The BZT52B4V3JS-TP by Micro Commercial Components (MCC) is a Zener diode that has a maximum power rating of 200 mW, a forward voltage of 0.9V, zener voltage of 4.21V, reverse voltage of 1.0V, and a maximum rated current draw of 2.7uA. The device is housed in an SOT-23 package, is RoHS compliant, and is a RoHS / Marking compliant component. It is designed for use in a variety of electronic applications such as supply regulation, voltage clamping, voltage regulation, and signal conditioning.