Man, I wish I would have known about this a few weeks ago when I was working on repairing a water damaged controller board from an electric smoker. Fortunately, the damaged components were not the mysterious SOT-23 devices labeled only "S3", but just a couple shorted-out diodes. Without this page, it would have been quite frustrating trying to source a new "S3" were it blown out, as I wouldn't have been able to measure polarity or hFE to narrow down a short list of candidates.
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