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TVS - Diodes

TVS diodes are an essential part of the electrical industry, and a key component in power supply, data line and signal line protection. One of the most popular TVS diodes is the SMCJ51HE3/9AT, which is a type of uni-directional transient voltage suppressor diode that is used for high-speed, some low-voltage protection applications. The diode is able to handle maximum surge energy of 5.8kW.

SMCJ51HE3/9AT Application Fields

The SMCJ51HE3/9AT can be used in a wide range of applications, including motherboard power supply, processor power supply, hard disk interface, and laptop external power supply. It is also suitable for signal line protection in automotive electronics, communications and consumer electronics.

SMCJ51HE3/9AT Working Principle

The SMCJ51HE3/9AT incorporates an avalanche junction which can effectively withstand ESD and excessive transient pulsed over-voltage events. When an over-voltage event is detected, the diode act as a low resistance conductor, allowing the current to flow away from the sensitive device, thus providing a fast response and protection from damages caused by these events. Once the voltage level normalizes, the operating mode will return to a low voltage threshold. When the voltage level reaches the device’s “hold over choice” threshold, the diode will latch in the on-state and provide a low-impedance path.

To ensure performance over a spectrum of surge events, the SMCJ51HE3/9AT has two designs available: one with a 9V voltage threshold and the other with a 15V voltage threshold. The 9V design offers complete protection up to 6kV while the 15V offers a 3kV protection. The SMCJ51HE3/9AT also has a built-in protection structure that makes it suitable for automotive applications.

Conclusion

Overall, the SMCJ51HE3/9AT is a widely used uni-directional transient voltage suppressor diode that offers great performance and protection in a wide range of applications. It is designed to provide fast response and can handle high surge energy with its low voltage threshold design. It is also well-suited for automotive protection applications due to its built-in protection structure.

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