CDLL4742A

The CDLL4742A belongs to the “Diodes - Zener - Single” group of devices, and represents a versatile and useful tool for working in the field of the power supply and the protection application. The device is composed of a Zener diode and a standard silicon diode, connected in a parallel type configuration which allows the functioning in two different ways.

The first way of functioning refers to the power supply application and its working principle is based on theForward Biasing voltage. This means that the reverse current is blocked and the forward current is allowed to flow until an overvoltage determined by the Zener diode is reached. After the value of the breakdown voltage is crossed, the current starts to flow through the Zener diode and the power supply application is achieved.

The second mode of functioning is related to the protection application of the CDLL4742A and the working principle is based on the Reverse Polarity protection. This means that the forward current is blocked, but the reverse current is allowed. The amount of the reverse current is determined by the applied voltage and the breakdown voltage of the Zener diode. When the reverse voltage exceeds the value of the breakdown voltage, the Zener diode starts to conduct and the protection is achievable.

The applications which can benefit from the combination between the two components of the CDLL4742A are multiple and can involve, for instance, the protection of semiconductors from the high voltage, the clippers and clampers working in both huge and small impediments, the suppression of spikes in the power supplies and the absolute protection of circuits and components from over voltage.

In conclusion, the CDLL4742A belongs to the “Diodes - Zener - Single” group of components and provides a way to work in different power supply and protection applications by combining in a single component two diodes, a Zener and a standard, connected in a parallel type configuration.