1N4728A TR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Voltage - Zener (Nom) (Vz):	3.3V
Tolerance:	±5%
Power - Max:	1W
Impedance (Max) (Zzt):	10 Ohms
Current - Reverse Leakage @ Vr:	100µA @ 1V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 200mA
Operating Temperature:	-65°C ~ 200°C
Mounting Type:	Through Hole
Package / Case:	DO-204AL, DO-41, Axial
Supplier Device Package:	DO-41

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Overview
1N4728A TR is a low-power zener diode, designed specifically to protect chips, sensors and other electronic components from excessive voltages. It is a small size, metal can package, with a voltage rating of 3.9V. Its unique design makes it highly reliable and provides excellent protection of components in a wide range of applications.Application Field
1N4728A TR is widely used in various applications, including: integrated circuit protection, circuit protection, overvoltage protection, RF protection, frequency protection, power supply protection, transducer protection, surge protection, and line-voltage protection. It is also used as a voltage regulator in control circuits.Working Principle
1N4728A TR operates on a basic principle of supplying current to the device whose output voltage is equal to the zener voltage of the diode. The current applied is proportional to the reverse voltages and the characteristics of the zener diode, and is limited by the reverse junction leakage current. When the reverse voltage exceeds the zener voltage, the device provides a constant voltage across the zener diode terminals which is equal to the zener voltage of the diode. If a higher current is required, an external resistor can be connected in series with the diode, in order to limit the current to the device. The zener diode can also be used in series with other diodes, as a part of a voltage regulator circuit.Advantages1N4728A TR provides several advantages, including:

• High reliability and long life due to low leakage current.
• High precision voltage regulation - the reverse voltage is held constant.
• Capable of delivering large current with low power dissipation.
• Stable operation in a wide temperature range.
• Accurate control of voltage and current in circuit protection applications.
• Easy to install in limited spaces due to its small size and metal can package.

Disadvantages
The 1N4728A TR has some drawbacks: The voltage regulation can be affected by a change in temperature, and the reverse current increases with the decrease in temperature, which can lead to higher power dissipation. It is also limited by its limited reverse voltage range, from 2V-3.9V.Conclusion
The 1N4728A TR is an excellent choice for chip protection, circuit protection, overvoltage protection and surge protection. It is highly reliable and offers excellent protection of components in a wide range of applications. Despite some drawbacks, it is a versatile device and provides great performance in a variety of applications.

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