1N2821A

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	25V
Tolerance:	±10%
Power - Max:	50W
Impedance (Max) (Zzt):	2.7 Ohms
Current - Reverse Leakage @ Vr:	10µA @ 19V
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:	1N2821

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1N2821A Application Field and Working Principle

Introduction to 1N2821A

1N2821A is a Zener diode with low reverse leakage, standoff voltage of 5.6 volts and power rating of 1/4 watt. It is a single diode component with a power dissipation of 200 milliwatts.

Application Field of 1N2821A

1N2821A has a wide range of applications in electronics. It can be used in voltage regulation, voltage multiplier circuits and load regulation. It can also be used as a current regulator in a wide range of devices, such as digital circuits, analog circuits and even to stabilize power in supplies.The 1N2821A can also be used as a feedback element in pulse width modulation (PWM) systems and switching circuits. It acts as a switch, allowing a current to flow through the circuit when the voltage is above the breakdown voltage. This has numerous applications, such as providing current regulation, controlling the pulse width of an integrated circuit and providing overvoltage protection.The 1N2821A can also be used in voltage division circuits. By connecting the diode in series with a resistor, a voltage division can be formed that can be used to supply either Vcc or ground voltage for various components.

Working Principle of 1N2821A

The 1N2821A is a Zener diode and functions by having a breakdown voltage above which, the current through the diode starts to increase exponentially. This breakdown voltage is known as the Zener voltage and determines the voltage regulation of the diode.When a voltage is applied to the diode, a very small amount of current flows through the diode in the forward direction. When the voltage reaches the Zener voltage, the current starts to increase exponentially due to the avalanche breakdown of the junction. As the current increases, the voltage across the diode also increases until it reaches the Zener voltage. When the voltage across the diode reaches the Zener voltage, the current through the diode is limited by the external circuit and this current is also referred to as the Zener current. The Zener current is the current that flows through the diode when the voltage across the diode is at the breakdown voltage and provides the regulation of the voltage.

Conclusion

The 1N2821A is a high power Zener diode that has a wide range of applications and can be used in various applications such as voltage regulation, voltage multipliers, PWM systems, switching circuits, feedback elements and voltage division circuits. It functions by having a breakdown voltage above which, the current through the diode increases exponentially and is regulated by an external circuit, referred to as the Zener current.

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