1N2978A

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	14V
Tolerance:	±5%
Power - Max:	10W
Impedance (Max) (Zzt):	3 Ohms
Current - Reverse Leakage @ Vr:	10µA @ 10.5V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 2A
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Chassis, Stud Mount
Package / Case:	DO-203AA, DO-4, Stud
Supplier Device Package:	DO-213AA
Base Part Number:	1N2978

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Introduction

1N2978A is a single Zener diode which belongs to the family of diodes and is used to provide electrical conduction in one direction while blocking conduction in the opposite direction. The diode is commonly used to maintain a constant voltage and protect sensitive electrical components from sudden spikes in voltage. The 1N2978A has a maximum reverse voltage of 12 volts and a power dissipation rating of 500 mW.

Applications

The 1N2978A Zener diode is primarily used for voltage regulation and overvoltage protection. The diode can be used in a wide range of applications, from general-purpose voltage regulation, to surge capacitor energy storage, to controlling the voltage in battery-powered devices. The diode also has applications in protection applications, such as protecting against overcurrent, electrostatic discharge, and other electrical transients. Additionally, the diode is used in the detection and control of power circuits, the regulation of voltage for circuit protection, and the control of signal inputs or outputs.

Working Principle

The 1N2978A Zener diode is an electronic component with both N-type and P-type semiconductor materials connected in a single device. When the diode is facing in the forward direction, electrons and holes travel through it and current flows as expected. However, when the diode is reversely biased, the voltage applied across it causes a breakdown of the P-N junction. This breakdown allows current to flow in the reverse direction, creating a low-resistance path with a constant voltage drop. This constant voltage drop is referred to as the Zener voltage, and all Zener diodes have a specific Zener voltage associated with them. As the Zener voltage is applied to the 1N2978A, the voltage remains constant, preventing damage from voltage spikes or surges.

Conclusion

The 1N2978A Zener diode is a valuable component for voltage regulation and overvoltage protection in a wide range of applications. Its N-type and P-type semiconductor construction allows for the breakdown of the P-N junction, creating a low-resistance path with a constant voltage drop. This constant voltage drop is referred to as the Zener voltage, and it is critical for protecting electrical components from damaging voltage spikes or surges. The 1N2978A has a maximum reverse voltage of 12 volts and a power dissipation rating of 500 mW, making it a reliable and sturdy component for providing both electrical conduction and protection.

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