SML4747-E3/5A

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The SML4747-E3/5A is a single zener diode, typically used in power supply, voltage regulation and shunt regulation applications.It is designed to limit a maximum voltage to a device, providing full-wave electrostatic discharge (ESD) protection and static voltage regulation.The SML4747-E3/5A is designed to block any voltage exceeding its breakdown voltage and clamp it at a certain level. It is capable of withstanding large reverse and transient ESD spikes and features a low forward voltage drop, allowing for low power loss.

Application

The most common application of SML4747-E3/5A is voltage regulation. It is used to stabilise a supply voltage to a system, such as reducing noise and preventing large voltage changes. In a power supply system, the SML4747-E3/5A is connected in series with the input source voltage and the output load. The diode ensures that the load receives a stable supply voltage at all times.In addition, SML4747-E3/5A is commonly used in shunt regulation circuits. It is connected in parallel with the load, with the anode of the diode connected to a fixed reference voltage, and the cathode connected to the load. It is designed to regulate the voltage by diverting any excess current away the load, thus protecting the load from overvoltage.

Working Principle

The principle of operation of the SML4747-E3/5A diode is based on the doping (implantation) of the diode with different types of impurities. These impurities form a p-n junction, which acts as a rectifying current flow when the p-n junction is exposed to a voltage. When the voltage on the junction reaches the breakdown voltage (zener voltage), the current begins to flow in the reverse direction, up to the maximum rated current. In a power supply system, the SML4747-E3/5A diode allows the passage of current in one direction only, and limits the maximum voltage to the breakdown voltage. This limitation prevents damage to the load due to high voltage, while still allowing the supply voltage to remain stable.In shunt regulation, the diode acts as a current limiter. When the current through the load exceeds the breakdown voltage, the diode becomes forward-biased and begins to transfer excess current away from the load, thus limiting the voltage on the load.

Conclusion

The SML4747-E3/5A is a single zener diode, typically used in voltage regulation and shunt regulation applications. It is designed to limit the maximum voltage to a device, providing full-wave electrostatic discharge (ESD) protection and static voltage regulation. The principle of operation is based on the doping of the diode with different types of impurities, forming a p-n junction and allowing for current flow in one direction only. In power supply systems, the diode is used to stabilise a supply voltage to a system, such as reducing noise and preventing large voltage changes. In shunt regulation, the diode acts as a current limiter and diverts any excess current away from the load, thus protecting the load from overvoltage.

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