SZMMSZ4694T3G

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Diodes are common components used in electronics. They are selected to control or modify the flow of electrical current within a pre-defined range and with a specific circuit. Among the vast variety of diodes, Zener diode is one of the most used in different types of applications. These diodes, unlike the conventional rectifying diodes, are used to regulate the voltages and even allow the current to flow in both directions.

A Zener diode is a heavily doped semiconductor with a reverse breakdown voltage that is engineered to a specific value. When the Zener diode is connected in a circuit in the reverse bias direction, it limits the voltage across it to a value near to its predetermined breakdown voltage. Thus a Zener diode operating in this manner regulates the output voltage and protects the electronic device from any excess of current or voltage. This type of diode is commonly represented by the symbol SZMMSZ4694T3G.

Application Field of SZMMSZ4694T3G

The wide application field of the SZMMSZ4694T3G is due to the many advantages that come associated with the use of Zener diodes. It can be used in the design of power supplies, voltage references and many other different types of circuitry. SZMMSZ4694T3G finds its application in various types of analog and digital circuits, and its breakdown voltage can be tailored to its particular application. Common applications of SZMMSZ4694T3G are:

• Stabilizing Supply Voltage: SZMMSZ4694T3G can be used as a voltage regulator device. This type of Zener diode allows the current to run through it, and is placed between the voltage source and the load. Thus, the voltage can be stabilized into a certain value and the load will be protected from excessive voltages.
• IC Protection: It is a known fact that ICs are extremely sensitive to static electricity and voltage fluctuations. Therefore, a series of Zener diodes are connected to the power supply and the pins of the IC to limit the voltage transients and protect the chip from voltage surges.
• Regulating Pulse: A group of SZMMSZ4694T3G can be used to form a voltage regulator that can be used to regulate the voltage pulsing in an application.
• Isolation of Voltage Reference: In an application, there exist cases when Zener diodes are used to isolate the reference voltage reading from the circuit. The Zener diodes are coupled back to back and act as a voltage divider making isolation possible.

Working Principle of SZMMSZ4694T3G

A Zener diode is a two terminal P-N junction diode with a heavily doped N-type semiconductor and a lightly doped P-type semiconductor. As stated earlier, Zener diodes are connected in reverse bias direction. When the voltage applied across the Zener diode is less than the breakdown voltage the device operates just like any other P-N junction diode and it won’t permit any current through it, thereby making it an open circuit. But when the applied voltage is greater than the breakdown voltage, the diode breaks down and the voltage across it is limited near the breakdown voltage VZ.

The operation of the SZMMSZ4694T3G as a voltage regulator device can be understood through the characteristics graph. The Zener resistance (Rz) is inverse to the breakdown voltage VZ. In series with the Zener diode, a current limiting resistor, RL, can be connected which regulates the current through the Zener diode.

When the voltage between the two terminals reduces below the reverse breakdown voltage VZ, the diode does not permit any significant current through it. But when the reverse bias voltage increases, the diode breaks down and reverse current starts to flow through it. The output voltage of SZMMSZ4694T3G is nearly fixed at the reverse breakdown voltage of the diode.

At breakdown, the current increases and the high resistance region of the P-N junction shrinks. As the current increases further, the resistance of the load resistor RL decreases and saturates. The saturation voltage of the load is nearly the same as the operating voltage VZ of the Zener diode. The voltage supply VCC must be slightly higher than VZ, so that the Zener diode can regulate the voltage.

This operation of the SZMMSZ4694T3G is superior to that of other types of voltage regulators in terms of efficiency, affordability and speed. This diode makes it possible to easily configure a voltage regulator circuit that can be used for a variety of applications.

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