Insulated or none insulated Triac

[steffo100]

Hello all,
I need to replace a Triac on a circuit board on a 240V kitchen device and it's labled BTB16-800CW.
(B = non insulated)

I have a hard time find that type and my question is if I can replace it with a
insulated version like the BTA12-800CW (the lower current would not be an issue in this application).
Or would the BTB12-600CW be a better substitute for the 240V kitchen application (this model is also available)
Thanks in advance.

Regards
Steff

 

[tpetar]

Yes use BTA serie, its isolated.

BTA12-600 is for max 12A and 600V, and your first triac is for 16A. My suggestion is to use BTA41-600/800, and use zero crossing detection for triac control.

 

[Pjdd]

The BTA series has a higher junction-case thermal resistance due to the internal isolation, but that's compensated for by mounting the device on a heatsink without an external insulator. If the load is low enough that a heatsink is not needed, then the small difference in junction-ambient thermal resistance should not matter in practice.

OTOH, the 800V rating provides an extra margin against spikes and surges in the 240V line. So, if you're sure that the lower current rating of the BTA12 is OK, then I'd personally prefer the BTA12-800CW over the BTB16-600CW

 

[steffo100]

Thanks a lot!

The label on the machine states 500W and with a 240V line I assume that 12A would easily be enough!
I will go for the BTA12-800CW.

Again thanx!