BZX79C33

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BZX79C33 Application Field and Working Principle

The BZX79C33 is a SOD-8 packaged, single Zener diode, specifically designed as a voltage reference. It provides excellent temperature coefficient, low leakage current and surges up to five watts of power dissipation. It offers a standard zener voltage of 5.6V and operating temperature range spanning -55ºC to 150ºC.

Application Fields

The BZX79C33 is popular in the following application fields, among others:

• Electronic circuits for measuring and control technologies
• High-powered audio and video amplifiers
• Battery chargers
• Resistor networks
• Battery switches
• Regulators
• Timing circuits
• Computer logic circuits
• Automotive applications
• 3.3V, 5V and 12V voltage monitoring

Working Principle

The diode was specifically designed for applications requiring an accurate reference voltage. The core principle of its working mechanism is the following:

• When a voltage beyond the Zener breakdown voltage is applied on the anode, the device will conduct.
• On the other hand, if the voltage between the anode and the cathode is below the Zener voltage, the device will have a reverse bias and turn off.

The reverse leakage current, or "Off-state" current is usually limited. As a result, the current through the device will adjust until the voltage across the terminals converges to the Zener breakdown voltage. In this manner, the BZX79C33 voltage reference delivers a constant, regulated voltage across the terminals.

Advantages of the BZX79C33

The main advantages of the BZX79C33 are its wide temperature range, low current leakage, and good electrical characteristics. Its unique design allows for reliable operation under extreme conditions. It is particularly suited for applications requiring very low on-state leakage.

The BZX79C33 also has a very fast reverse recovery time, which allows it to quickly switch from high to low current. This makes it ideal for high-end audio and video applications, as well as for communications systems that require fast switching times.

In short, the BZX79C33 is an excellent choice for applications requiring a very precise reference voltage. It is reliable, fast and has a wide operating temperature range. Additionally, it is small and requires little energy to operate.

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