Share:
Notifications
Clear all

Tech Chat Thyristors

 
crustytv
(@crustytv)
Vrat Founder Admin

Would fellow V-ratters know of a source to obtain new RCA-17022 & RCA-17023 Thyristors? The equivalents I believe are S3900 & S3901, but again I'm having a devil of a job even locating those. I did find one source in Germany, but they're £7+ each and that's not accounting for postage, then import duty which is now applicable.

I've looked everywhere, including e-bay (no e-bay links please) and I'm coming up with a big fat zero. Any help greatly appreciated, I'm looking to buy a good batch of them, so numbers available is important. Perhaps members are aware of other equivalents that I am not, so I can extend my search? If so, please educate me.

I can't see what the difference is between a 22 & 23 other than the Tq & Ig values, which I'm assuming is relevant to their circuit locations and functions.

thyristors
ReplyQuote
Topic starter Posted : 28/09/2021 11:50 am
Topic Tags
Nuvistor
(@nuvistor)
Famed V-Ratter Registered

@crustytv 

If you can’t find them Chris, I have no chance.

Hope someone can help.

 

ReplyQuote
Posted : 28/09/2021 11:54 am
Cathovisor
(@cathovisor)
Illustrious V-Ratter Registered

The biggest single issue is the switch-off speed; plenty of thyristors match for voltage and current - even gate trigger current -  but the lowest value of Tq I can find it 15µS which is way too much in this application.

I think you may have to bite the bullet and face the import duty.

ReplyQuote
Posted : 28/09/2021 3:21 pm
jcdaze
(@jcdaze)
Trusted V-Ratter Registered

The 18052 basic specs look similar and seem to be available in UK. Haven't looked in any great detail though.

 

ReplyQuote
Posted : 28/09/2021 3:35 pm
crustytv
(@crustytv)
Vrat Founder Admin

Yes, they do look viable, however I'd need a source other than e-bay. This is stretching the rule taught. The ones which are available have a high risk of being china fakes. There was a thread on UKVRRR where a chap no end of troubles from that source.

thy2
ReplyQuote
Topic starter Posted : 28/09/2021 3:52 pm
jcdaze
(@jcdaze)
Trusted V-Ratter Registered

Donberg list a RCA 1802 Salora thyristor, can't find any specs for it though.

ReplyQuote
Posted : 28/09/2021 5:21 pm
crustytv
(@crustytv)
Vrat Founder Admin

After much reading, there are lots of equivs


For 17022:  17052, 17056, 17074, 17088, S3900

 

For 17023: 17053, 17057, 17075, 17089, S3901

ReplyQuote
Topic starter Posted : 28/09/2021 8:04 pm