1N5377/TR12

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Voltage - Zener (Nom) (Vz):	91V
Tolerance:	±20%
Power - Max:	5W
Impedance (Max) (Zzt):	75 Ohms
Current - Reverse Leakage @ Vr:	500nA @ 65.5V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 1A
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Through Hole
Package / Case:	T-18, Axial
Supplier Device Package:	T-18
Base Part Number:	1N5377

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1N5377/TR12: Application Field and Working Principle

Classification: Diodes – Zener – Single

The 1N5377/TR12 is a Zener diode, which has become a ubiquitous component in electronics manufacturing due to its wide range of applications. This device, belonging to the group of single diodes, is designed to provide a constant current, even when the voltage applied to it varies. Before understanding how it works, let’s explore the major areas of its application.

Applications

1N5377/TR12 is most commonly used as a voltage regulator. It works as a voltage control device, actively monitoring the voltage and adjusting it accordingly. This ensures that the output voltage delivered is kept within the specified limits – an essential requirement in maintaining the reliable performance of electronic devices. This Zener diode is also employed as a voltage reference, used to provide a constant unvarying level of the output voltage. This system maintains the stability of the entire device and helps to protect it from power fluctuations caused by a temporary increase or decrease of the input voltage. The 1N5377/TR12 is also used in mains power supply applications. Owing to its excellent current capability and low thermal resistance, this Zener diode is ideal for regulating the output voltage from the secondary of the transformer.

Working Principle

The 1N5377/TR12 is a standard Zener diode, designed to favor the electron movement in one specific direction. It works on the principle that a conventional diode becomes a highly resistive device when directly connected to the power source, not allowing the current to flow in the reverse direction.The 1N5377/TR12, however, has an additional feature in the form of a specially designed "Zener junction". When a voltage exceeding the breakdown voltage is applied to the device, the Zener junction breaks down, resulting in the passage of the current, even though the diode is connected to the power source in the reverse direction. The device allows the current to flow in both directions, although the amount of current in the reverse direction is much lesser, due to the voltage breakdown feature of the Zener junction. This helps in maintaining the output voltage at a constant level, or adjusting it accordingly depending on the load or power fluctuations.

Conclusion

The 1N5377/TR12, a Zener diode, is a versatile component employed in a wide variety of applications. The device is designed to work on the principle of a traditional diode along with an additional feature – the Zener junction – which allows a steady flow of current when a voltage exceeding the breakdown voltage is applied to the device. This feature helps in regulating or maintaining the output voltage, a requisite for reliable operation of the electronic devices.

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