The SM6T39A is a 3-Terminal 400V TVS Diode in the packaging type SOT-23-3L, manufactured by STMicroelectronics. The SM6T39A is a transient voltage suppressor (TVS) diode designed to protect electronic circuits from damage due to electrostatic discharge (ESD), voltage induction, and other transient events. It has a maximum peak pulse power of 400 Watts and can suppress transients up to 400V for applications such as data transmission lines, port protection, consumer and automotive applications. The SM6T39A is an RoHS-compliant and Halogen-free device with tight clearance and creepage distances. It is optimized for minimum capacitance and has a low squared dynamic resistance which results in sharper clamping characteristics.