1N5921BUR-1

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	6.8V
Tolerance:	±5%
Power - Max:	1.25W
Impedance (Max) (Zzt):	2.5 Ohms
Current - Reverse Leakage @ Vr:	5µA @ 5.2V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Surface Mount
Package / Case:	DO-213AB, MELF
Supplier Device Package:	DO-213AB
Base Part Number:	1N5921

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IntroductionThe 1N5921BUR-1 is a Zener diode from ON Semiconductor, an American-based company specializing in the design and manufacture of semiconductor components and related products. It belongs to a series of single diodes and is designed for general-purpose zener applications. This type of diode has a large number of uses, especially in the areas of electronics and engineering. Structure and CharacteristicsThe 1N5921BUR-1 is a 3-pin single diode, with a small package size of 2 mm x 1 mm. It has a Zener voltage of 5.1 V, a reverse breakdown voltage of 6.5 V, and a power dissipation of 250 mW. The maximum working current is 1 mA. The maximum power dissipation per package is 500 mW. It also has a low threshold voltage of 0.5 V. The 1N5921BUR-1 features an exceptional reverse surge current capability and a low reverse leakage. Its low Vz rating makes it suitable for use in applications such as tuning circuits and refrigerator repair. ApplicationsThe 1N5921BUR-1 is mainly used in electronic circuits as a Zener diode. It can be used in power supply design, to protect electrical circuits from voltage spikes and to help regulate the supply voltage in circuits with high current. It is also used for voltage regulation in AC circuits, as well as for providing reverse-polarity protection. The large capacitance of the 1N5921BUR-1 makes it an excellent choice for tuning circuits in amplifiers. It is also commonly used in refrigerator repair, where it is used to provide reverse-polarity protection in compressor circuits. Working PrincipleThe 1N5921BUR-1 is a Zener diode, which means that it has an intrinsic breakdown mechanism. When the reverse voltage across it exceeds a certain level (its Zener voltage) it begins to conduct in the reverse direction. This phenomenon is known as the Zener breakdown, and it is the main characteristic of a Zener diode. At a certain point, the voltage across the diode will begin to drop rapidly. This is known as the Zener knee voltage point. As the voltage drops, the current running through the diode will increase. This phenomenon is known as the Zener effect.This mechanism is utilized in the 1N5921BUR-1 for voltage regulation, as it will allow the current to be regulated precisely by controlling the voltage across it. ConclusionThe 1N5921BUR-1 is an excellent choice for general-purpose Zener applications and is mainly used in power supply design, voltage regulation, reverse-polarity protection, and tuning circuits. Its low Zener voltage and large capacitance make it an ideal choice for these applications. It is also known for its exceptional reverse surge capability and low reverse leakage.

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