The SMCJ70A-E39AT with Vishay Semiconductors TVS Diodes - Transient Voltage Suppressors 1500W 70V Unidirect is an electronic component manufactured by the Vishay Semiconductor company. This device is a unidirectional TVS diode designed to offer transient voltage protection up to 1500 watts for devices and peripherals connected in a 70-volt systems. The diode works by clamping the voltage to a safe level, thereby providing circuit protection against voltage surges, spikes, and ESD pulses. It also features fast response times of less than 1.0ns for both stand-off and clamping voltages. Typical applications for this device include server power hubs, USB protection, telecom line interface protection, and LCD and LED panel protection.