BZX79-B5V1,143

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The BZX79-B5V1,143 is a diode in the Zener-Single family. It is used as a voltage regulator to protect sensitive integrated circuits (ICs) from overvoltage and to control circuit conduction and current flow in applications requiring a fixed reverse breakdown voltage. Its power rating is 200mW, and its operating temperature range is between -55°C and 50°C.

A Zener diode is a specialised diode designed to maintain a fixed voltage and to withstand the reverse current when the voltage is exceeded. When a conventional diode is taken out of its reverse-bias state, it experiences an avalanche breakdown and will conduct current. In contrast, a Zener diode will maintain a constant reverse-biased voltage even when the applied voltage is increased well beyond its breakdown voltage. This makes them ideal for voltage regulation applications.

The BZX79-B5V1,143 has a breakdown voltage of 5V and is a low-power device. It is composed of an N-doped and P-doped semiconductor material, creating a junction between the two materials. When reverse biased, the junction experiences an electric field that is strong enough to overcome the opposing fields of the electrons and holes, resulting in the movement of charge carriers across the junction. This pulse of current creates a reverse-bias voltage drop across the junction, which is known as a Zener effect.

In its most common operation, the BZX79-B5V1,143 is placed in parallel with a resistor and connected to a power supply. When the voltage applied to the diode exceeds its breakdown voltage, the diode begins to conduct and regulates the voltage across the diode to its breakdown voltage, thus limiting the current flow. This technique is commonly used in power supplies to protect sensitive electronic components from voltage spikes.

The BZX79-B5V1,143 can also be used in applications to control current flow by placing it in series with a resistor and a power supply. When a voltage is applied to a diode, it will conduct once the voltage exceeds its forward-bias voltage. The BZX79-B5V1,143 has a fixed forward-bias voltage that allows for precise control of current flow. This technique is commonly used in applications such as LED lighting, power supplies, and audio amplifiers that require precise current regulation.

The BZX79-B5V1,143 is capable of withstanding a maximum peak current of 200mA and is designed for steady-state overvoltage protection up to 6V. Its total capacitance is 5pF, and its power dissipation is 200mW. The diode is mechanically robust and well-suited for high-reliability applications.

In summary, the BZX79-B5V1,143 is a general-purpose low-power Zener diode primarily used in voltage regulation and current control applications. Its breakdown voltage of 5V allows precise regulation of voltage in power supplies and current in systems requiring low-power control. It is ideal for use in a variety of applications including those requiring high reliability protection, precise current control and high temperature operation.

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