The BZX55C56-TAP is a 56-V, 0.5 W silicon unidirectional surface mount Zener diode from Vishay, with Cathode indicated by dotted polarity line. It's designed for applications requiring in surge protection, clamping and noise/transient suppression. Features include a low reverse current at high temperatures, a low noise with reverse voltage, low power consumption, and a RoHS compliance with halogen-free packaging. The BZX55C56-TAP offers high reliability, low ionization voltage and is ideal for use in desktop, laptop, and notebook PCs.