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BTA40-600B, optocoupler and snubber

DanielGouvea
Associate

‎2025-03-29 3:02 PM - last edited on ‎2025-03-29 11:45 PM by

I intend to design a microcontroller circuit with a BTA40-600B RD91 to control the power delivered to a heating resistor (220Vrms, 12Ω, 4KW). I thought about using the MOC3023 to mediate the activation of the BTA40, but I don't know if it is the most suitable optocoupler. Another question is about the snubber circuit. The load is purely resistive, so is a snubber circuit really necessary? Thanks for the help.

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Peter BENSCH
ST Employee

‎2025-03-31 2:13 AM

Welcome @DanielGouvea, to the community!

The output current of the MOC3023 is just sufficient to control the BTA40. However, the BTA40 is not a snubberless  TRIAC and therefore requires a snubber circuit. Further information on this and the design of the snubber can also be found in application note AN5114, section 2.4.

Hope that helps?

Regards
/Peter

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