16
\$\begingroup\$

I'm looking at triac datasheets, in particular this datasheet for BTA16 series triac. The "electrical characteristics" section is split into two parts: snubberless/logic level (3 quadrants) and standard (4 quadrants).

I have no idea what this is referring to. Are they different devices, as suggested by the column titles? Are they different operating modes? What is the difference?

\$\endgroup\$

2 Answers 2

11
\$\begingroup\$

NXP has a good explanation as to what the differences between 3-quadrant and 4-quadrant triacs are.

Summary: a 3-quadrant triac cannot be turned on in the fourth quadrant (T2 negative, G positive) which is beneficial when dealing with inductive loads - ringing caused by sudden turn-off could potentially turn on a 4-quadrant triac, necessitating snubbers and other protection means to prevent spurious conduction.

\$\endgroup\$
2
2
\$\begingroup\$

3-Q Triacs don't operate in 4th quadrant i.e positive gate current and negative load current. Please see the link I ve shared http://en.wikipedia.org/wiki/File:TRIAC_Equivalent_Circuit.png. You will get an insight of the working of a TRIAC

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.