SA28CAHB0G Circuit Protection

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TVS - Diodes and the SA28CAHB0G

TVS (Transient Voltage Suppressors) and Diodes are protective devices used to protect electronic circuits from over voltage events and electrical transients caused by the effects of lightning, electrical spikes, electrostatic discharge, and power faults. They are used in all kinds of consumer and industrial applications, from car electronics to communications systems, where reliable protection is required.

The SA28CAHB0G is an ultra-low capacitance TVS Diode used for ESD and EFT protection. It is an unidirectional device, meaning that it will only allow current to flow in one direction.

Application Field

The SA28CAHB0G is designed for use in sensitive, high-speed communications circuits, where transient voltage protection and EMC/EMI/RFI filtering is required. It has low capacitance (19pF max.) and a fast response time (less than 1ns typical). This makes it ideal for applications such as Ethernet, Gigabit Ethernet, and PoE (Power over Ethernet), where high speed data transfer is required.

It is also suitable for many other sensitive electronics such as audio, high-speed computers, and automotive electronics, where over-voltage and electrical transient protection is required. It can be used in both consumer and industrial equipment, as well as in hazardous areas where safety is a concern.

Working Principle

The SA28CAHB0G contains three critical components: a TVS diode, an inductor, and a capacitor. The TVS diode is a low-capacitance device that acts as a voltage clamp, suppressing voltage transients to safe levels. The diode turns on quickly when a transient exceeds its breakdown voltage, thus providing fast protection.

The inductor and capacitor are connected in series. They form an LC filter, which helps provide additional EMC protection. This filter helps reduce high frequency noise introduced by the transient. It also helps to limit the inrush current (the current drawn when a device is turned on) that can cause unwanted power-up issues.

The combination of the TVS diode, inductor, and capacitor provides superior ESD and EFT protection, and also helps reduce EMC/EMI/RFI issues.

Conclusion

The SA28CAHB0G is an ultra-low capacitance TVS Diode that is designed for use in sensitive, high-speed communications circuits. It provides both ESD and EFT protection, and helps reduce EMC/EMI/RFI issues. It can be used in consumer and industrial applications, and is suitable for a wide range of applications where over-voltage and electrical transient protection is required.

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