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D Series Heatsink0 pages
HEATSINK
D Series
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.
THERMAL
MANAGEMENT
Heatsink For TO-252, TO-263
and TO-268 devices
F e at u r e s
•tIncreased surface areas by 3 times therefore thermal performance up to 300% over the aluminum
stamped heat sinks on markets
•tLight weight aluminum construction allows faster
pick and place assembly reducing the manufacturing cycle time
•tRadius mounted “Rollers” are designed for maximizing heat transfer from the component and
avoiding the thermal “bottle-neck” seen in stamped
and staked heatsinks.
•tAvailable in bulk packaging or tape & reel (250
units per reel
•tRoHS Compliant
H e a t d i ss i p a t i o n
Air Velocity (ft./min.)
1000
50
14
12
50
101 & 201
45
10
40
8
35
301
6
30
Case Temp. Rise above
Ambient ( C)
800
TO-252 (D)
TO-263 (D2)
55
Case Temp. Rise above
Ambient ( C)
600
Thermal Resistance from Mounting
Surface to Ambient ( C/watts)
60
400
2
4
6
8
Heat Dissipated (watts)
400
600
800
1000
12
TO-268 (D3)
45
10
101 & 201
40
8
6
35
30
4
301
25
4
25
200
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.
2
2
10
Thermal Resistance from Mounting
Surface to Ambient ( C/watts)
Air Velocity (ft./min.)
200
4
6
8
Heat Dissipated (watts)
10
dimensions
Style 10
TO-252 (D)
TO-263 (D2) TO-268 (D3)
1.02"
1.22"
25.91mm
31.0mm
Style 20
0.10"
2.54mm
0.27"
6.86mm
0.48"REF
12.1mm
0.44" (11.2mm)
0.56" (14.2mm)
TO-252 (D)
TO-263 (D2)
0.63" (16.1mm)
0.75" (19.1mm)
2
1.58"
40.2mm
0.50"
0.50"
12.7mm 12.7mm
0.50"
12.7mm
0.40"
10.16mm
Style 30
1.02"
25.9mm
TO-268 (D3)
0.26"
6.6mm
0.44"
11.1mm
0.56"
14.1mm
0.46"
11.6mm
0.09"
2.3mm
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
0.26"
6.6mm
0.64"
16.2mm
0.76"
19.2mm
0.15"
3.7mm
