1N4739A TR

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Diodes are electronic components used to conduct electricity in a single direction while blocking current movement in the opposite direction. A common type of diode found in electronic circuits is the zener diode. In this article we explore the application field and working principle of the 1N4739A TR.

A 1N4739A TR is a glass passivated, single zener diode. It typically has a 3.4V zener voltage, a 400mW power dissipation, an operating temperature range of -55 to + 175°C. Its maximum reverse leak current is 100nA at a voltage of 3.4V. 1N4739A TRs are often used as reference sources and in voltage clamping applications such as surge suppression circuits.

The operation of a zener diode is very similar to an ordinary diode. In forward biased mode, the diode will behave like a usual diode, passing current in the forward direction. However, when the applied voltage across the diode is greater than the zener voltage, the device will allow current to flow in the opposite direction. This is known as reverse bias mode, and allows the device to be used as a regulator.

The zener breakdown process that occurs in the 1N4739A TR is caused by an avalanche effect. When the applied reverse voltage is greater than the zener voltage, it causes electrons to be accelerated to near the speed of light, creating a "chain reaction" which produces large amounts of free electrons and free holes in the depletion region of the diode. The free charge carriers act like two series of charges, allowing current to flow in the opposite direction.

The 1N4739A TR has a variety of uses. It can be used to regulate the output voltage of power supplies and other voltage control circuits, provide over-voltage protection for input stages, and as a reference source for op-amp circuits. In addition, the device can be used in waveform generators, pulse shapers and as a part of a voltage divider network. Furthermore, it can be used in digital circuits to protect devices from potential damage due to higher voltages.

In conclusion, the 1N4739A TR is a single zener diode with a wide range of application including surge suppression circuits, power supplies, waveform generators, pulse shapers, voltage divider network and over-voltage protection. The device operates based on the avalanche effect that occurs when the applied voltage is exceeding the zener voltage, allowing the current to flow in the opposite direction.

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