The P4SMA550A, manufactured by Diotec, is a unidirectional ESD suppressor/TVS diode used to protect against electrostatic discharge (ESD) and transient voltage transients on telecommunications, computers, automotive, and electronic systems. It is a Surface Mounted Device (SMD), and offers a Voltage Standoff of 495V and a maximum Power Dissipation rating of 400 Watts. Its reverse voltage stand-off capability and high peak power capability make it suitable for a variety of applications. The P4SMA550A can be used for TVS functionality in computers, automotive, and telecommunications systems.