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) combines 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 performance 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 surface area for cooling is maximized with the extruded
fins of the D Series body.
F e at u r e s
• Increased surface areas by 3 times therefore thermal performance up to 300% over the aluminum
stamped heat sinks on markets
• Light weight aluminum construction allows faster
pick and place assembly reducing the manufacturing cycle time
• Radius mounted “Rollers” are designed for maximizing heat transfer from the component and
avoiding the thermal “bottle-neck” seen in stamped
and staked heatsinks.
• Available in tape and reel (200 or 250 based on part
series)
• RoHS Compliant
H e a t d i ss i p a t i o n
Air Velocity (ft./min.)
800
1000
50
14
50
12
45
10
101 & 201
301
401
40
35
8
6
30
25
2
4
6
8
Heat Dissipated (watts)
10
4
Case Temp. Rise above
Ambient (°C)
600
TO-252 (D)
TO-263 (D2)
55
Case Temp. Rise above
Ambient (°C)
400
Thermal Resistance from Mounting
Surface to Ambient (°C/watts)
200
200
400
600
800
1000
12
TO-268 (D3)
45
10
101 & 201
301
401
40
8
35
6
30
4
25
2
4
6
8
Heat Dissipated (watts)
10
Thermal Resistance from Mounting
Surface to Ambient (°C/watts)
Air Velocity (ft./min.)
60
2
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)
170
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
D Series
Heatsink For TO-252, TO-263
and TO-268 devices
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"
12.7mm
0.50"
12.7mm
0.40"
10.2mm ±.30
0.48"REF
12.1mm
0.27"
6.9mm
0.10"
2.58mm
Style 30
0.44" (11.2mm)
0.56" (14.2mm)
TO-252 (D)
TO-263 (D2)
0.67" (17mm)
0.79" (20mm)
TO-268 (D3)
±0.25mm
0.50"
12.7mm
0.46"
11.6mm
0.09"
2.3mm
TO-268 (D3) TO-263 (D2)
1.22"
1.03"
31.1mm
26.0mm
0.50"
12.7mm
0.46"
11.7mm
0.26"
6.6mm
0.15"
3.7mm
0.44"
11.1mm
0.56"
14.1mm
Style 40
TO-268 (D3) TO-263 (D2)
1.58"
1.39"
40.2mm
35.2mm
0.26"
6.6mm
TO-268 (D3)
0.67"
17mm ±0.2
TO-263 (D2)
0.44"
11.2mm
0.79"
20mm ±0.2
0.56"
14.2mm
0.09"
2.4mm
0.26"
6.6mm
TO-268 (D3)
0.67"
17.0mm
0.79"
20.0mm
TO-263 (D2)
0.44"
11.2mm
0.56"
14.2mm
(continued)
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
171
D Series
Heatsink For TO-252, TO-263
and TO-268 devices
L a n d Pat t e r n s
Land Patterns for D, D2 and D3
TO-252 (D)
TO-263 (D2)
TO-268 (D3)
0.62" (15.8mm)
0.64" (16.3mm)
0.35" (8.9mm)
0.44" (11.2mm)
0.56"
(14.2mm)
TO-263 (D2)
0.56"
(14.2mm)
0.54"
(13.7mm)
0.06"
(1.4mm)
0.84" (21.4mm)
0.67" (17.0mm)
0.84" (21.4mm)
TO-252 (D)
0.54"
(13.7mm)
0.06"
(1.4mm)
0.076"
(1.9mm) TO-252 (D)
0.03"
(0.8mm) TO-263 (D2)
0.03"
(0.8mm)
Ta p e a n d R e e l
Reel diameter: 13.00” (330.00mm)
200 pcs per reel- 20, 30 and 40 series
250 pcs per reel- 10 series
K0
P1
P0
Style 20
Style 30
Style 40
D0 1.55mm 1.5mm
Style 10
1.5mm
1.55mm
K0 10.5mm 12.20mm 11.50mm 10.5mm
S0 W
ø D0
P0 4mm
4.0mm
4.0mm
4mm
P1 24mm
24mm
24.0mm
24mm
S0 40.4mm 40.4mm
52.4mm
40.4mm
W 44mm
56mm
44mm
44mm
Removable Kapton
tape on each part
facilitates handling
by automatic pick
and place equipment.
Style 10 tape and
reel only.
o r d e r i n g i n f o r m at i o n
Style
10, 20, 30 or 40
RoHS
Compliant
DA-T263-201E-TR
Series Finish
Package
Tape & Reel
Length
D
A = black anodized T263 = TO-263 1 = 0.50"
V = degreased
(or TO-252) 2, 3, 4 = optional lengths
T268 = TO-268
assigned
sequentially on
customer request
Standard part numbers For D Series
Part Number
Description
Packaging
Weight
DV-T263-101E-TR
DA-T263-101E-TR
for D2 PAK, degreased
for D2 PAK, black anodized
Reel
Reel
3.8 g
3.8 g
DV-T268-101E-TR
DA-T268-101E-TR
for D3 PAK, degreased
for D3 PAK, black anodized
Reel
Reel
4.1 g
4.1 g
DV-T263-201E-TR
DA-T263-201E-TR
for D or D2 PAK, degreased
for D or D2 PAK, black anodized
Reel
Reel
3.6 g
3.6 g
DV-T268-301E-TR
DA-T268-301E-TR
for D3 PAK, degreased
for D3 PAK, black anodized
Reel
Reel
4.3 g
4.3 g
DV-T263-301E-TR
DA-T263-301E-TR
for D2 PAK, degreased
for D2 PAK, black anodized
Reel
Reel
4.1 g
4.1 g
DV-T263-401E-TR
DA-T263-401E-TR
for D2 PAK, degreased
for D2 PAK, black anodized
Reel
Reel
3.9 g
3.9 g
rev 9/20-2
172 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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