USB50412E3/TR7 Circuit Protection

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TVS - Diodes

TVS - Diodes are a type of semiconductor device which provides protection to electronic equipment from the hazardous effects of transients in the power supply or signal lines. They are specially designed to clamp transient voltages to a safe level and are mainly used in power supply systems, electrical circuits, and communication circuits where the transient voltage is a regular phenomenon which could potentially cause damage to the system. USB50412E3/TR7 is a high-performance transient voltage suppressor diode manufactured by Alvari Microelectronics.

Application Field of USB50412E3/TR7

USB50412E3/TR7 is a series of surface mounted TVS diodes that offers an industry-leading maximum ESD protection of 25kV for critical electronic components. It is suitable for applications in a variety of fields, such as consumer electronics, automotive, industrial, and data communication systems. Specifically, it is an ideal choice for protection of signal and power lines against lightning-induced surges in home appliances such as refrigerators and air conditioners, and automotive electronics. It is also suitable for protecting IEEE1394 lines, USB ports, HF data links, and RFID tags from ESD and EFT.

Working Principle of USB50412E3/TR7

The USB50412E3/TR7 is a two-terminal TVS diode with an anode and a cathode terminal. When a voltage greater than the breakdown voltage is applied, the device will rapidly conduct current. This allows the transient to be diverted to the ground without harming the circuit it was attempting to protect. It also helps to prevent arcing, providing additional protection. When the surge is gone, the diode returns to its non-conducting or reverse breakdown state until another over-voltage event occurs.

When a negative voltage surge or spike is applied to the anode and the cathode, the device conducts current for a brief period of time to clamp the voltage surge. When exposed to a reverse over-voltage, the device can also conduct current for a brief period of time until the voltage goes back to its normal operating value.

The TVS diode works by diverting the current away from its protected component to the TVS diode and ultimately to ground. By providing a path for current to flow away from the protected component, the TVS diode reduces the voltage seen by the protected component and prevents it from being damaged. The TVS diode works as an “ohmic resistor”, meaning that it works by creating opposing electric fields, which force the current away from the protected component.

Conclusion

The USB50412E3/TR7 is a high-performance TVS diode with excellent ESD protection of up to 25KV. It is ideally suited for signal and power lines protection against lightning-induced surges, ESD and EFT in consumer electronics, automotive, industrial, and data communication systems. Its two-terminal configuration and reverse breakdown feature allows it to function as an ohmic resistor, diverting the current away from the protected component to its anode and the cathode and ultimately to ground.

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