I know this is a basic question, but I need to ask it.

I have always used a transistor driven by the pin of a PIC to turn on and
off high current devices (relays, buzzers whatever).  I saw a design where
someone was using an SCR.

Is there any operational difference when the application is switching not
amplifying?
Is there a signifigant cost difference?

What I am getting at is why would one use and SCR instead of a transistor.
They are even in the same TO package.

Any input appreciated.

Shawn

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