Jump to content
Electronics-Lab.com Community

Need help with SCR (Silicon Controlled Rectifier)

Recommended Posts

Hello electronics gurus of the CPF world! A LOOOOOONG time ago (in fact, I was about 15 years old), I first learned about SCR’s… Silicon Controlled Rectifiers, if memory serves. As I recall, they could be used sort of like a solid state relay, plus could be made to latch in the “on” state. In other words, I could connect one inline with a circuit, and it would act like an open switch until a momentary current was applied to its “gate” (my word, not necessarily the technical name of it), at which point the SCR became like a “closed” switch. Now here’s the interesting part: once in the “closed” state it didn’t matter if the current on the gate was removed, the SCR would remain “closed.” I read a lot of examples of Silicon Controlled Rectifiers circuits, but I am still confused.

Am I describing this part accurately, or do I have it confused with something else? I know such a component exists, but am hoping someone could explain it to me.

I’d also like to understand some basic properties for such a part…

Does it drop a voltage across it like a diode does?

Does a small amount of current “leak” even when in the “open” state?

Will it truly remain “closed” forever once tripped, so it could keep running a load for hours, days, weeks, or even months… or would it eventually “open” itself again?

Is there a significant heat buildup through this part?

Thanks in advance to whoever helps me understand all this! I appreciate your patience in dealing with such a dim electrical engineering wannabe as me. /ubbthreads/images/graemlins/blush.gif

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...