1PGSMA4742HM2G

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1PGSMA4742HM2G application field and working principle

The 1PGSMA4742HM2G is an enclosed surface mount Zener diode with a rated reverse voltage of 42V. It is part of a family of low profile, single Zener diodes characterized by low leakage current and tightly regulated VZ, while having superior reverse surge capability and power dissipation. This device has an exact VZ of 42V and it’s full-wave surge avalanche peak voltage of 85V.

The 1PGSMA4742HM2G is mainly used in different types of voltage-stabilization circuits in which a certain amount of voltage is required to power up voltage-sensitive components. Other applications include overvoltage protection circuits, SCR-triggering circuits, and “crowbar” circuits for overvoltage protection. The device also finds applications in variable neutral-to-ground potentials, 4-wire bus bars, and high-level switching of silicon-controlled rectifier (SCR) harmonic grabbers.

Working Principle

Zener diodes are made from heavily doped silicon which has a high positive charges on the positive side and a large concentration of negative charges on the negative side. This creates a so-called depletion region, or potential barrier. Under reverse voltage, a Zener diode works by allowing a certain amount of current to flow across the depletion region.

When the voltage rises above a certain point, known as the Zener voltage, the depletion region can no longer contain the electric field, and the diode breaks down, allowing a current to pass through. This breakdown is known as “Zener breakdown” in which a large electric current proceeds quickly and the voltage drops to a secure value regardless of the input voltage.

Features of the 1PGSMA4742HM2G

The 1PGSMA4742HM2G offers high reliability and excellent stability over a wide range of temperatures and humidities. Moreover, it also offers low capacitance and low leakage current, low temperature coefficient and excellent surge capability.

The device offers reliable temperature coefficient over temperature ranges from -65°C to +150°C, and provides maximum reverse leakage current of 500nA (at 5V) and maximum forward leakage current of 0.75mA (at 10V). In addition, its maximum power dissipation (PD), total capacitance (C-t), reverse recovery time (trr) and total capacitance over temperature (C-t2) are higher than or equal to typical values.

The device offers strong resistance to ESD and its contact resistance is much lower than that of competitor products. It also offers excellent ESD performance in both single-ended and double-ended ESD tests.

Package

The 1PGSMA4742HM2G is available in an SOT-23 package with an integrated heat sink. This allows for simple and efficient thermal management, thus providing improved and long-lasting product reliability.

Conclusion

The 1PGSMA4742HM2G is an enclosed surface mount Zener diode with a rated reverse voltage of 42V and a full-wave surge avalanche peak voltage of 85V. It is part of a family of low profile, single Zener diodes characterized by low leakage current and tightly regulated VZ, while having superior reverse surge capability and power dissipation. Common applications of the device include voltage-stabilization circuits, overvoltage protection circuits, SCR-triggering circuits, and “crowbar” circuits for overvoltage protection. It is available in an SOT-23 package with an integrated heat sink to provide improved and long-lasting reliability.

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