1N4756E3/TR13

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Diodes are a type of electronic component which act as a one-way valve, allowing electricity to flow in only one direction. A Zener Diode is similar to a common diode but is specifically designed to conduct current in the reverse direction, when a certain pre-determined voltage (known as the Zener Voltage) is reached. 1N4756E3/TR13 is an example of single Zener Diodes from the 1N47xx series.

The application field of 1N4756E3/TR13 Zener Diodes are generally used in voltage regulation and surge protection circuits. In the simple circuit below, 1N4756E3/TR13 Diodes regulate the output voltage to a constant 5V level regardless of changes to the input voltage.

In this circuit, the input voltage is allowed to vary between 0-9V and the output voltage is regulated at 5V. This is achievable because the 1N4756E3/TR13 Zener Diode conducts electricity when the voltage is greater than 5V and prevents the voltage from increasing any further. The Zener Diode is reverse biased, meaning it only conducts in the reverse direction in order to regulate the output voltage.

The working principle of a Zener Diode differs from a common diode due to the Zener breakdown effect. Under normal circumstances, a diode will not allow any current to flow in the reverse direction. However, when the voltage across the diode becomes too high, the electrons in the N-region can overpass the potential barrier and recombine with the holes in the P-region. This effect happens quicker than the actual breakdown of the diode which is why Zener Diodes are specifically used as voltage regulator. The amount of voltage required to cause Zener breakdown in the diode is known as the Zener Voltage and varies from diode to diode.

1N4756E3/TR13 are the typical Zener Diodes available on the market. They have a maximum power rating of 0.25W and a reverse breakdown voltage (Vz) of 5.6V. The current passing through the diode in the reverse direction is measured in volts/ohm and is known as the Zener Impedance (z). For the 1N4756E3/TR13 Zener Diode it has a Zener Impedance of 5V/47 ohms.

In conclusion, 1N4756E3/TR13 Zener Diodes are mainly used in voltage regulation and surge protection circuits. They have a very low power rating and a relatively high Zener Voltage rating. The Zener diode’s ability to prevent the voltage from increasing beyond a certain level makes it an advantageous component when constructing power supply circuits.

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