SMCJ22HE3/57T

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TVS - Diodes

A TVS - Diode is a solid state device which is mostly used for protection of circuits from transient voltage and current spikes, commonly called electrical surges. The device consists of various doping layers of semiconductor material which sandwich a heavily doped region. This heavily doped region is the core of the device and is what grants it its electrical resistance. It works by quickly responding to the transient voltage or current and limit the signal by providing an alternate conduction path. The most common type of TVS diode is the SMCJ22HE3/57T.

SMCJ22HE3/57T Application Field and Working Principle

The SMCJ22HE3/57T is a Transient Voltage Suppressor (TVS) Diodes with ESD suppression capabilities. It is designed to protect voltage sensitive components from damage due to Electrostatic Discharge (ESD) and other sources of overvoltage such as transient electrical surges from lightning strikes or static electricity. The device can also be used to control ESD energy in high speed communication links.

The device has an operating breakdown voltage of 22 volts and a maximum power dissipation of 500mW. It has an ultra-fast response time of around 5ns, with a low clamping voltage of 28.4 volts, clamping current of 3.3 amps, and a low dynamic resistance of 0.02 Ohms. The device is made from a dual Schottky diode array built on a hermetic ceramic substrate with an ultra-low capacitance of 0.5 pF. This gives it superior ESD surge protection in a range of applications.

The working principle of the SMCJ22HE3/57T is similar to that of other TVS Diodes. When the input voltage exceeds the diode’s breakdown voltage, the diode gets forward biased and the bipolar junction begins to conduct. This causes a surge of current which is limited and dissipated in the Zener impedance of the device. The device’s ultra fast reaction time ensures that no significant damage is caused to the protected equipment.

The SMCJ22HE3/57T offers superior surge protection and ESD protection in both automotive and consumer electronics applications. Its ultra low capacitance and fast response time also makes it a suitable choice for protection against ESD noise in data and communication lines. The device is built on a hermetic ceramic substrate which makes it reliable and robust even under extreme conditions.

In summary, the SMCJ22HE3/57T is a TVS Diode with fast response time and low capacitance which is designed for surge protection and ESD protection in a variety of applications. It offers superior ESD immunity and bandwidth while its small size also makes it well-suited for space constrained designs.

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