SZMMSZ18ET1G

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	18V
Tolerance:	±5%
Power - Max:	500mW
Impedance (Max) (Zzt):	45 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 12.6V
Voltage - Forward (Vf) (Max) @ If:	900mV @ 10mA
Operating Temperature:	-55°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SOD-123
Supplier Device Package:	SOD-123
Base Part Number:	MMSZ18

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Introduction

The SZMMSZ18ET1G, manufactured by Shenzhen MicroSemi Co., Ltd, is a surface mount zener diode that falls into the category of single diodes. In this article, we will provide an overview of both the application field and the working principle of this device.

Application Field

The SZMMSZ18ET1G can be applied to a wide variety of applications including voltage regulation, voltage clamping, polarity protection, noise reduction, battery protection, and current regulation. It is a small, low profile, low impedance device that can effectively protect circuit components.For voltage regulation, the diode can be used to regulate the voltage in a circuit by dropping any voltage above the zener voltage to a stable level. This is useful in preventing overvoltage damage to other components of a circuit, such as ICs, communication chips such as Ethernet, WiFi, Bluetooth, and cellular chips, and voltage regulators.The diode can also be used for voltage clamping. When the applied voltage rises above the Zener voltage, the diode will conduct electricity and reduce the voltage to the Zener voltage. This can be used to protect sensitive components from overvoltage damage.For polarity protection, the diode can be used to protect a circuit from reverse current damage. This is useful in applications where the power supply may occasionally be reversed.The SZMMSZ18ET1G can also be used for noise reduction. By keeping the noise out of a circuit, the diode can help ensure that signals remain pure and uninterrupted.For battery protection, the diode can be used to prevent overcharging and over-discharging, as well as providing protection against accidental reversal of polarity. This is often used in conjunction with a battery management system.Finally, the SZMMSZ18ET1G can be used for current regulation. By regulating current flow, the diode can help ensure that power is distributed efficiently and safely throughout a circuit.

Working Principle

The SZMMSZ18ET1G is a zener diode that works by having an intentional reverse breakdown voltage. When the zener diode is no longer able to handle the electrical current, it will begin to break down, allowing the current to flow in the reverse direction. This creates a stable voltage across the diode\'s terminals.When the applied reverse voltage is greater than the Zener voltage, the diode will conduct electricity in the reverse direction and absorb the excess energy, thus preventing damage to other components in the circuit.

Conclusion

The SZMMSZ18ET1G is a single zener diode that can be used in a wide variety of applications. It is a small, low profile device that can be used for voltage regulation, voltage clamping, polarity protection, noise reduction, battery protection, and current regulation. Additionally, the diode works by having an intentional reverse breakdown voltage which allows it to absorb excess energy and protect other components in a circuit.

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