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Diodes - Zener - Single

The BZX84J-B75,115 is a single diode in a DO-35 package, specifically designed to be used as a Zener diode. This makes it perfect for circuit protection as a means of controlling, clamping, and regulating voltages. Zener diodes are diodes that are specifically designed to allow current to flow in reverse direction and are part of a family of semi-conductor devices known as avalanche diodes. This diode has the special feature of a zener breakdown voltage of 8.2 V. The reverse voltage breakdown parameters of the diode are 75 mA and 115 mV, thus making it suitable for use in a variety of applications.

Working Principle

Zener diodes are a type of diode specifically designed to allow current to flow in the reverse direction. When the applied reverse voltage exceeds the breakdown voltage of the diode, the Zener diode reduces the voltage to a safe level, making it ideal for voltage regulation and clamping. The voltage breakdown point is referred to as the Zener voltage, while the maximum reverse current rating is known as the Zener current. The direction in which current flows depends on the type of diode used in the circuit, with majority carriers flowing in the forward direction, while minority carriers flow in the reverse direction.

When a reverse voltage is applied to a Zener diode, the free electrons in the N-type semiconductor material in the depletion layer diffuse across the junction into the P-type material and combine with the positive charge carriers, creating an excess of minority current carriers. This causes a strong electric field (referred to as the Zener effect) to develop across the PN junction. The electric field in turn causes a significant increase in reverse current, allowing for current to flow in the reverse direction and limit the voltage to the Zener level.

Application Fields

The BZX84J-B75,115 has a wide range of applications, including being used in voltage regulation, clamps, and series regulators. The diode is used in telecommunication systems to regulate noise levels, ensure stable power supplies, and protect against circuit misoperation. It is also well suited for applications such as over voltage protection, voltage stabilization, light dimmers, and inverter circuits. Furthermore, it can be used in automotive circuitry as a means of balancing several circuits and produced excess voltages in the system. The device also has applications in switching power supplies, television set protection, and systems involving complex circuitry.

The diode’s relatively small size of just 1.8mm by 4.8mm makes it suitable for constructing small modules. This feature makes the diode the perfect choice for applications requiring a compact power supply design such as laptop adapters or other small electronic devices. It is also ideal for use in applications such as power line communication where a compact design is required.

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