1N4745AHR1G

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	16V
Tolerance:	±5%
Power - Max:	1W
Impedance (Max) (Zzt):	23 Ohms
Current - Reverse Leakage @ Vr:	5µA @ 12.2V
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	DO-204AL, DO-41, Axial
Supplier Device Package:	DO-204AL (DO-41)

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Introduction

A 1N4745AHR1G is a single Zener diode, a type of semiconductor component. Its main purpose is to regulate a specific voltage level. It works as a voltage regulator and rectifier and can be used in applications such as linear power supplies, battery charging, and voltage protection circuits.

Overview

The 1N4745AHR1G is in a small SOT-23 package and provides better power dissipation and improved reliability compared to other Zener diodes. It has a 5.6V and 37mA maximum Zener current with a maximum surge power dissipation rating of 350mW. The Zener diode has a reputation for stability and consistent performance and, as expected from such a component, it has a tight voltage tolerance of as low as 0.4V.

Application Fields

The 1N4745AHR1G is used in many applications requiring stabilized voltage levels, most notably linear power supplies and battery charging. It can also be used in overvoltage protection circuits, where the component quickly drops out a larger voltage once it is allowed to exceed a certain threshold.The Zener diode is also used in various types of test and measurement equipment, such as handheld voltmeters, digital thermometers, and current shunt monitors, due to its stable and consistent performance.

Working Principle

The 1N4745AHR1G is a two-terminal voltage regulator, meaning that it draws a constant current by adapting its internal resistance. This is accomplished by the internal structure of the component.It consists of two main parts: the n-type and the p-type. The n-type region is highly doped, which causes it to have a higher current flow than the surrounding regions. With a certain applied voltage, a current-voltage characteristic is created, with a suddenly increased current (above the Zener voltage) providing the regulation.When a current is applied to a Zener diode’s cathode, the electrons flow through the n-type region and into the p-type region. When the voltage exceeds the Zener voltage, the excess electrons are rapidly swept out by the curtain of electric field and flow in the external circuit.

Conclusion

The 1N4745AHR1G is a single Zener diode, most oftentimes used for regulating a specific voltage level in applications such as linear power supplies and battery charging, and for overvoltage protection circuits. It works by creating a current-voltage characteristic, with the Zener voltage acting as a threshold where the current suddenly increases. The component offers improved reliability, power dissipation, and a tightly controlled voltage tolerance.

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