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Diodes - Zener - Single

The TZMC27-M-18 is a Zener diode with a high breakdown voltage which can handle large amount of direct current. It is specifically designed for use in digital systems and power devices. It is also suitable for other applications like voltage and current regulation or termination of voltage or current sources.

Application Field

TZMC27-M-18 is used in a variety of diverse applications like in digital systems, power supplies, voltage and current regulation, termination of voltage/current sources, switching modules, and as a polarity protection device. It has high-power handling capability and wide storage temperature. These features make the Zener diodes highly suitable for different types of electrical systems.

Applications of TZMC27-M-18 Zener Diode include:

• Digital Systems: TZMC27-M-18 Zener diode is used for over-voltage protection and AC/DC input rectification.
• Power Devices: It is used for reverse voltage protection, over-voltage protection, and voltage regulation.
• Voltage Regulators/Terminating Element: TZMC27-M-18 is used as a switching element to regulate or terminate voltage and current pulses.
• AC/DC Converters: Zener diodes are used for three-way switching of AC/DC converts.
• Switching Module: It is used as an active element for switching between automatic/manual and AC/DC input.
• Polarity Protection: TZMC27-M-18 can be used as a polarity protection device to prevent a reverse voltage.

Working Principle

TZMC27-M-18 Zener diode is based on a double diffusion junction structure and uses the effect of avalanche breakdown. It works on the principle of Zener effect, which states that during the reverse-biased operation, the applied voltage should be much higher than the reverse breakdown voltage to increase the current flow in a diode. When the applied voltage reaches the avalanche breakdown voltage, the current suddenly increases, resulting in the breakdown of the diode. This phenomenon is known as the Zener effect.

TZMC27-M-18 Zener diode mainly operates in reverse bias condition and it contains a heavily doped p-n junction. The current flowing through this diode is actually a combination of avalanche current and minority carriers. When the avalanche breakdown voltage of the diode is reached, the avalanche current starts flowing which rapidly increases the reverse current and voltage breakdown occurs. This breakdown of the diode is also called Zener breakdown.

In this breakdown state, the reverse voltage across the diode is constant and independent of current. This is due to the fact that Zener diodes contain a large number of charges and therefore the generated space charge acts to stabilize the junction voltage at a constant value. The breakdown voltage of the diode is determined by the depletion region formed by the p-n junction junction.

Conclusion

TZMC27-M-18 Zener Diode is widely used in digital systems, power devices, voltage and current regulation, switching modules, and as a polarity protection device. It is based on the Zener effect which states that the applied voltage should be much higher than the reverse breakdown voltage to increase the current flow in a diode. When the applied voltage reaches the avalanche breakdown voltage, the current suddenly increases, resulting in the breakdown of the diode. The breakdown voltage of the diode is determined by the depletion region formed by the p-n junction junction.

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