1N2809A

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	11V
Tolerance:	±10%
Power - Max:	50W
Impedance (Max) (Zzt):	0.8 Ohms
Current - Reverse Leakage @ Vr:	10µA @ 8.4V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 10A
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Through Hole
Package / Case:	TO-204AD
Supplier Device Package:	TO-204AD (TO-3)
Base Part Number:	1N2809

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Introduction

1N2809A is a Zener diode, which is a specialized type of diode used for voltage regulation. It is a single-terminal electronic component with two terminals, an anode and a cathode. The zener diode has a reverse bias which means that the anode is at a higher potential than the cathode. The voltage drop across the diode is determined by a built-in reverse bias. In order to work properly, the diode must be forward biased. When the voltage across the diode is greater than the breakdown voltage it will begin to conduct current.The 1N2809A is designed to provide a consistently regulated output voltage by drawing a current directly proportional to the amount of voltage that needs to be regulated. This is possible due to the fact that the breakdown voltage is held constant. This provides a stable output voltage that does not drift or vary over time or from device to device.

Application Field

The 1N2809A is commonly used in many applications such as linear voltage regulators, voltage references, voltage clamps, surge limiters, power supply circuits, and reverse battery protection. It is also used as a temperature sensor and noise source.The 1N2809A is well suited for regulating the voltage output of adjustable power supplies and current sources. It can also be used in audio amplifiers, voltage followers, driver circuits and other power conditioning circuits.

Working Principle

The working principle of 1N2809A is based on a reverse-biased diode. In its reverse bias, electric current cannot flow from cathode to anode. But if the connected voltage is higher than the breakdown voltage of the diode, an avalanche current break through the junction and conduct current. This breakdown voltage is fixed for all the 1N2809A Zener Diodes and slightly varies within the specified range.The 1N2809A derives its functioning from the fact that when reverse biased, it can be turned on with a specified breakdown voltage. The breakdown voltage of 1N2809A is 5.1V, which is slightly varies in its specified range. This voltage is held constant and does not vary over time and from device to device. When the anode of the diode is at a higher potential than the cathode, current will flow through the diode and the voltage drop across it is kept constant. As the current increases, the voltage across the diode decreases, which effectively regulates the output voltage. This is the principle behind the 1N2809A\'s ability to provide a consistently regulated output voltage.

Conclusion

1N2809A is a Zener diode that is commonly used for voltage regulation applications. Its working principle is based on reverse bias which allows current to conduct once the voltage exceeds the breakdown voltage. It is used in many applications such as linear voltage regulators and power supply circuits as it provides a stable, consistently regulated output voltage.

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