Electronics > Repair
Triac BTB10 600BW replacement with BTA412Y 600B
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wraper:

--- Quote from: Ian.M on July 25, 2024, 02:59:08 pm ---On the contrary, that may well be an issue - the BTB10  600BW has a thermal resistance to mounting surface of 1.5 °C/W and Tj(max) of 150 °C, but the BTA412Y 600B is 2.1 °C/W, and Tj(max) of 125 °C.  That means that the junction of the replacement will run 40% hotter (relative to the heatsink temperature) and it has less 'headroom' to do so.

--- End quote ---
Triacs are rarely mounted on so large heatsinks and loaded so much where such small difference would really matter (it would make 6oC Tj difference with 10W dissipation and everything else equal). Actually BTA412Y has 150 °C Tj(max) but BTB10 has 125 °C Tj(max). Also it has lower VT at the same current, so will heat less.
Ian.M:
I must have either misread the BTA412Y datasheet (or flipped to the wrong datasheet), as yes I see its Tj(max) *is* 150 °C.    That gives a little more margin . . .
wraper:
I just edited the post above and it's actually better as you incorrectly wrote that BTB10 can handle 150oC
john_332:
So, in the end I received the expected BTB10 and proceeded to replace the temporary BTA412Y, just to be on the safe side.
In my tinkering with electronics I never had to actually consider factors such as thermal resistance! For what I need I usually am far inside these limits, but for a large production appliance for sure they try to save money in every way and push the components much more to their limits...
Thanks to all, I've learned something new  ;D
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