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TVS - Diodes

TVS (transient voltage suppressor) diodes are among the most popular and widely used components in electrical engineering today. Featuring both a low forward voltage and a higher reverse voltage, TVS diodes provide superior protection against voltage transients (surges and spikes) and are used to protect components and circuits from overvoltage damage.

The SMBJ3V3-E3/52 TVS diode is a particularly popular choice, used in many applications. It is composed of a single discrete diode, designed for transient voltage pulse suppression in applications ranging from computer peripherals to electronic ballasts and motor controls.

Application Field

In general, the SMBJ3V3-E3/52 can be used in a variety of applications, in order to help protect electronic components from damage due to overvoltage and electrostatic discharge. The diode is an integral part of numerous boards, focusing its protection on the components that may become damaged during an overvoltage.

This device is most commonly used on circuit boards with high-speed digital logic, such as DRAM, NAND Flash, and microcontrollers. It can also protect communication ports like Ethernet, USB, and audio ports, as well as power ports like AC/DC adapters. It is also often used in infrared sensors and power converters. Additionally, the SMBJ3V3-E3/52 can be used in the protection of signal lines in automotive, medical, and industrial applications.

Working Principle

At its simplest, a TVS diode works by allowing a normal flow of current in the forward direction, but blocking any flow in the reverse direction when the voltage reaches a certain point. As such, the diode will become a low resistance connection until the surge voltage reaches the "breakdown voltage" of the diode, at which point the diode will switch to a higher resistance state.

In the case of the SMBJ3V3-E3/52, the diode will switch to a high resistance state when the surge voltage reaches approximately 3.3 volts. When this happens, the current will be dramatically reduced, thus protecting the components from the harmful effects of overvoltage. The reverse surge current of the diode is also kept to a minimum, as the diode is designed to dissipate power quickly and efficiently.

In addition to its protective capabilities, the SMBJ3V3-E3/52 is also designed to provide a low leakage current, thus ensuring that any current flowing through the diode is minimal and poses no risk to the connected components.

Conclusion

The SMBJ3V3-E3/52 TVS diode is an extremely versatile component, designed to provide reliable protection against voltage transients and overvoltage. Its low forward voltage and higher reverse voltage make it particularly well suited for a wide range of applications, ranging from computer peripherals to medical electronics and more. Furthermore, the low leakage current makes it an excellent choice for designers looking for safe and reliable board protection.

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