Hi,
I'm planning on using a Solid State Relay to switch a max. load of 5A, 230V. Can 8051 uC be coupled directly to a Solid State Relay? Or do I need some driving circuitry?
Please suggest a suitable SSD IC for this purpose(having both NO and NC contacts)
Thank you...

 

I believe you will need to wind your own for both states, most off the shelf SSR's are single output.
But they do come with 3v-35v input.
Max.

 

If they come with 3-35V input, then 8051 with a 5V output should be able to drive them directly?
Actually, I'm planning on eventually operating an electro-mechanical relay/contactor(230V AC coil voltage) with this circuit so that I may be able to switch loads of a much higher current rating. Any better and cheaper way to achieve this?

 

If you plan on using an AC relay in any case, then you're ok.

Simply drive the relay coil from the SSR.

 

Unless the SSR is zero crossover switching you may need to fit a R/C snubber across the coil.
Max.

 

Unless the SSR is zero crossover switching you may need to fit a R/C snubber across the coil.
Max.

Aren't SSRs made from thyristors? So shouldn't all SSRs naturally commute at zero?
Also...if possible, do tell whether this SSR has zero crossover switching...http://www.ebay.in/itm/Solid-State-...4?pt=LH_DefaultDomain_203&hash=item3a98facf34

 

Yes, but when rapid on/off switching, switch ON through Zero is often used.
Max.

 

Yes, but when rapid on/off switching, switch ON through Zero is often used.
Max.

And how do i acheive that? Simply by switching when voltage across snubber is zero?

 

https://www.fairchildsemi.com/application-notes/AN/AN-3006.pdf
Max.