JANTX1N4489C

Series:	Military, MIL-PRF-19500/406
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	100V
Tolerance:	±2%
Power - Max:	1.5W
Impedance (Max) (Zzt):	250 Ohms
Current - Reverse Leakage @ Vr:	250nA @ 80V
Voltage - Forward (Vf) (Max) @ If:	1V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Through Hole
Package / Case:	DO-204AL, DO-41, Axial
Supplier Device Package:	DO-41

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The JANTX1N4489C is a diode specifically built for zener applications, and is part of a range of single zener diodes capable of dissipating up to 0.25 watts. This particular device offers its users a breakdown voltage of 4.7 volts, along with its typical zener impedance of 10ohms. The specified maximum operating temperature for the diode is 100 degrees Celsius. The JANTX1N4489C is based on standard PN junction technology, however it is designed to provide a very different functionality. The primary purpose of these diodes is to keep the voltage at one of its terminals , while they stand to regulate the input flow and maintain a constant output voltage. This particular application is called a “reverse breakdown voltage”.When the voltage applied across a PN junction exceeds the standard breakdown voltage, rapid electrical conduction occurs. This starts at the point of breakdown and henceforth maintains a constant voltage. Since it takes a certain amount of time for this rapid conduction to occur at the breakdown voltage, a time delay element may be introduced in series with the PN junction. This can be implemented in the form of a thermally sensitive element, whose temperature and hence resistance across the junction can be increased by increasing the current through it.Once the breakdown voltage is exceeded, the thermally sensitive element begins to heat up. This causes the resistance of the PN junction to increase, thereby causing the current to decrease. This reduction in current then maintains a stable voltage across the PN junction. When the voltage across the junction drops below the breakdown voltage, the increase in electric current will again cause the PN junction to exceed the breakdown voltage and the process begins again. This then is the basic principle of operation of the JANTX1N4489C, a single zener diode. The device comes with two terminals; one for applying the electric current and one for outputting the voltage. The zener diode will draw electric current from the source until the breakdown voltage is reached and then, due to the underlying principle of operation, the output voltage will be kept constant until the current is increased or decreased. This application of the JANTX1N4489C can be seen in a variety of fields, including the communication technology, medical systems and the automotive industry. Modern cars typically use zener diodes in their airbag system to ensure that the airbags deploy at a safe level of speed. The diode also comes in under the categories of overvoltage protection, voltage reference, devises and circuits and series regulators.The General Electric also produced versions of the JANTX1N4489C which are designed to increase reliability, reduce reverse recovery time, and improve temperature stability.The features of these improved diodes include a lower reverse leakage current and capacitance than the standard versions.The JANTX1N4489C is a single zener diode designed to be used in a wide range of applications due to its stability, reliability, and excellent operational characteristics.The device utilizes a standard PN junction system to provide a constant voltage output across its terminals, thus providing a very useful and practical application in many scenarios.

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