9

PC3ST21NSZ Series

Sheet No.: D2-A07101EN

✩ For additional design assistance, please review our corresponding Optoelectronic Application Notes.

● Standard Circuit (Medium/High Power Triac Drive Circuit)

Triac

Load

PC3ST21NSZ

Note) Please add the snubber circuit according to a condition.

Any snubber or varistor used for the above mentioned scenarios should be located

as close to the main output triac as possible.

4

3

1

2

AC Line

Zero Crossing

Circuit