13V 5W 1N5350B Zener Diode (5-Piece Pack)

Many 12V-nominal supplies actually run a little above 12V in practice, and a 13V zener gives a designer the option of setting a clamping or reference threshold that accounts for that normal headroom rather than clamping right at the nominal supply voltage where it might trigger during ordinary operation. This 5W-rated part handles the same real clamping current as the rest of the series, making it a sensible choice for 12V-adjacent protection circuits that need a touch more margin than a 12V zener alone would provide.