T268 = TO-268
Tape & Reel
Length
1 = 0.50"
2, 3, 4 = optional lengths
assigned
sequentially on
customer request
Standard part numbers For D Series
ø D
0
Style 10
D
0
K
0
P
0
P
1
S
0
W
1.55mm
10.5mm
4mm
24mm
40.4mm
44mm
Style 20
1.5mm
12.20mm
4.0mm
24mm
40.4mm
44mm
Style 30
1.5mm
11.50mm
4.0mm
24.0mm
52.4mm
56mm
Part Number
DV-T263-101E
DA-T263-101E
DV-T263-101E-TR
DA-T263-101E-TR
DV-T268-101E
DA-T268-101E
DV-T268-101E-TR
DA-T268-101E-TR
DV-T263-201E
DA-T263-201E
DV-T263-201E-TR
DA-T263-201E-TR
DV-T268-301E
DA-T268-301E
DV-T268-301E-TR
DA-T268-301E-TR
DV-T263-301E
DA-T263-301E
DV-T263-301E-TR
DA-T263-301E-TR
Description
for
for
for
for
for
for
for
for
for
for
for
for
for
for
for
for
for
for
for
for
D2
D2
D2
D2
D3
D3
D3
D3
D
D
D
D
pack,
pack,
pack,
pack,
pack,
pack,
pack,
pack,
D2
D2
D2
D2
degreased
black anodized
degreased
black anodized
degreased
black anodized
degreased
black anodized
degreased
black anodized
degreased
black anodized
Packaging
Bulk
Bulk
Reel
Reel
Bulk
Bulk
Reel
Reel
Bulk
Bulk
Reel
Reel
Bulk
Bulk
Reel
Reel
Bulk
Bulk
Reel
Reel
Weight
3.8
3.8
3.8
3.8
4.1
4.1
4.1
4.1
g
g
g
g
g
g
g
g
Removable Kapton
tape on each part
facilitates handling
by automatic pick
and place equipment.
Style 10 tape and
reel only.
or
or
or
or
pack,
pack,
pack,
pack,
D3
D3
D3
D3
D2
D2
D2
D2
pack,
pack,
pack,
pack,
pack,
pack,
pack,
pack,
degreased
black anodized
degreased
black anodized
degreased
black anodized
degreased
black anodized
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
171
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