SMCJ78A-E3/9AT

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TVS (Transient Voltage Suppressor) diodes provide protection against voltage transients caused by induced lightning, electrostatic discharge, and other voltage spikes. Utilizing a combination of PN junction diode architecture and avalanche breakdown effect, these diodes have significant power handling and voltage clamping capabilities. SMCJ78A-E3/9AT is one such TVS diode, which offers protection against surge pulses up to 10A and up to 8.2kW peak pulse power.

The SMCJ78A-E3/9AT is a unidirectional device, designed for bidirectional applications with two discrete devices. This device is comprised of a pair of Zener protected PN junction diodes. The circuit is optimized to provide maximum surge current protection with very low local circuit capacitance. The low capacitance ensures fast response time, essential for protecting sensitive components and circuits.

The SMCJ78A-E3/9AT can be used in a variety of applications, including consumer electronics, automotive and industrial electronics. In consumer electronics, the device is used to provide surge protection to circuits that are vulnerable to electrical transients. It can also be used for circuit isolation applications, such as for protecting DC/DC converters from voltage surges. In automotive and industrial applications, the device can be used to provide surge protection for circuit boards, and to help extend the life of sensitive components.

The working principle of the SMCJ78A-E3/9AT is based on the fact that when a PN junction diode is biased in the forward direction, it operates in the so-called avalanche breakdown region. In this region, a sharp increase in current occurs as the applied voltage reaches a certain threshold, known as the breakdown voltage. The breakdown voltage of the diode depends on the doping concentration and depth of the junction.

When the diode is subjected to a large voltage transient, the breakdown voltage is exceeded and the diode will experience current saturation. This saturation current causes the device to act as a hot wire, deflecting the surge current away from sensitive electronic components in its vicinity. Once the surge current is dissipated, the normal operation of the diode resumes.

The SMCJ78A-E3/9AT device offers very useful power and voltage clamping capabilities, and is designed to protect a variety of electronic components, circuits and systems from voltage transients. With its low local circuit capacitance, it ensures fast and reliable protection, making it ideal for a wide range of applications.

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