SMCJ78CA-E3/57T

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The SMCJ78CA-E3/57T is a device categorized under TVS (transient voltage suppressor) diodes. It is designed to protect vulnerable components and circuits in a wide variety of applications from surges and transients. This article provides an overview of the application fields and working principle of the SMCJ78CA-E3/57T.

The SMCJ78CA-E3/57T has a maximum clamp voltage of 600 W and a peak pulse power dissipation of 1500 W. It is constructed by two back-to-back Zener diodes and is designed to offer protection for lines that need to carry data along with currents up to 2.5A. This makes it ideal for applications such as communications interface and telecommunications, computers, medical equipment, consumer electronics, security, and instrumentation. Furthermore, it is capable of reliable protection from 3 to 48 VDC against transients from 6000 W peak current or 8V/μs rate of rise.

In terms of typical applications, the SMCJ78CA-E3/57T is most commonly employed at input and output lines as a line of defence against ESD, EFT, surge current, and pulsed power transients. It provides protection from adverse transient effects and helps to reduce accidental downtime due to high transient levels. Furthermore, it helps to reduce energy hazards and is often used to replace traditional MOV and GDT devices. Additionally, within the telecom industry, the SMCJ78CA-E3/57T is primarily used to protect against high voltage transients that occur on PCB, DSL, dial-up, and ISDN lines.

In addition to having wide application fields, the SMCJ78CA-E3/57T also works on the principle of avalanche breakdown. This generally involves the formation of a thin conducting channel in the depletion region which adds extra positive charge and redirects current flow away from the sensitive components. The amount of current and voltage flowing through the SMCJ78CA-E3/57T is clamped when the avalanche breakdown phenomenon occurs. As a result, the device acts as a switching device with the aim of limiting or redirecting large surge currents.

Due to its unique design and working principle, the SMCJ78CA-E3/57T serves as an optional safeguard against adverse transient effects which may lead to permanent damage to data lines and other sensitive components. It can help to reduce the risk of costly repair efforts and unwanted downtime, while providing the ultimate protection from interference and voltage surges.

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