BZV55-C27,135

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Diodes or rectifiers are electrical semiconductors that allow current to flow in one direction only. They are used in a plethora of electronic devices, such as radios, televisions, and computers. A common variant of the diode is the Zener diode, which possesses the unique property of possessing a threshold voltage or breakdown voltage which when reached, can cause an immediate, controlled breakdown that saturates the diode, rather than damaging it. The BZV55-C27,135 is one such Zener diode whose application field and working principle will be discussed in the following.

The BZV55-C27,135 is a surface mount rectifier diode with a current rating of 27.5mA, a voltage rating of 28V and a resistance rating of 135 Ohms. It is constructed with two p-n junctions and sold in a SOD-523 package. Due to its extremely small size, low leakage current and self-limiting power, it is an ideal choice for use in various electronic devices. It is also optimized for use as a voltage regulator, voltage reference, voltage stabilizer and sine wave clamp in bipolar supplies with low voltage drop.

The BZV55-C27,135 is based on the Zener diode principle, wherein the diode is specially designed to allow current to flow in one direction. As the voltage reaches a certain threshold (the Zener voltage), the breakdown (known as the Zener breakdown) is triggered, allowing a small current to flow back in the opposite direction. The Zener voltage is determined by the width of the depletion region at the p-n junction and the doping concentration.

As a voltage reference, the BZV55-C27,135 is used to maintain a steady voltage across its terminals. For this purpose, it is connected in reverse biased mode, where a constant current source is connected in series. This current source generates a constant voltage across the diode, which thereby serves as a reference point. This application of the BZV55-C27,135 is particularly useful in high frequencies and low voltage circuits, such as those found in automotive and industrial infrared systems.

As a voltage regulator, the BZV55-C27,135 is used to provide a constant voltage across its terminals regardless of the load placed on it. To achieve this, the diode is connected in series with the output circuit, and a constant current source is connected in parallel. Upon application of a load, the voltage of the output is monitored and any excessive voltage is diverted away, ensuring that the output voltage remains constant. This application of the BZV55-C27,135 is beneficial in environments which experience extreme fluctuations in voltage.

As a sine wave clamp, the BZV55-C27,135 is used to control the output voltage and limit the voltage range which the transistor can handle. In this application, the diode is connected between the input and output terminals, with the input terminal being connected to the base of the transistor. Upon application of any signal, the diode will act as a clamp, allowing only maximum voltage equal to its breakdown voltage to flow through the transistor. This prevents large voltage spikes from inhibiting the transistor, enabling it to work safely with the given signal.

In summary, the BZV55-C27,135 is a Zener diode which can be used as a voltage reference, voltage regulator, and sine wave clamp in bipolar supplies with low voltage drop. It is small in size, has low leakage current, and can be used in devices such as automotive and industrial infrared systems. Its working principle is based on the Zener diode principle, wherein the diode is specially designed to allow a current to flow in one direction when the voltage reaches a certain threshold, resulting in a controlled breakdown.

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