Electronics > Repair
Triac BTB10 600BW replacement with BTA412Y 600B
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john_332:
Hi, I've got an old vacuum cleaner with a non-working speed control; after disassembling I have found that the leads of a Triac are broken.
The Triac in question is a BTB10 600BW, and I have around a BTA412Y 600B: is it equivalent? From what I see in the datasheets I would say yes, but I'm not at all expert with Triacs...

Datasheets
BTB10: https://www.st.com/resource/en/datasheet/btb10.pdf
BTA412Y: https://www.ween-semi.com/sites/default/files/datasheet/BTA412Y-600B.pdf
picburner:
The BTB10 has a non-isolated mounting tab while the BTA412 is isolated.
john_332:
That won't be an issue since the tab is mounted on a dedicated heat sink, without any connection.
What about the other data?
Ian.M:
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.
 
Even though the replacement is a nominal 12A part, I suspect that it will burn out quickly if the load current exceeds 6A and is likely to fail sooner than one would like.   You can *probably* risk testing with this part but if the vacuum cleaner is over 1200 W (nominal), or the heatsink gets hot after several minutes of operation with unrestricted air flow, I'd certainly want to order a compatible non-isolated tab TRIAC for it.

john_332:
Thanks Ian. I've soldered the BTA and changed the heatsink with a bigger one: it works but as you suspected it gets quite hot within a few minutes of operation. I think I'll leave it as it is for now, then when/if it dies...I'll order the correct one (it's super easy to replace).
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