That's correct, if you're using 22-23 VAC on the TIU, it has no problem with it, but the TVS is marginal, at least in specification. Since they do seem to die more often in the TIU than anywhere else I've seen, I figured maybe I'd just kick the spec a few volts and see if I keep getting them back. Of course, I suspect the TIU is the place where most of them are, a vast majority of the operating public doesn't have any idea what a TVS is.
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