SML4739A-E3/61 Discrete Semiconductor Products

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Diodes form the backbone of electrical engineering technology, as they are the fundamental components of any electronic circuit. The SML4739A-E3/61 is one type of semiconductor diode, specifically a zener diode, which is used in the protection of sensitive circuits. This article will discuss the application fields and working principle of the SML4739A-E3/61 diode.

Application Fields

The SML4739A-E3/61 is a small signal zener diode, suitable for a wide range of applications. It is commonly used to provide protection from over-voltage and over-current in consumer electronics, automotive and industrial electrical systems, as well as for the stabilization of voltages in voltage reference circuits. As a general purpose diode, the SML4739A-E3/61 can be used in almost any application where the protection of a sensitive circuit from electrical damage is necessary.

Working Principle

The SML4739A-E3/61 zener diode is a current-regulated diode, where the reverse current is held constant regardless of the applied reverse voltage. This is because the diode has a negative temperature coefficient which reduces the voltage necessary to maintain current conduction in the reverse direction. When the normal diode breakdown voltage is reached, the diode will allow an increased level of reverse current to flow.

The zener voltage, also known as the knee voltage, is the voltage at which the diode begins to conduct in the reverse direction. This voltage is usually specified as a minimum voltage at which the diode will conduct. For example, for the SML4739A-E3/61, the specified minimum knee voltage is 9.1V.

When an external voltage reaches the specified knee voltage of the diode, the diode will allow an increased level of reverse current to flow. This allows a limited amount of current to pass from the external voltage source to the protected circuit, protecting it from the risk of over-voltage or over-current. Therefore, the SML4739A-E3/61 zener diode is essentially an electronic fuse, which will protect the circuit from electrical shocks.

The SML4739A-E3/61 diode also has a low forward voltage drop, meaning it can be used in circuits where low voltage drops are necessary, such as AC voltage circuits with high frequency signals.

Conclusion

The SML4739A-E3/61 zener diode is a small signal zener diode, suitable for a wide range of applications. It is commonly used to provide protection from over-voltage and over-current in consumer electronics, automotive and industrial electrical systems, as well as for the stabilization of voltages in voltage reference circuits. The diode has a negative temperature coefficient which reduces the required reverse voltage to achieve current conduction, and a low forward voltage drop, making it suitable for use in high frequency circuits.

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