The P6KE33A is an unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Ruilongyuan. It features a voltage rating of 45.7V, 31.4V, and 28.2V, and a standard DO-15 package with a RoHS rating. It is designed to protect sensitive electronics from voltage or current overloads, and is typically used in automotive, telecom, and industrial applications.