BZA420A,125

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TVs-Diodes, a form of overvoltage protection devices, plays an important role in many electronic devices and circuits. BZA420A,125 is an example of these protective diodes, which are widely used in the electronic industry. This article will discuss the application field and working principle of BZA420A,125.

BZA420A,125 is an unidirectional TVS diode specially used to protect sensitive circuits from ESD (electrostatic discharge) and transient voltage surges. It is suitable for energy spikes in the range of 2V-25V peak, and the repetitive peak clamping voltage at I/P is 40V~150V (8/20μs waveform) It has a compact package designed in SC75 and SMPC offers additional PCB space savings and can effectively prevent high current overvoltage damage. Besides, it also has a low leakage current and excellent clamping capability, which make it ideal for use in sampling applications, such as medical, industrial, and consumer electronics, etc.

As for the working principle, the operation of the BZA420A,125 relies on the Avalanche effect, one of the protective capabilities of diode. When a transient voltage surge across the diode in the opposite direction, it will entrant the breakdown region and generate a sudden current through the diode, which is known as the avalanche effect. When the breakdown voltage reaches a certain level, the diode will quickly become conductive and form a low resistance path between the two terminals. Therefore, the destructive surge current can be quickly diluted and discharged, thus protecting the connected circuit from the damage of high voltage. In addition, this diode contains an additional PN junction, which is designed to limit the amount of energy that can be transmitted to the protected circuit.

In sum, BZA420A,125 TVS diode can provide fast overvoltage protection and ensure the stable operation of the circuit. It has wide application in medical, industrial and consumer electronics, etc, and has advantages such as low leakage current and excellent clamping capability. Its working principle is based on the Avalanche effect and PN junction to protect the circuit from high voltage damage. Thus it is no doubt a reliable and economical solution for overvoltage problems.

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