3EZ120D2E3/TR12

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The 3EZ120D2E3/TR12 is a single Zener diode, a type of diode that is used in a variety of applications. This diode is capable of dissipating up to 0.58 Watts of power and has a maximum forward voltage drop of about 1.5V. This Zener diode features a low breakdown voltage of 12V and an operating temperature range of -55 to +125 Celsius (C). It offers excellent stability over temperature and has a reverse breakdown voltage tolerance of 5V. It also has a low voltage stress of less than 1V and a reverse current of 25mA.

Application Field

The 3EZ120D2E3/TR12 is most commonly used in voltage regulator and voltage clamping circuits. Zener diodes are used in these applications as they are able to hold a voltage at a specific level even when the power source or load connected to them changes. They are also normally used to protect other components from voltage spikes, or clamp surges to a safe level.

This Zener diode could also be used to construct an AC dimmer circuit, though it would need other components in order to complete the circuit. The dimmer circuit would use the Zener diode to convert the AC input voltage, which can vary significantly depending on the initial peak to peak voltage, so that the output voltage is a steady 12V.

Working Principle

The working principle of a Zener diode is that when a reverse bias voltage is applied to the diode, minority electrons, which are immobile when the voltage is below the breakdown voltage, get free and drift in the direction of the electric field. This causes an avalanche breakdown effect which increases the current in the diode exponentially. The voltage required to achieve this is called the Zener breakdown voltage.

When a forward bias voltage is applied to the diode, electrons and holes recombine near the junction and generate a charge, which produces a voltage across it. This voltage is called the Zener voltage and its magnitude remains constant regardless of variations in current.

In general, Zener diodes are able to regulate voltage levels to a specific voltage by dissipating the excess voltage as heat. The voltage regulation occurs because at a specific voltage the Zener diode begins to behave like a normal diode, which allows current to flow without regulation. This means that when the input voltage is higher than the specified breakdown voltage of the diode, the excess voltage is automatically discharged as heat.

When constructing a circuit that incorporates the 3EZ120D2E3/TR12, it will be necessary to take into account the power dissipation and the maximum forward voltage drop of 1.5V. As with all diodes, proper care must be taken to ensure that it is not allowed to exceed its rated power dissipation; otherwise, it can cause permanent damage to the diode.

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