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
FeatureS
resistors. The unique design (Patent Pending) com-
Increased sur face areas by 3 times therefore ther-
bines tin plated, solderable rods with an aluminum
mal per formance up to 300% over the aluminum
extruded heat sink body. These rods (or rollers)
stamped heat sinks on markets
are mated mechanically to the heatsink by forging to
reduce the thermal resistance between the heatsink
Light weight aluminum construction allows faster
body and the solderable feet.
pick and place assembly reducing the manufactur-
Specifically designed for use with the increasingly
ing cycle time
popular TO-252, TO-263 and TO-268 packages, the
Radius mounted Rollers are designed for maxi-
D Series affords the user superior thermal per for-
mizing heat transfer from the component and
mance over the more common stamped aluminum
avoiding the thermal bottle-neck seen in stamped
heatsinks. By eliminating the staking joint typically
and staked heatsinks.
used in stamped heatsinks, the resulting air gap and
Available in bulk packaging or tape & reel (250
thermal bottle-neck is also eliminated, while sur-
units per reel
face area for cooling is maximized with the extruded
fins of the D Series body. RoHS Compliant
Heat DiSSipation
Air Velocity (ft./min.) Air Velocity (ft./min.)
Final thermal per formance
200 400 600 800 1000 200 400 600 800 1000
is highly dependent on the
12
60 50
thermal characteristics of
14
TO-252 (D)
55
TO-268 (D3) the PCB. It is possible to see
45 10
TO-263 (D2)
a 50% drop in temp rise in
12
50
o
natural convection with a
o
101 & 201 101 & 201 8
o 40 thermally improved PCB.
o 45
10
40
35 6
8
35
301 30 4
6 301
30
25 4 25 2
264 8 10 264 8 10
Heat Dissipated (watts) Heat Dissipated (watts)
DimenSionS
0.012 / 0.30mm
TO-252 (D)
Style 10 Style 20 Style 30
TO-268 (D3) TO-263 (D2)
TO-263 (D2)
TO-268 (D3)
1.58" 1.39"
1.02"
1.22" 1.02"
40.2mm 35.2mm
25.9mm
25.91mm 30.9mm
0.50"
0.50"
0.50"
12.7mm
12.7mm
12.7mm
0.40" 0.48"REF
0.46"
10.16mm 0.27" 12.1mm
11.6mm 0.26"
0.26"
6.86mm
6.6mm
6.6mm
0.09"
0.15"
2.3mm
TO-268 (D3) TO-263 (D2)
0.10"
0.44" (11.2mm) 0.44" 3.7mm
TO-252 (D)
0.44"
2.54mm 0.64"
11.1mm
0.56" (14.2mm)
TO-263 (D2) 11.2mm
16.2mm 0.2
0.56"
0.64" (16.2mm)
14.1mm 0.76" 0.56"
TO-268 (D3)
0.2mm 19.2mm 0.2 14.2mm
0.76" (19.2mm)
(continued)
170 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com
Case Temp. Rise above
Ambient ( C)
Thermal Resistance from Mounting
Surface to Ambient ( C/watts)
Case Temp. Rise above
Ambient (C)
Thermal Resistance from Mounting
Surface to Ambient ( C/watts)D Series
Heatsink For TO-252, TO-263
and TO-268 devices
LanD p atternS
Land Patterns for D, D2 and D3
TO-252 (D) TO-268 (D3)
0.62" (15.8mm)
TO-263 (D2)
0.81" (20.6mm)
0.83" (21.1mm)
0.35" (8.89mm) TO-252 (D)
0.63" (16.0mm)
0.64" (16.3mm)
0.44" (11.2mm)
TO-263 (D2)
0.56"
0.54"
0.56" (14.2mm)
(13.7mm)
0.54"
(14.2mm)
(13.7mm)
0.06" 0.03"
0.06" 0.076" (1.40mm) (0.80mm)
TO-252 (D)
(1.40mm) (1.94mm)
0.03"
TO-263 (D2)
(0.80mm)
t ape anD reeL orDering inFormation
Reel diameter: 13.00 (330.00mm)
Style RoHS
200 pcs. per
10, 20 or 30 Compliant
K0 P1 P0
DA-T263-201E-TR
Series Finish Package Length Tape & Reel
D A = black anodized T263 = TO-263 1 = 0.50"
V = degreased (or TO-252) 2, 3, 4 = optional lengths
S0 W T268 = TO-268 assigned
sequentially on
customer request
Standard part numbers For D Series
D0 Part Number Description Packaging Weight
DV-T263-101E for D2 pack, degreased Bulk 3.8 g
Style 10 Style 20 Style 30
DA-T263-101E for D2 pack, black anodized Bulk 3.8 g
D0 1.55mm 1.5mm 1.5mm
DV-T263-101E-TR for D2 pack, degreased Reel 3.8 g
DA-T263-101E-TR for D2 pack, black anodized Reel 3.8 g
K0 10.5mm 12.20mm 11.50mm
DV-T268-101E for D3 pack, degreased Bulk 4.1 g
P0 4mm 4.0mm 4.0mm
DA-T268-101E for D3 pack, black anodized Bulk 4.1 g
P1 24mm 24mm 24.0mm
DV-T268-101E-TR for D3 pack, degreased Reel 4.1 g
DA-T268-101E-TR for D3 pack, black anodized Reel 4.1 g
S0 40.4mm 40.4mm 52.4mm
DV-T263-201E for D or D2 pack, degreased Bulk
W 44mm 44mm 56mm
DA-T263-201E for D or D2 pack, black anodized Bulk
DV-T263-201E-TR for D or D2 pack, degreased Reel
DA-T263-201E-TR for D or D2 pack, black anodized Reel
Removable Kapton
DV-T268-301E for D3 pack, degreased Bulk
tape on each part
DA-T268-301E for D3 pack, black anodized Bulk
facilitates handling
DV-T268-301E-TR for D3 pack, degreased Reel
by automatic pick
DA-T268-301E-TR for D3 pack, black anodized Reel
and place equipment.
DV-T263-301E for D2 pack, degreased Bulk
Style 10 tape and
DA-T263-301E for D2 pack, black anodized Bulk
reel only. DV-T263-301E-TR for D2 pack, degreased Reel
DA-T263-301E-TR for D2 pack, black anodized Reel
1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info@ohmite.com 171