4.7V 1/2W Zener Diode (5-Piece Pack)

A 4.7V zener gives a circuit a clamping or reference point set just below the common 5V logic rail, useful for overvoltage protection on a 5V-adjacent signal line or for generating a stable sub-5V reference voltage without needing a dedicated regulator chip. At 1/2W, it is sized for light signal-level duty, drawing only the small current a reference or protection circuit typically needs rather than absorbing serious power-rail surge current.