1PGSMA4745HR3G

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The 1PGSMA4745HR3G is a single Zener diode under the Diodes - Zener - Single classification.

A Zener diode functions as a voltage regulator, dropping the out of range voltage to the desired voltage. The 1PGSMA4745HR3G will regulate any voltage up to 45 volts and can dissipate up to 0.75 watt of power. The specific application fields for the 1PGSMA4745HR3G will include voltage regulating, line protection and current limiting.

Working Principle

The 1PGSMA4745HR3G functions much like rectifier diodes in the sense that it enables the current to flow through it in one direction only. As a Zener diode, it also has a second mode operation where when the voltage is increased past the breakdown voltage of the diode, a current surge breaks down the reverse biased circuit. This effect is commonly referred to as the Zener or avalanche effect.

Once this junction breakdown is accomplished, the flow of current takes on the same characteristics reversed biased diodes. The Zener diode then creates a clamping action where excessive voltages are clamped to the value of the breakdown voltage. This can also take on the form of a voltage dropping circuit from the input voltage to the voltage of the breakdown. This is what the 1PGSMA4745HR3G is designed to do.

To ensure reliable operation and prevent the diode from excessive power dissipation, it is important to select the proper Zener diode type for the application. Because of this, careful consideration must be given to the power requirements and voltage operating range for the application before selecting the 1PGSMA4745HR3G or any other Zener diode.

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