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VM Series
Variable Mount Heatsink Series
Ohmite introduces this new versatile heatsink
design. This new design can accommodate several
different industry packages. This design also lets the
customer choose a mounting style using screws or
clips for secure mounting to the heatsink. These one
of a kind heatsinks are offered in a vertical (free con-
vection cooling) or horizontal format (forced convec-
tion cooling) to fit customer applications.
Horizonral
Mounting Style
Vertical
Mounting Style
CHARACTERISTICS
Heatsink Surface Area Weight Length L or Surface
Part Number Mount (in
2
/ mm
2
) (oz / g) Height H (mm) Finish
VM1-038-1AE vertical
VM2-038-1AE horizontal 39.6 / 25,546 1.48 / 42 38.6 anodized
VM3-038-1AE universal
SERIES SPECIFICATIONS
(continued)
Heat Dissipation
800400 600
60
Heat Dissipated (watts)
40
20
10
0
155 100
50
30
20
80
1.4
1.6
0.6
0.4
0.2
0
0.8
1.0
1.2
0 200 700300 500100
Air Velocity (ft./min.)
70
Mounting Surface Temp. Rise
above Ambient (°C)
Thermal Resistance from Mounting
Surface to Ambient (°C/watts)
Heat Sink
Aluminum Alloy 6063-T5 or Equivalent with either degreased or
black anodized finish
Solder Foot
Cold-rolled Steel, Per ASTM A-366 with pure tin over copper
strike. RoHS compliant. Barbed for secure attachment
Interface Thermal
Resistance
for improvement, use thermal joint compound, 0.005 Grafoil
(TGon 800 by Laird), or phase change material (Hi-Flow by
Bergquist) Insulator (Optional) Sil-Pad 900-S, K6 800-S and
K10 by Bergquist
