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Curious About Diode ID

MarkMeyer

MarkMeyer

Active Member
A zener diode on my F-2663 protection board (AU-717) is marked on the diode itself with "B713".
Then on the schematic, it's called out as "RD13E (B)".

I do find some NEC cross reference to the number on the schematic, but nothing on the B713 number itself, so I'm curious if the B713 is just an old obsolete numbering system or what?
 
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With the RD numbered zeners, the digits following the 'RD' are usually the rating, i.e., that would be a 13 volt zener. Figure the wattage by its size.
 
my AU-710 lists the same RD13E(B)

marking on the parts themselves on my board is B613 (bad pics attached) so maybe your "7" and my "6" is part of the date code

I bought some 1N5243B from Fairchild on their website to replace the originals
 
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