The BZT52B20BS Zener diode manufactured by SLKORMICRO is a SOD-323 (Small Outline Diode) shaped diodes with a power dissipation rating of 400mW, and a Zener voltage range of 19.6V - 20.4V, designated as 20V. It is a semiconductor device that regulates voltage across its terminals by using a reverse breakdown voltage which is typically much lower than the peak forward voltage. The device is RoHS Compliant, meaning it does not contain any hazardous substances. It is used in many applications such as voltage regulation, voltage surge protection, voltage clamping, frequency stabilization, static suppression, and peak rectification.