Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Voltage - Zener (Nom) (Vz):	3.9V
Tolerance:	±5%
Power - Max:	1W
Impedance (Max) (Zzt):	9 Ohms
Current - Reverse Leakage @ Vr:	50µA @ 1V
Operating Temperature:	150°C
Mounting Type:	Surface Mount
Package / Case:	DO-214AC, SMA
Supplier Device Package:	DO-214AC (SMA)

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SML4730A-E3/5A Application Field and Working Principle

Introduction

SML4730A-E3/5A is a Zener diode manufactured by SEMtech. It is commonly used in various electronic devices and is a single diode with a maximum reverse voltage of 3.7V and a breakdown voltage of 5V. This diode is used as a voltage regulator and has a variety of different applications and a corresponding working principle.

Application Field

SML4730A-E3/5A primarily serves as a voltage regulator. Because it is a Zener diode, it functions by allowing current flow in a particular direction while limiting it flowing in the opposite direction. Such a diode is commonly used to regulate voltages used in circuit boards and other forms of circuitry.In a nutshell, when its reverse voltage exceeds 5V, the diode will act as a regular diode by allowing a current to flow in reverse direction. Once it passes 5V, the resistance decreases and reduces its forward voltage drop. This ensures that the reverse voltage remains constant and steady.In addition to its use as a voltage regulator, this diode also finds use in the voltage detection circuits. It detects can quickly detect the voltage levels and is used in the detection of various voltage signals such as those from the digital circuits.

Working Principle

The working principle of the SML4730A-E3/5A diode is based on the aforementioned properties of a Zener diode, namely that it allows the current to flow in one direction but limits the current flowing in the opposite direction.At low voltages, the diode acts as an insulator, preventing any current from flowing. As the voltage increases, the diode allows current to flow in one direction, maintaining a constant reverse voltage. This ensures that the voltage is kept at a steady and constant level.However, as the voltage increases further, the diode\'s internal resistance decreases, reducing its forward voltage drop. This increase in forward voltage drop allows the current to pass through the diode and increase. This keeps the circuit from being damaged due to a sudden increase in voltage.

Conclusion

To conclude, the SML4730A-E3/5A is a Zener diode which serves mainly as a voltage regulator used in circuit boards and digital circuits. It works by allowing current to flow in one direction while preventing it from flowing in the opposite direction. As the voltage increases, the internal resistance of the diode decreases and its forward voltage drop also increases. This ensures that any sudden spikes in voltage are absorbed and not damaging to the circuit.

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