BZX85C20 A0G

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Diode is a semiconductor device with only one p-n junction and can only be a unidirectional conducting device, controllable rectifier element and voltage stabilizing element. Zener diodes are a type of diode specifically designed for regulating voltage; they are also known as “breakdown diodes” because they allow current to flow “backwards” when the voltage is high enough. The BZX85C20AO is a single Zener diode designed to regulate voltages and protect circuits from high voltages.

Features of BZX85C20AO

The BZX85C20AO is an axial-leaded, diffused Junction Zener, with a nominal Zener voltage of 20V. These are available in a variety of packages, including DO-35 and SOT-23 for surface mounting. The maximum reverse leakage current at VR is 5 nA, which provides the highest level of protection for the circuit, even under extreme conditions. The diode also features a 500 mW power rating and a 5 % tolerance, ensuring consistent performance and reliability.

Application Field of BZX85C20AO

BZX85C20AO is widely used in wide variety of applications, such as AC-DC adapters, DC-DC converters, power supplies, DC motor controllers, and over-voltage protection circuits. It is also used for electro-optical applications such as LEDs, LCDs, optical sensors, and others.

Working Principle of BZX85C20AO

The BZX85C20AO operates as a "Breakdown Diode," meaning that it allows current to flow in the reverse direction when the voltage across it exceeds its breakdown voltage. This is known as "Zener Breakdown" and is essential for voltage regulation and protection. The reverse current is limited by the Zener Impedance ZZ, which decreases as the current increases, eventually saturating the Zener diode, causing it to clamp the voltage at the Zener voltage VZ.

When the device is used in an over-voltage protection circuit, it is important that the Zener diode is connected in parallel with the protected component, as this will allow the Zener voltage VZ to serve as a clamping point and protect the component from excessive voltages.

Conclusion

The BZX85C20AO is a single Zener diode designed to regulate voltages and protect circuits from high voltages. It is a diffused Junction Zener with a nominal Zener voltage of 20V and features 500mW power rating, a 5% tolerance, and a maximum reverse leakage current of 5nA. These features make it an ideal choice for applications such as AC-DC adapters, DC-DC converters, power supplies, DC motor controllers, and over-voltage protection circuits.

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