BZX79-C39,143

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The BZX79-C39,143 diode is a single industry standard Zener diode with a breakdown voltage of 39.1 Volts, and a rated power dissipation of 500 mW. This device is specifically designed for use in circuits with medium to large power dissipation and voltage rating requirements.

A Zener diode is a type of diode that, when forward biased, allows current to flow in the forward direction as normal. However, when the voltage reaches its breakdown value (also known as the Zener Voltage, or VZ), it then allows current to flow in the reverse direction. This feature makes the diode very useful in providing a consistent, regulated voltage, as any excess voltage above the VZ will be harmlessly dissipated by the diode in the form of heat.

The BZX79-C39,143 is specifically designed to provide a maximum voltage drop across the diode of 0.35 volts at 500 mW, and a breakdown voltage at 39.1 Volts. This Zener diode can be used in a wide variety of circuit designs, such as overvoltage protection circuits, voltage regulators, and voltage reference circuits, where voltage regulation and overvoltage protection are necessary. Additionally, it can be used in power supply circuits, microcontrollers, and any other circuit designs that require consistent, reliable and regulated voltages.

The BZX79-C39,143 has a maximum temperature operating range of -40°C to +125°C, providing high reliability over temperature variations. It is also constructed with a rugged glass package for both maximum reliability and environmental protection. Additionally, this diode is RoHS compliant and is available at many distributors in large quantities.

The working principle of the BZX79-C39,143 diode can be summed up by two main characteristics; its voltage regulating function and its overvoltage protection function. When the voltage across the diode reaches the Zener voltage, Vz, the diode begins to ‘break down’, allowing a reverse current which is proportional to the excess voltage over Vz (also known as avalanche breakdown). This allows the diode to regulate the voltage across its terminals and reduce the amount of current flowing through it, providing overvoltage protection.

In addition, if the voltage across the diode continues to increase, the diode will enter into a sudden, non-linear transition stage, entering into a forward biased state and allowing current to travel in the forward direction. This transition stage is known as the ‘zener breakdown’, and occurs when the voltage across the diode reaches the devices Vz.

Therefore, the BZX79-C39,143 diode is a reliable and rugged component, specifically designed for use in circuits requiring medium to large power dissipation and voltage rating requirements. With its combination of overvoltage protection, voltage regulation, and reliable glass package construction, it is the perfect component for any demanding circuits and applications.

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