SMF22A RQG Circuit Protection

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The SMF22A RQG (Reverse-biased Quiet anode and Guard Gate) is a TVS diode designed to protect sensitive equipment from over-voltage transients. It is typically used to protect low-voltage circuits from transient over-voltage events caused by short-circuit currents, electrostatic discharge (ESD) and lightning. The SMF22A RQG is available in a variety of package types and voltage ratings for a variety of applications.

The SMF22A RQG is a two-element TVS diode consisting of a diode and a guard gate. The diode is the main transient protection element. It consists of a schottky diode and an avalanche diode, both arranged in a p-n-n structure. When a voltage transient exceeds the breakdown voltage of the diodes, the guard gate shorts the avalanche diode and limits the voltage across the diode. This limits the power dissipation, resulting in improved reliability and performance.

The working principle of SMF22A RQG is straightforward. During normal operation, the guard gate is held at a low voltage relative to the anode, ensuring that very low leakage current flows through it. When exposed to a voltage transient exceeding its breakdown voltage, the guard gate conducts current, allowing the diode to clamp the transient by dissipating the excess power. This prevents damaging over-voltage transients from entering the protected circuit and reduces the risk of permanent failure.

The SMF22A RQG is widely used in a variety of applications, from consumer electronics to industrial and automotive electronics. In consumer electronics, it is used to protect digital and analog signals from over-voltage transients. In industrial and automotive applications, it is used to protect low-power circuits from high-voltage surges caused by lightning. It is also used to protect components from ESD-induced voltage transients.

Overall, the SMF22A RQG is a versatile and reliable TVS diode designed to protect sensitive equipment from over-voltage transients. It is available in multiple package types and voltage ratings, making it suitable for a variety of applications. Its features, including low leakage current, improved reliability and performance, make it the preferred choice for transient protection in low-voltage circuits.

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