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Diodes - Zener - Single: ACZRW5256B-G application field and working principle

ACZRW5256B-G

ACZRW5256B-G is a Zener single diode produced by ACST. The maximum reverse voltage is 25V and the maximum forward voltage is 1V with a 200mA current. The Zener voltage range is 5.1V~6.8V and the maximum temperature coefficient of the Zener voltage is 0.02%/°C. The total capacitance of the diode is 7.8pF. This diode has a low maximum reverse current and high surge current capabilities, making it suitable for a variety of applications, from current-limiting to bypass protection.

Application Field

ACZRW5256B-G is widely used in many applications, including power supplies, AC-DC converters, LED lighting and automotive electronics. It can be used as a current limiter, a current regulator, a voltage regulator and a bypass diode. It is also suitable for applications where low power dissipation, high stability and low noise operation are required.

Working Principle

The primary functioning principle behind the ACZRW5256B-G is the Zener Effect. This occurs when the voltage across the diode exceeds a certain value (called the Zener Voltage or Vz), the current passing through the diode increases exponentially. This reverse bias applied to the diode makes it behave like a limiter on the voltage.

The Zener voltage is determined by the characteristics of the semiconductor material and can be engineered to be very stable across varying temperatures. This stability makes the ACZRW5256B-G very attractive for applications that require a consistent supply of power.

In a typical circuit, ACZRW5256B-G is placed across a source of voltage, such as a battery or VR (voltage regulator). The Zener voltage of the diode regulates the voltage across the load, ensuring that the current does not exceed a certain level. If a high enough current is applied, then the diode will transition to its breakdown or avalanche state and the voltage across the diode will remain constant, regardless of the polarity and magnitude of the input voltage.

The ACZRW5256B-G is also used as a bypass diode, as it allows current to flow in both directions. This can be beneficial in applications where the input voltage may sporadically reverse, such as in AC-DC converters. The diode can also be used to protect sensitive electronics from high voltage spikes by clamping the voltage to a certain level. This can be very useful in automotive electronics, where voltage surges on the electrical system can cause serious damage.

Conclusion

In summary, the ACZRW5256B-G single diode is an extremely versatile component due to its ability to regulate voltage, current and prevent catastrophic damage from voltage spikes. Its ability to operate reliably in a large temperature range also makes it suitable for many applications, from industrial to automotive.

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