SZMM3Z3V9ST1G Discrete Semiconductor Products

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	3.9V
Tolerance:	±3%
Power - Max:	300mW
Impedance (Max) (Zzt):	90 Ohms
Current - Reverse Leakage @ Vr:	3µA @ 1V
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:	MM3Z3V9

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Diodes - Zener - Single

The SZMM3Z3V9ST1G is a single Zener diode designed to protect equipment from voltage fluctuations. This diode is a type of semiconductor device that is used in many applications to provide overvoltage protection. It has two electrodes, the anode and the cathode, and works by limiting the amount of current that can flow through the device. When a voltage exceeds a certain level, the diode becomes reversed biased and the current is reduced.The SZMM3Z3V9ST1G is primarily used in circuits that require protection from high voltage. This diode can be used to regulate power supply output voltages, to protect against ESD (electrostatic discharge), to prevent damage to equipment connected to an AC power source, and to prevent damaging surges of current. It also offers protection against transient voltage spikes on the power supply line.The SZMM3Z3V9ST1G is usually connected in series with a resistor or a surge suppressor. The resistor or surge suppressor limits the amount of current that is allowed to flow through the diode. By limiting the current, the diode is protected from damage due to high voltages.The SZMM3Z3V9ST1G is usually made of silicon, though other materials such as germanium, gallium arsenide, and other semiconductors can also be used. Silicon is the most common material as it has the highest breakdown voltage. It also offers great protection against ESD, as it has a relatively low threshold voltage.The SZMM3Z3V9ST1G has two pins, one for the anode, and one for the cathode. The cathode is the negative side of the diode, and it has a special marking, usually a triangle or dot, to distinguish it from the anode. The anode is the positive side of the diode, and it is connected to the positive voltage source.The working principle of the SZMM3Z3V9ST1G is simple. When the voltage across it is greater than the breakdown voltage of the diode, it is said to be in the “reverse biased” state. In this state, the diode does not conduct, and the voltage across it remains constant. If the voltage across the diode is lower than the breakdown voltage, the diode will normally be in the “forward biased” state, where it conducts and allows current to flow through it.In addition to protection from overvoltage, the SZMM3Z3V9ST1G can also be used to regulate the voltage of a power supply. When the voltage is higher than the breakdown voltage of the diode, it reduces the voltage to the level of the breakdown voltage. This feature allows the power supply to operate within a certain range, allowing the power supply to maintain a constant output voltage.The SZMM3Z3V9ST1G is a useful device in many circuits, and its protection and voltage regulation capabilities make it a popular choice for many electronics applications. Its wide range of uses and its simple working principle make it a convenient and cost-effective device for many uses.

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