[Early_S_Man]

Ingo,

I have had over 40 years of successful experience with International Rectifier SCRs, so it was no surprise finding an appropriate datasheet for an SCR to replace the CDI part. Trial installation of the IR parts I already had on hand, 16RIA80, worked well with no failures. Later, some 25RIA80s were tried, and they worked well, too. Recent pricing and availability checks at Newark found the qty 1 price for 50RIA80 @ $14.30, compared to $17.75 for the 25RIA80, so that seems like a good value for what should be a bulletproof solution for the CDI.

A few years ago I found some old stock Siemens CS23-10 and -12 SCRs from the '90s, and both worked quite well in the CDI units ... but those were a one-time deal, and I haven't found any equivalent Infineon parts available at all! A recent search found IXYS parts by the same number, and readily available from Digikey, so they seem like viable alternatives to the IR parts.

Finding the cheapest SCR around that will fit is not what I advocate ... considering the hassle of unsoldering the 17 wires on the board of the 3-pin CDI units.

One line of replacement parts I do not recomment is NTE ... they aren't cheap, but they also aren't JEDEC-registered, either, so I say leave them to the CB radio and audio repair techs!