MMXZ5234B-TP Discrete Semiconductor Products

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MMXZ5234B-TP Application Field and Working Principle

The MMXZ5234B-TP device belongs to a family of single zener diodes, which are specially designed to provide stable zener clamping action. These diodes are designed to operate at a specified voltage amid a given range of operating temperature, while providing a specific zener current. These diodes can be found in a wide range of applications.

Features

The MMXZ5234B-TP is a single zener diode with the following characteristics:

• Voltage rating from 10 to 46 Volts;
• Zener Voltage (max) 12.0 Voltage;
• Zener Impedance (max)30 Kilo Ohms;
• Maximum Total Power Dissipation of 0.45 watts;
• Operating Temperature Range from -65°C to +150°C;
• Available in a SOT-323 Package;

Applications

The MMXZ5234B-TP can be used in a variety of applications, including overvoltage protection, reference voltage circuitry and biasing voltage circuitry. The diode is designed to perform optimally in all sorts of circuit designs and equipment that require a stable zener voltage.

The MMXZ5234B-TP can be used as a voltage regulator, to limit overvoltage damage, as a start-up regulator, or as a reference device. It can also act as a voltage source for load regulation, and as a motor speed controller. In addition, the diode can be used to clamp the output voltage of an over-voltage sense amplifier.

Working Principle

The MMXZ5234B-TP works on the principle of diode breakdown. At a specific reverse bias voltage, typically 0.7V, the diode drops its impedance from low to nearly infinite resistance. This allows current flow through the device, establishing a voltage reference. In other words, in order to maintain a particular reverse biased current, a specific amount of forward bias voltage is required.

Under a specific reverse bias voltage, the diode will begin to experience a decrease in current conduction. This phenomenon, known as the avalanche effect, produces a sharp drop in the forward voltage drop of the device, resulting in a nearly flat characteristic, also known as a knee.

The MMXZ5234B-TP device decreases in forward voltage drop from its normal state, which can be 0.7V and continue dropping until it reaches the knee in the region of 0.5V. This voltage, known as the zener voltage, is actually the zener rating of the device and the exact point at which reverse breakdown occurs – thus offering a specific reference voltage. This reference voltage can be held steady even in the presence of temperature variations or voltage spikes.

The MMXZ5234B-TP thus provides a robust measure of overvoltage protection, in addition to being able to act as a voltage regulator, reference device or motor speed controller, due to its ability to keep a stable zener voltage. The MMXZ5234B-TP is also rated for operation up to 150°C making it useful in a wide range of applications.

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