CDLL5949D

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CDLL5949D, a Zener single diode, is a kind of diode used as an active or shunt regulator or protective device under normal conduction. It is designed with an ideal maximum electric field to provide ultra-high impedance across a wide range of applied voltages, which can be suitably used for an extended range of applications.

The primary application field of the CDLL5949D is the protection of a circuit from overvoltage, usually by redirecting the current to ground when the reverse bias voltage is greater than a certain threshold level. It is typically used in protection circuits, protection from overvoltage transients, voltage clamping, voltage limiters and for power supply ESD protection. It is also used in switching power supplies as a part of a crowbar/transistor overcurrent protection.

The working principle behind the CDLL5949D is that it will maintain the maximum average reverse breakdown voltage VZ maximum for a given junction temperature until it reaches the zener knee in the I-V curve and then the current begins to flow in the reverse direction, releasing energy. The maximum electric field of the diode is designed in such a way that, when the current increases beyond VZ, the electric field and electron tunneling take over and ensure that no further increase in voltage occurs.

The low Zener impedance of the CDLL5949D makes it suitable for use in rectification and regulation circuits, enabling them to automatically adjust to different input voltage. The brake-down voltage varies between 1.0 and 8.0 Volts and generally it will turn on with a current below 5 mA. It has a stand-off value at 3V, which is useful for power rail noisers, such as diodes, LEDs and small signals.

CDLL5949D combines low leakage current and maximum reverse break-down voltage, making it suitable for all types of voltage protection circuits. Its relatively low capacitance makes it suitable for high frequency applications and the epitaxial structure prevents thermal shock. The relatively low power consumption makes it more efficient and compatible with low cost and low power applications.

In conclusion, the CDLL5949D single diode is optimized for low voltage, low power and high frequency applications, making it suitable for a wide range of applications. It is designed with a maximum electric field and high resistance, which ensures a tight regulation and long term reliability. Being a Zener type diode, it also works as a component of a variety of protection circuits, providing overvoltage protection, ESD protection and voltage limiting.

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