CDLL4122

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	36V
Tolerance:	±5%
Power - Max:	500mW
Impedance (Max) (Zzt):	200 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 27.4V
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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CDLL4122 Application Field and Working Principle

CDLL4122 is a single Zener diode. It is used in many electronic applications that rely on the Zener behavior of a diode, such as voltage regulators, clippers and clampers, ESD protection, and even computer clock generators. CDLL4122 has a rated breakdown voltage of 4.1V, a maximum power dissipation of 191mW, and a maximum reverse current of 150uA.

Voltage Regulator Circuits

Voltage regulator circuits use the Zener diode to regulate the voltage when a load is applied to a power source. These circuits rely on the Zener behavior of the diode, where the voltage across the diode becomes constant when the voltage across the diode reaches the breakdown voltage BV. In the circuit, a resistor, R1, is connected in series with the diode to limit the current that flows through the diode when the voltage reaches the breakdown voltage.

Clippers and Clampers

Clipper and clapper circuits use the Zener diode to clip the input signal either positively or negatively. In a positive clipper, the Zener diode is reversed biased and a capacitor, C1, is placed in parallel with it. When the input signal exceeds the breakdown voltage of the diode, the capacitor is charged to the breakdown voltage and the output signal is clipped and remained at a constant level. The same process is applied in a negative clipper, except the Zener diode is forward biased and the capacitor is placed in series with it.

ESD Protection and Clock Generators

Electrostatic discharge (ESD) protection uses the Zener diode to protect other components from the sudden voltage spikes caused by ESD. The Zener diode is placed across the component to be protected and limits the voltage to the breakdown voltage. Clock generators use the Zener diode to create a stable timing signal. The Zener diode is placed in a circuit with an oscillator and a feedback capacitor, C1, and when the voltage reaches the breakdown voltage, the oscillator stops and the capacitor is discharged. The cycle then starts again and the output signal is a clock signal.

Working Principle

The working principle of the Zener diode can be understood by examining the diode’s characteristic curve. The Zener diode has a reverse voltage region, where the voltage across the diode increases, but the current through the diode remains constant. This is because of the narrow depletion layer that is present in the diode. Once the voltage reaches the breakdown voltage, the current suddenly increases and the voltage across the diode is clamped at the breakdown voltage. This is why it is called the Zener breakdown. This behavior of the Zener diode allows it to be used in many of the applications described above.

Conclusion

CDLL4122 is a single Zener diode that can be used in many applications ranging from voltage regulation to ESD protection and clock generators. The Zener behavior of the diode allows it to regulate the voltage and clip the input signals when the voltage reaches the breakdown voltage. This makes the CDLL4122 a very versatile diode, capable of handling many different applications.

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