BZX79C7V5

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Diodes - Zener - Single

The BZX79C7V5 is a single Zener diode from a group of diodes by Vishay Semiconductor used for a broad range of applications.

Application Field

With its 500mW power dissipation and its 5.1V breakdown voltage, this diode is commonly used for the regulation of currents and the clamping of voltages in circuits where a low reverse voltage is required. Some of these applications include pulse- or signal-clamping circuits, input overvoltage protection, lighting control and consumer electronics.

Working Principle

The BZX79C7V5 is a Zener diode, meaning that it will function differently compared to the standard P-N junction diode when it is connected to a voltage source. When connected to a battery or other voltage supply and forward-biased, current will flow through the diode based upon the voltage applied. If the applied voltage exceeds the Zener breakdown voltage, then the diode will enter Zener breakdown operation and the voltage across the diode will remain essentially constant regardless of further increases in the applied voltage. The diode thus acts as a voltage regulator, producing an exactly regulated output voltage, with a small decrease in power supply voltage being offset by a corresponding increase in current.

The voltage regulation achieved by a Zener diode is very efficient, with a maximum difference of 5.1V between input and output voltages for the BZX79C7V5. This means that the diode can be used to regulate a voltage significantly higher than its breakdown voltage, making it more efficient compared to P-N junction diodes and a preferred choice for many types of applications.

Additionally, the BZX79C7V5 has a low reverse current leakage, meaning that very little current is drawn when no voltage is applied, making it a good choice for input protection as well as for low power and lightweight circuits.

Conclusion

The BZX79C7V5 Zener diode is an energy-efficient, low-cost component used for a wide variety of applications, from signal-clamping to lighting control. Its 500mW power dissipation and 5.1V breakdown voltage make it useful for creating tightly regulated voltage outputs and low power circuits. Its low reverse current leakage also makes it a good choice for input overvoltage protection.

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