1N821UR-1

Series:	--
Packaging:	Bulk
Part Status:	Discontinued at Digi-Key
Voltage - Zener (Nom) (Vz):	6.2V
Tolerance:	±5%
Power - Max:	500mW
Impedance (Max) (Zzt):	15 Ohms
Current - Reverse Leakage @ Vr:	2µA @ 3V
Operating Temperature:	-55°C ~ 175°C
Mounting Type:	Surface Mount
Package / Case:	DO-213AA (Glass)
Supplier Device Package:	DO-213AA

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The 1N821UR-1 diode, a single Zener diode, is a highly reliable, low voltage, high power, and relatively low-cost electrical device. It is widely used in various applications like voltage regulation, surge protection, and voltage equalization. A Zener diode is a special type of diode developed for regulating and stabilizing a voltage supply. It has two sections and can be identified by the "junction" that separates them. One section is a traditional diode, while the other is a zener diode. When a voltage differential is applied across the junction, a current flows through the zener. At the same time, a Zener diode can also be used for clamping or limiting voltages and currents as well as for voltage equalization and voltage regulation. The 1N821UR-1 diode, in particular, is capable of handling power up to 750 mW and has a reverse breakdown voltage range of 2.2 – 3.6V. Moreover, it features a maximum forward voltage drop of 0.1V at a forward current of 1A. The working principle of a Zener diode is pretty straightforward. When a reverse voltage is applied to the diode, a certain breakdown or "zener" voltage is reached. At this point, a large current flows through the diode. This current is caused by the electric field created around the diode. The break down voltage of the 1N821UR-1 diode is not always a constant value but is dependent upon the temperature. This is because the Zener voltage of a Zener diode is affected by temperature. As temperatures increase, the Zener voltage will lower, which is useful for temperature compensation purposes.The 1N821UR-1 Zener diode can be used for a variety of applications, such as voltage regulation and zener diode clamps, especially in consumer electronics such as laptop computers, mobile phones, and digital cameras. It is usually used as a part of a protection circuit, as it can suppress overvoltages and reduce the risk of voltage increases or drops. Besides consumer electronics, it can also be used in automotive, industrial and military applications. Additionally, 1N821UR-1 Zener diodes are used in voltage-sensing circuits, which monitor voltage levels in many different kinds of industrial devices. The circuit monitors the voltage levels to determine if it exceeds the preset levels, which can then be used to trigger an alarm. This is especially useful for devices that are operating at high voltages, as it prevents any power fluctuations from damaging sensitive components.Overall, the 1N821UR-1 diode is a reliable, low voltage, low cost, and high power electronics device that is used in many different applications. It is capable of handling up to 750mW of power, has a forward voltage drop of 0.1V at 1A, and its Zener voltage can be temperature-compensated. Thanks to its versatility, 1N821UR-1 Zener diodes are used in a variety of applications such as voltage regulation, voltage sensing, surge protection, and voltage equalization.

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