Aavid offers one-piece cooling solutions for TO-220s, TO-126s, and TO-247s. Each model is specially designed with an
integrated clip to hold and cool a specific discrete power device.
A range of solderable pins are available for the M3 and M4 slots in all of the extrusions in this brochure, as well as for our
standard range, with or without a standoff. We can provide automatic assembly of solderable pins to specified pitch and
depth. 78065 Indian Chief (for TO-220)
lb/ft:0.331 kg/m:0.493 • Rthn = 2.15 °C/W • Rthn = 0.73 °C/W
Anodized heat sink thermal resistance (°C/W)
Length Natural Forced ConvectionForce on
Part Number (inches)convection1 m/s 2 m/s 3 m/s component (lb)
780653B005900.59 13.31 5.46 4.09 3.35 12.10
780653B007900.79 10.66 4.30 3.20 2.60 15.68
780653B009800.98 8.97 3.58 2.65 2.15 19.04
780653B011801.18 7.77 3.08 2.27 1.84 22.40
Blank heat sink thermal resistance (°C/W)
Length Natural Forced ConvectionForce on
Part Number (inches)convection1 m/s 2 m/s 3 m/s component (lb)
780653U005900.59 16.18 6.05 4.41 3.56 12.10
780653U007900.79 13.02 4.76 3.44 2.77 15.68
780653U009800.98 10.98 3.96 2.85 2.28 19.04
780653U011801.18 9.55 3.41 2.45 1.96 22.40
The heat sink thermal performance is evaluated
in the vertical mode at a DT of 70°C.
78240 Big Chief (cool's TO-247's)
lb/ft:0.421 kg/m:0.627 • Rthn = 1.74 °C/W • Rthn = 0.58 °C/W
Anodized heat sink thermal resistance (°C/W)
Length Natural Forced ConvectionForce on
Part number (inches)convection1 m/s 2 m/s 3 m/s component (lb)
782403B005900.59 10.71 4.49 3.40 2.80 12.10
782403B007900.79 8.58 3.53 2.65 2.17 15.68
782403B009800.98 7.22 2.93 2.19 1.79 19.04
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782403B011801.18 6.26 2.53 1.88 1.53 22.40
Blank heat sink thermal resistance (°C/W)
Length Natural Forced ConvectionForce on
Part Number (inches)convection1 m/s 2 m/s 3 m/s component (lb)
782403U005900.59 12.96 4.49 3.40 2.80 12.10
782403U007900.79 10.42 3.53 2.65 2.17 15.68
782403U009800.98 8.79 3.93 2.19 1.79 19.04
782403U011801.18 7.66 2.53 1.88 1.53 22.40
The heat sink thermal performance is evaluated
in the vertical mode at a DT of 70°C.
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