CDLL983

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Diodes - Zener - Single

The CDLL983 is a single, 5 Watt Zener diode with nominal breakdown voltage of 23V and a power dissipation range between 1.5 and 5 Watts. This Zener diode is suitable for reliable voltage regulation; applications include use in precision voltage references for instrumentation and power supply design, as well as for clamping applications such as protection from inductive spikes.

The key features of the CDLL983 are its low forward voltage drop, low leakage current, and low temperature coefficient, which ensure reliable current regulation over a wide temperature range. For these reasons, the CDLL983 is often used in precision voltage reference circuits, which require a minimum of forward voltage drop, and for protecting sensitive circuits from voltage transients. The CDLL983 is also suitable for conditioning optical signals in optical communication systems.

Type and Structure of Zener Diode

The CDLL983 is a single 3-pin SOD-323 package Zener diode. Each diode contains a semiconductor bar inside a glass or silicone shell, which is connected to a pair of zinc chloride wires. The structure of the Zener diode is referred to as a PN-junction diode. In this type of configuration, electrons “move” across the PN-junction, changing their energy level and forming a depletion layer. This depletion layer blocks further current from passing through the diode.

Working Principle of Zener Diodes

Zener diodes are called “avalanche” diodes because of the way they work. Zener diodes operate in the reverse direction, meaning that electrons flow from the anode to the cathode. As the voltage across the diode increases, electrons are able to overcome the depletion layer and travel to the higher energy level of the diode’s semiconductor material. As more electrons move across the PN-junction, the depletion layer widens, allowing additional current to pass through the diode. This phenomenon is known as avalanche breakdown, and it is what gives Zener diodes their characteristic reverse avalanche effect.

When the voltage across the Zener diode reaches a certain threshold, the diode begins to conduct and the current flows in the reverse direction, allowing the Zener diode to regulate and stabilize a fixed voltage across itself. This regulation is then used to provide a reference voltage or stabilize voltage levels. As the voltage across the diode increases, the wider the depletion layer becomes, hence the diode is able to pass more current.

Applications of Zener Diodes

Zener diodes are widely used in many applications including voltage regulation, DC-DC power supplies, overvoltage protection and pulse shaping. By placing a Zener diode in a circuit, it acts as a voltage regulator, ensuring that the voltage never exceeds its breakdown voltage and thus preventing any overvoltage from damaging other components. In DC-DC power supplies, the Zener diode is used to create a stable output voltage. Another popular use of Zener diodes is pulse shaping. By placing a Zener diode in series with a capacitor, the capacitor will be charged until the Zener diode reaches its breakdown voltage, at which point the capacitor will discharge. This is referred to as a Zener diode drive circuit and is often used in logic circuit applications.

Conclusion

The CDLL983 is a single, 5 Watt Zener diode with a nominal breakdown voltage of 23V. It is suitable for a wide range of applications, including precision voltage references, protection from inductive transients, DC-DC power supplies and pulse shaping. It has a low forward voltage drop, low leakage current, and low temperature coefficient, which make it well suited for many applications.

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