CDLL4117

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	25V
Tolerance:	±5%
Power - Max:	500mW
Impedance (Max) (Zzt):	150 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 19V
Voltage - Forward (Vf) (Max) @ If:	1.1V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Surface Mount
Package / Case:	DO-213AB, MELF
Supplier Device Package:	DO-213AB

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CDLL4117 Application Field and Working Principle

CDLL4117 is a common type of diode special structure in single Zener diodes. It is a power device used to control the voltage source in the circuit. It is designed to have a stable limit voltage that does not vary with the current. It operates in the reverse conduction region and is a two junction device, one normal p-n junction and the other is a connection between an intrinsic layer and the p layer.

Application Field

Due to its unique characteristics, CDLL4117 is widely used in many fields, including power supply circuits, power factor controllers, DC-DC converters, motor drive circuits, frequency converters, and LED displays. It can be used as low-voltage positive and negative voltage regulator, input voltage protection, voltage clamp, and control of the switching TTL circuit. It also can be used in various automatic control circuit, microcomputer and logic controller interface circuit and field of electronic equipment.

Working Principle

When the reverse voltage across the Zener diode CDLL4117 rises, the current through the diode increases until the Zener voltage is reached. After the Zener voltage is reached, the Zener diode has the characteristic that the voltage across the diode remains constant. When the value of the applied voltage is above the voltage reference, the CDLL4117 will maintain a constant voltage within an operating range. When the applied voltage drops, the reverse current falls off as the voltage approaches zero. The CDLL4117 will be off when the reverse current is off but the protection is still there. If the reverse current rises, the CDLL4117 will be back on instantly. Therefore, the purpose of the Zener diode CDLL4117 is to regulate the voltage output.

Protection Performance

CDLL4117 Zener diodes can provide input and output over-voltage protection. It can be used as a reverse clamp to protect circuit components such as transistors, ICs, and sensitive parts. When the protection circuit is damaged by an excess reverse current, CDLL4117 can provide reverse leakage current to ensure continuity of the circuit. When the over-current is too large and the voltage is too low, CDLL4117 can help to limit the current dissipation and thereby protect the circuit from damage.

Conclusion

CDLL4117 is a single Zener diode designed for application in many fields such as power supply circuits, DC-DC converters, frequency converters, and LED displays. It is a two junction device, one normal p-n junction and the other is a connection between an intrinsic layer and the p layer. It is ideal for protecting circuit components, providing input and output over-voltage protection, and limiting the current dissipation. With these properties, CDLL4117 is an essential device in many modern electronic equipment and is sure to serve an important role in the coming years.

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