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Diodes - Zener - Single

BZX79C11-T50A application field and working principle

BZX79C11-T50A is a general purpose Zener diode with good pulsed power capabilities. It has low zener voltage (5.1V) and low zener impedance, making it suitable for various applications including voltage clamping, over-voltage protection and signal switching.

BZX79C11-T50A is a two terminal device that can handle currents up to 500mA. It is usually packaged in a SOT-23 form factor. It has a maximum operating temperature of -65°C to +150°C.

The working principle of BZX79C11-T50A is based on the behavior of a diode in forward bias, which is the formation of a depletion region due to the junction between n-type and p-type materials. This region allows electrons to flow from the n-type to the p-type material, creating a voltage drop (also known as barrier potential) between the two sides. When the voltage drop across the diode is equal to its zener voltage, then it is referred to as the zener breakdown voltage.

In order to limit the voltage across the diode, the supply voltage should be less than the zener breakdown voltage. When the supply voltage is higher, the BZX79C11-T50A diode automatically limits the voltage across it and reduces it to a safe level. This protects the circuit from voltage variations or spikes caused by external sources.

BZX79C11-T50A can be used for various applications such as for voltage regulation, voltage clamping, over-voltage protection, and signal switching. It can also be used as a voltage regulator to provide reliable voltage in different types of power supply circuits. For example, if the input voltage is greater than the output voltage of the power supply, then the excess voltage can be clamped using the BZX79C11-T50A diode, preventing the circuit from damage caused by excessive voltages.

BZX79C11-T50A is also used in protection circuits that are designed to protect sensitive equipment from over-voltage transients or surges. These over-voltage protection circuits usually consist of a Zener diode, a nonlinear component such as a transistor, and a current limiting resistor, all connected in series. When an over-voltage transient appears on the circuit, the diode begins to clamp the voltage and dissipate it across the series components, thus protecting the circuit from any damage.

In summary, BZX79C11-T50A is a versatile Zener diode with good pulsed power capabilities and low zener voltage, making it suitable for an array of applications such as voltage regulation, voltage clamping, over-voltage protection, and signal switching.

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