Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	4.81V
Tolerance:	±3%
Power - Max:	500mW
Impedance (Max) (Zzt):	130 Ohms
Current - Reverse Leakage @ Vr:	10µA @ 1V
Voltage - Forward (Vf) (Max) @ If:	900mV @ 10mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SC-90, SOD-323F
Supplier Device Package:	SOD-323F
Base Part Number:	DDZ4V7

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Diodes - Zener - Single

DDZ4V7CSF-7 Application Field and Working Principle

A Zener diode is a type of diode whichin particular is specifically designed tobe a voltage regulator. This type ofdiode is often used in a number of circuits and it’s main purpose is to allow the user to be able to monitor, control and maintain the output voltage that they are looking for. It’s highly sought after due to its ability to regulate current that passes through it and govern the voltage that passes through it. The specific type of diode we are focusing on here is the DDZ4V7CSF-7 and its different application fields as well as its working principle.The DDZ4V7CSF-7 diodes are mainly used for low power surface mount applications due to their small size as well as their large breakdown voltage capabilities. These diodes have a maximum power dissipation of 350 mW, total capacitance of 1.8 pF and a dynamic resistance of 0.36 ohms. In terms of their application, these Zener diodes are mainly used for EMI/RFI noise suppression, signal protection, reverse battery protection, regulated voltage source and voltage reference source.Working PrincipleThe working principle of these types of diodes mainly depends on the type of application they are used for. However, generally speaking, the principle is based around the creation of a voltage drop that then allows regulation of the resulting current. The DDZ4V7CSF-7 diode is a high density diode type with rapid reverse recovery time. This allows for quick rectification time of the alternating current allowing it to efficiently dissipate energy from the circuit.Under normal operating conditions, the diodes act as an open circuit, allowing for no current to passes through. Upon the introduction of a higher voltage source than its rated forward voltage, a small amount of current will then be allowed to travel through it. When it reaches a certain point, the amount of current that is allowed to pass though the diode is regulated and the resulting voltage will remain balanced at the rated voltage of the diode.The typical reverse voltage of such diodes is in the range of 4.7 volts. It is also repeatable and stable so current control of the diode is easily achievable. Upon the removal of a higher voltage source, the breakdown value of the diode then becomes its operating value. During a period of conduction, the resistance of the diode is extremely low which leads to a large amount of current being able to pass through.ConclusionThe DDZ4V7CSF-7 is a type of Zener diode that is designed for low power surface mount applications. It has a high breakdown voltage and is used for a number of different applications such as EMI/RFI noise suppression, signal protection, reverse battery protection, regulated voltage source and voltage reference source. The working principle of such diodes depends on the application and sets up a voltage drop that then allows regulation of the resulting current. The breakdown value of the diode then becomes its operating value and during conduction the resistance of the diode is extremely low.

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