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?
Answer
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.
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