1N4743A,133

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Diodes - Zener - Single

1N4743A is a single Zener diode encapsulated in a highly heat-resistant standard DO-41 package. It is a general purpose diode which has a wide range of applications in the industrial, commercial, and electronic fields. This diode works as an efficient rectifier as it does not require any voltage higher than a threshold value for the circuit. Its versatility makes it a great choice for applications such as voltage leveling and regulated power supplies.

Application Field

• Voltage Clamping
• Over Voltage Protection
• Surge Protection
• Noise Suppression
• Indicators and Alarms
• DC-DC Converters
• Voltage Regulation
• Clippers and Clampers
• Frequency Clamping

Working Principle

1N4743A is a single Zener diode which works on the principle of Zener breakdown. Zener break down refers to the process where electrons escape from their normal trajectory and form a current-carrying path between two points in a semiconductor. At a certain voltage, electrons begin to break down, as the intensity of the electric field increases. This break down of electrons results in a current flow. The voltage at which this breakdown occurs is called the Zener voltage or the breakdown voltage. The 1N4743A Zener diode operates at a Zener voltage of 13V.

The Zener diode functions as a two-way rectifier, letting current flow in the reverse direction. This is because the Zener breakdown process occurs when the application of a voltage greater than the breakdown voltage is applied across the diode. Thus, when a voltage is applied greater than the breakdown voltage, this voltage will be regulated, and only a small amount of current flows through the diode. The excess current is then diverted away due to Zener effect which results in a more regulated output voltage.

On the other hand, in the forward bias, 1N4743A functions just like a normal rectifier and it is capable of handling high current. The Zener diode is able to withstand high currents because of its low forward voltage, which is typically below 0.4V at normal temperature. This makes the 1N4743A a great device for applications such as in current limiting, voltage clippers and voltage regulators.

Conclusion

The 1N4743A is a single Zener diode with a wide range of applications in the fields of industrial, commercial, and electronic. It works as an efficient rectifier and is ideal for applications in voltage levelling and regulated power supplies. The working principle of the 1N4743A is based on the Zener breakdown process and it is capable of handling high current due to its low-forward voltage. These features make the 1N4743A a great choice for many applications.

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