1PGSMA4742HR3G Discrete Semiconductor Products

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	12V
Tolerance:	±5%
Power - Max:	1.25W
Impedance (Max) (Zzt):	9 Ohms
Current - Reverse Leakage @ Vr:	1µA @ 9.1V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 200mA
Operating Temperature:	-55°C ~ 175°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	DO-214AC, SMA
Supplier Device Package:	DO-214AC (SMA)

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Introduction to PGSM A4742HR3G

PGSM A4742HR3G is a new type of Zener diode designed by Japan-based semiconductor company PGSM. As a single Zener diode, the PGSM A4742HR3G has two general applications: surge current protecting and voltage stabilizing. The working principle of the diode will be briefly discussed in the following section.

Application Field

The PGSM A4742HR3G is commonly used as a surge current protector and as a voltage stabilizer. As a surge current protector, the Zener diode helps protect the circuit from power surge or transient voltage spike. When the voltage spike exceeds the breakdown voltage, the diode begins to conduct electricity, allowing the excess current to be discharged and thus protecting the other components in the circuit. The PGSM A4742HR3G is often used in automotive electronic circuits and communication circuits.The other common use of the PGSM A4742HR3G is as a voltage stabilizer. With its voltage controlling capability, the Zener diode enables the circuit to maintain steady voltage levels, preventing any unstable voltage from disrupting the system. By regulating either AC or DC voltage, the diode stabilizes the output voltage and suppresses voltage-flicker. The PGSM A4742HR3G is often used in voltage regulating stages for various electronics such as digital amplifiers and LEDs.

Working Principle

The PGSM A4742HR3G is a Zener diode based on the Zener breakdown effect, which is a phenomenon that occurs in a wide variety of diodes. The Zener breakdown effect allows a reverse biased diode to conduct electricity and thus regulate voltage. When a diode is reverse biased, meaning that the voltage potential across the anode and cathode terminals are of opposite sign, and the reverse bias voltage is above the breakdown voltage of the diode, the diode will begin to conduct current and allow the voltage to be regulated. The breakdown voltage of Reverse Zener diodes like the PGSM A4742HR3G is adjustable and hence can be set to stabilize a desired voltage level.

Conclusion

To summarize, the PGSM A4742HR3G is a single Zener diode designed by PGSM. It is mainly used as a surge current protector and voltage stabilizer in various electronic applications. The working principle behind the diode is the Zener breakdown effect, which occurs when the diode is reverse biased and the voltage across its anode-cathode terminals exceeds its breakdown voltage. The PGSM A4742HR3G, with its adjustable breakdown voltage, enables users to stabilize the voltage in their circuits.

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