The electronic part P6KE400A_AY_10001 is a High Voltage Transient Voltage Suppressor (TVS) diode with a DO-15 package manufactured by Panjit. It is designed to protect sensitive components, such as integrated circuits, from high-voltage surges and is compliant with Restriction of Hazardous Substances (RoHS) regulations. The device has a 400W peak pulse power rating and a working voltage of 600W, and it has been UL recognized as meeting standard UL1449 4th Edition. When used properly, it can help protect sensitive electronics from the damage that could otherwise be caused by over-voltage events.