The SMA4F15AH with ESD Suppressors/TVS Diodes 400W, 17.7V, 5%, Unidirectional, TVS is manufactured by Taiwan Semiconductor. It is a transient suppressor diode for applications such as electrostatic discharge protection, power supply line protection, automotive power circuitry protection, cellular phone protection, and other communication systems. The device is designed to suppress large voltage transients and other over-voltage conditions that occur in power supplies and data communications lines. It comes with a low clamping voltage and fast response time to improve product reliability. The device also features a high power dissipation and transient surge rating. The unidirectional device provides ESD protection for four lines.