BZX384C75-HE3-18

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A diode is an electrical device that permits the flow of electricity in one direction. The BZX384C75-HE3-18, part of the Zener diode family, is a single, compact diode that enables simple circuit protection. It has an application field in controlling and protecting the circuit from potential damage. This article will provide a brief overview of the BZX384C75-HE3-18, exploring its application field and working principle.

Overview

The BZX384C75-HE3-18, made by STMicroelectronics, is a type of diode in the Zener diode family. It is capable of protecting circuits against transient overvoltages and contains two terminals, an anode and a cathode. This diode is typically used in circuit protection and is capable of controlling the voltage levels in a circuit. It is constructed in a small SOD-323 package which measures 0.76 mm in width and 1.48 mm in length.

Application Field

The BZX384C75-HE3-18 is primarily used as an over-voltage protection device. It is suited to applications that require protection from high over-voltage transients, such as those from electrostatic discharge or from switching noise. Such transient protection is useful for preventing the premature end of life of components used in the circuit. The protection diode can also act as a surge arrester, capable of clamping voltage sources at their lower thresholds so as to limit their power dissipation or prevent excessive voltage build-up.

In addition to over-voltage protection, the BZX384C75-HE3-18 can be used to prevent the readjustment of transistors due to prolonged exposure to voltage above the maximum ratings. By allowing the effective voltages to be clamped at the specified levels, this diode helps protect sensitive components from damage.

Working Principle

The BZX384C75-HE3-18 functions based on the reverse current blocking principle. This diode works by allowing current to flow in one direction, while not permitting it to flow in the opposite direction. When the reverse voltage across the diode exceeds a certain amount (the Zener Voltage) the diode will break down and permit the current to flow in both directions, thereby reducing the voltage across the diode and clamping it at the specified level.

The BZX384C75-HE3-18 is characterized by its reverse breakdown voltage, or Zener Voltage of 7.5 volts, which helps protect the circuit from high voltage transients. The device is capable of handling a maximum forward current of 500 mA, with a typical dynamic impedance of 5.2 ohms. It is designed to withstand transients of up to 8A for 10 ms, with an operating temperature of -40°C to 85°C.

Conclusion

The BZX384C75-HE3-18 is a single, compact diode that enables simple circuit protection against over-voltage transients. It is primarily used as an over-voltage protection device, and can also act as a surge arrester to clamp voltage sources at their lower thresholds. The working principle of the diode is based on the reverse current blocking principle, allowing the voltage sources to be clamped at 7.5 volts. This device provides an ideal solution for protecting sensitive components from potential damage without adding bulk to a circuit.

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