(Topic ID: 344777)

SCR Substitute Question

By Nchezey_5916

6 months ago



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#1 6 months ago

I’m in the middle of ordering some SCRs for a board that I’m working on and it would appear that transistor MCR106-1 (which is called out in the manual/BOM) is no longer available. Does anyone know if MCR106-8 is an acceptable substitute and if there would be any undesirable side effects of switching to these?

#2 6 months ago
Quoted from Nchezey_5916:

transistor MCR106-1 (which is called out in the manual/BOM) is no longer available.

Might help to know what game/manual/BOM you're talking about.

#3 6 months ago
Quoted from sparky672:

Might help to know what game/manual/BOM you're talking about.

Didn’t think all that mattered, thought it was more of a generic question. I suppose application could make a difference though.

It’s for a Bally 6803 (Eight Ball Champ). The SCRs that control the playfield lamps.

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#4 6 months ago

MCR106-8 is an acceptable substitute. Use with confidence.

#5 6 months ago
Quoted from JethroP:

MCR106-8 is an acceptable substitute. Use with confidence.

Awesome! Thank you for confirming.

#6 6 months ago
Quoted from Nchezey_5916:

Didn’t think all that mattered, thought it was more of a generic question. I suppose application could make a difference though.

Yes, true. I was also thinking about people that search Pinside by game name.

#7 6 months ago

This is a great part to buy from LCSC. Western brands are asking like $1ea when you can get them from Asian brands for like $0.10 or less. C106 is a good sub. I think X0405 it is works as well and can be had for cheap.

This KY brand is fine, used a bunch in the TO252 package.
https://www.lcsc.com/product-detail/TRIACs_KY-C106M_C2831676.html

https://datasheet.lcsc.com/lcsc/2205161616_FUXINSEMI-X0405C_C3018489.pdf

#8 6 months ago
Quoted from Nchezey_5916:

MCR106-1 (which is called out in the manual/BOM) is no longer available. Does anyone know if MCR106-8 is an acceptable substitute

The datasheets tells the difference between the two. The MCR106-1 survives in circuits to a maximum of 30 volts. The MCR106-8 survives in circuits to a maximum of 600 volts. There is no other difference in their specs.

Did you determine from your other related thread whether the SCRs were faulty from the test procedures I mentioned? 15-20 SCRs being faulty seems a stretch.

MCR106.pngMCR106.png

#9 6 months ago
Quoted from Quench:

The datasheets tells the difference between the two. The MCR106-1 survives in circuits to a maximum of 30 volts. The MCR106-8 survives in circuits to a maximum of 600 volts. There is no other difference in their specs.
Did you determine from your other related thread whether the SCRs were faulty from the test procedures I mentioned? 15-20 SCRs being faulty seems a stretch.
[quoted image]

I just replied back to the other thread, but in short am currently testing. I prematurely ordered a handful of both SCR types, in hopes that if it did end up being the issue, I would be able to resolve more quickly.

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