SZMM3Z18VT1G

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	18V
Tolerance:	±6%
Power - Max:	300mW
Impedance (Max) (Zzt):	45 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 12.6V
Voltage - Forward (Vf) (Max) @ If:	900mV @ 10mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SC-76, SOD-323
Supplier Device Package:	SOD-323
Base Part Number:	MM3Z18

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Introduction

SZMM3Z18VT1G is a type of single zener diodes, which is usually used for voltage regulation, clamping, and reference applications. It is a three-terminal device with an anode (A) and a cathode (K) and a third terminal or gate. This device is a very good electronic active component and has wide applications in many electronic circuits such as motor control, HVAC, and medical systems.

Applications

SZMM3Z18VT1G diodes are most useful when used in voltage regulation, where it is set to a specific forward voltage drop, usually 5V-33V, and then operates to hold the output voltage at a certain value, regardless of input voltage fluctuation or load current change. It can also be used to produce a negative bias, or to establish a reference of a load or ground potential. Clamping of high voltages can also be achieved by the SZMM3Z18VT1G diode. In this application, the diode is reverse-biased and operates to limit the voltage across an electronic load when there is a transients or spikes in the system. In addition, this single diode can also be used to separate circuits with different potentials or to reduce ground noise between two circuits.

Working Principle

The SZMM3Z18VT1G diode utilizes the zener effect to operate. A zener diode has a highly doped p-n junction, and when the voltage across it exceeds a certain value, it begins to break down, allowing current to flow in the reverse direction. This reverse current is a function of the applied voltage and is usually quite small. However, when the zener diode is reverse biased, it becomes conductive more quickly than a normal diode. The breakdown voltage of the SZMM3Z18VT1G diode is designed to be 3.18V and its maximum reverse current is rated at 1mA.The working principle of SZMM3Z18VT1G diode can be understood in simple steps. Firstly, when the voltage across the diode is less than 3.18V, it acts as a normal reverse biased diode and blocks the flow of current. Secondly, when the applied voltage exceeds 3.18V, the diode begins to conduct, with the voltage drop remaining at 3.18V and the current being dependent on the voltage across the diode. This allows the diode to act as a voltage regulator, maintain the reset voltages, and protect the circuit from overvoltage.

Conclusion

The SZMM3Z18VT1G diode is an excellent device for many different applications. It can be used for voltage regulation, clamping of high voltage transients, establishing a reference voltage, and separating two circuits with different potentials. The device utilizes the zener effect to achieve these applications, with a breakdown voltage of 3.18V and a reverse current up to 1mA. With proper usage and careful design, the SZMM3Z18VT1G diode can provide excellent performance and reliability in most electronic systems.

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