1N4494

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	160V
Tolerance:	±5%
Power - Max:	1.5W
Impedance (Max) (Zzt):	1000 Ohms
Current - Reverse Leakage @ Vr:	250nA @ 128V
Operating Temperature:	-55°C ~ 175°C
Mounting Type:	Through Hole
Package / Case:	Axial
Supplier Device Package:	Axial

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Diodes – Zener – Single – 1N4494 Application Field and Working Principle

The 1N4494 is a general-purpose zener diode in a DO-41 package. It is widely used in circuit protection, rectification, and voltage regulation applications due to its reliable and cost effective design. This diode, like other zener diodes, is typically used as an avalanche diode when forward biased and as a zener diode when reverse biased. This specific device has a zener voltage of 49 Volts, which is fairly standard as a general-purpose product.When forward biased, the 1N4494 works as a PN Junction diode, having a low forward voltage drop of about 1 to 2 V for comparably sized diodes. This means that it is suitable for a wide range of rectification and protection applications. When the diode is reverse biased, the device has a known and specified reverse breakdown voltage. This voltage is known as the Zener voltage, and is a standard value at 49V for the 1N4494 device. A PN-junction avalanche diode is created when the reverse voltage across the device exceeds the Zener voltage, resulting in a very sudden increase in current across the device. This sudden increase in current results in a limited amount of power dissipation, and therefore this diode can be used to protect sensitive components in the circuit. The Zener voltage of the 1N4494 can also be utilised to create a voltage regulator, by ensuring that the voltage applied to the anode of the diode never exceeds the Zener voltage. This is done by placing the diode in series with a variable current source, such as an adjustable resistor.The diode can also be combined with other components to create low-power voltage regulators, and in more complex applications it can be used to regulate the voltage across two different transistors. This is known as a cascade regulator, where the gain of the two transistors is used to control the output voltage in order to ensure a steady output voltage.The 1N4494 is suitable for a wide range of circuit protection, rectification, and voltage regulation applications. It is low power, reliable, and cost effective, with a Zener voltage of 49 Volts. The diode can be utilised as a avalanche diode when forward biased and a zener diode when reverse biased. When used as a zener diode, it creates a PN junction avalanche diode when the reverse voltage across the diode exceeds the Zener voltage, resulting in a limited amount of power dissipation, and therefore can be used to protect sensitive components in the circuit. The device can also be used to create a voltage regulator by placing the diode in series with a variable current source. It can also be combined with other components to create a low power voltage regulator, and in more complex applications, the diode can be used to regulate the voltage across two different transistors. This makes the 1N4494 a versatile and reliable component to have in any circuit design.

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