UZ5840

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The UZ5840 is a single Zener diode, meaning it has two pins and has a single junction between them. It is a 3-terminal device, with a cathode, anode and external connection. UZ5840 is used in linear voltage regulation and is designed for positive and negative voltage. It is commonly used in applications such as voltage reference monitoring, analog precision alignment and digital signal conditioning.

Principle of Operation

UZ5840 works on the principle of the Zener effect, i.e., the tunnel diode operation. Under a forward bias, electrons form the anode move through the PN junction and fills up the N-type region, creating a depletion region. Step voltage appears once the depletion region width becomes zero. This is called the Zener breakdown and it results in an increase of current.

When the external reverse bias is applied, the electrons are pushed back, creating negative voltage drop and the current through the diode decreases. The external resistance of the diode is the controlling factor for the Zener voltage. The Zener voltage is selected by choosing the external resistance. As the current increases, the voltage will remain constant and the tolerance of the diode will be very low.

Application of UZ5840

The UZ5840 is designed for a wide range of applications such as power supply regulation and protection, voltage regulation and precision alignment, as well as digital signal conditioning. It is typically used in linear regulation where the voltage is linearly converted from AC to DC. This diode can also be used in noise sources, oscillators and frequency dividers. UZ5840 is also used in voltage reference applications, such as over-voltage or under-voltage protection, voltage divider, operational amplifiers and rectifier circuits.

UV Monitoring applications can also use UZ5840 to detect UV radiation and thereby indicate whether sunlight is high enough to generate power. UZ5840 can also be used in other temperature measurements, as it is a good temperature sensor.

The UZ5840 is suiable for use in varying temperatures such as -25°C to +85°C, and is available in a low-profile TO-252-5 package. It has an isolation voltage of 500V and an absolute maximum reverse bias current of 5mA. It is designed for operation with a pulse current of 8mA and has a power dissipation of 200mW. The maximum reverse voltage of UZ5840 is 58V.

Conclusion

The UZ5840 single Zener diode is a versatile, low-profile and high-performance device suited for a wide range of applications. It works on the principle of Zener breakdown and is designed for positive and negative voltage applications such as voltage reference monitoring, analog precision alignment and digital signal conditioning. The UZ5840 has a wide temperature range and is available in a low profile TO-252-5 package. It has a maximum reverse bias current of 5mA and absolute maximum reverse voltage of 58V. This device is a good choice for UV monitoring, temperature measuring and voltage regulation applications.

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