5.1V 1W Zener Diode (5-Piece Pack)

A 5.1V zener gives a 5V logic rail a small amount of headroom before clamping engages, which is exactly the margin needed to protect sensitive digital circuits from brief overvoltage spikes without the clamp nuisance-triggering during ordinary minor voltage ripple. As a 1W part, it is a distinct, lighter-duty product from the heavier 5W zener series covered elsewhere in this catalog, appropriate for signal-level and light power-rail protection rather than absorbing serious surge current.