Contents
What is case to 220 case to heatsink?
TO-220 Case-to-heatsink thermal resistance is discussed in these two application notes: Fairchild: AN-4166 Heat Sink Mounting Guide, and Philips Semiconductors: Mounting instructions
How to calculate power dissipation in MOSFET thermal resistance?
・The power dissipation is obtained by calculating backward to the power loss for which T J does not exceed the absolute maximum rating. ・Specified values, absolute maximum ratings and the like must be considered paying attention to the stipulated conditions.
Which is lower case to heatsink or ambient?
I explain that the case-to-heatsink thermal resistance is much lower than the heatsink-to-ambient thermal resistance, because the first is conduction and the second convection.
How to calculate the thermal resistance of a heatsink?
I suppose it will vary somewhat with the type of heatsink and mounting used, but does anyone have a ballpark figure? Rja = Rjc + Rcs + Rsa. Where: a = air, j = junction, c = case, s = (heat)sink Rjc & Rsa are reasonably fixed by component choices.
What is the thermal resistance of the TO-220?
TO-3P has a typical junction-to-ambient (heatsink) thermal resistance of only about 40 °C/W, and its TO-3PF variant a slightly lower one. Further increase of heat dissipation capability is possible with power modules . When a TO-220 package is used without a heatsink, the package acts as its own heatsink, and the heatsink-to-ambient thermal
Can a TO-220 be used with a heat sink?
As a complement to the other answers, here is an equivalent circuit with which you should be able to work out whether your component can handle the dissipated power, be it a TO-220 or any other package, with or without a heat sink.
When to change case to sink thermal resistance?
If your data sheet dies not give case to sink thermal resistance (usually Rjc or similar) then change manufacturers – this is one of the most fundamental thermal parameters and ALL manufacturers ‘worth their salt’ will supply it. You can look it up for a handful of TO220 packages to get a feel.