# Temperature raise inside a case

I'm using a D2PACK triac model ACST830-8G datasheet

According to datasheet (over 1cm2 cooper) it supports 2A, considering Tamb = 43°

TABLE

GRAPHICS

I want to use this triac inside a case and without heat sink.

Inside a small case, can I assume this triac will handle 2A at 43 °?

I worried about this point because, as I understand, it will not be in "free air convection" as the second image says.

• Are there any other significant heat-generating components in the case? Why do you think the temperature inside the case will not exceed 43 °C? Is the case ventilated - and can it be placed in forced air flow? Is there any chance of using a metal case and a TO-220 triac which is thermally connected to the case? – Andrew Morton Jan 24 '17 at 19:50

Then no, you can't assume $2\:\textrm{A}$. Imagine that you place this inside a thermally sealed environment (perfectly so.) Then no heat energy would ever be lost and the temperature would rise forever. Reality will be between these cases, obviously. But if your circumstance is worse than "free air convection" then the temperature rise of the die will be higher and you must derate on the basis of what you know about the differences. If you can't do a finite element analysis, plus convection model, based upon a detailed physical model of your circumstances, then the next best here would be for you to make a test and find out what happens in the exact circumstance that you make and use. But if worse than "free air" you definitely will need to lower that figure.