1SMA4742TR Discrete Semiconductor Products

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A 1SMA4742TR is a single zener diode from ON Semiconductor, specifically a 7.2 V zener, 0.5 W diode. This diode features low-current conduction, making it ideal for use as a transient suppressor or voltage reference in electronic circuits. Additionally, it can be used as a voltage regulator in a variety of different applications.

In terms of its application field, the 1SMA4742TR is particularly well-suited for providing transient overvoltage protection in AC- or DC-powered circuits. It can be used as a clamp diode in clamping applications and as a surge suppressor in power supplies. It is also popularly used as a reference voltage source in wide range of digital and analog circuits.

In terms of its working principle, the 1SMA4742TR operates similarly to other zener diodes. It consists of a junction between two layers of semiconductors, with the forward region and reverse region of the junction connected to a pair of electrodes. Under forward bias conditions, it operates as an ordinary diode, allowing most of the current to pass through it without any interference. When reverse biased conditions occur, it stops conducting current and instead, the zener breakdown voltage is triggered by the voltage potential across the junction.

The breakdown voltage of the 1SMA4742TR is 7.2 V. Once the voltage potential exceeds this value, the breakdown occurs, at which point an avalanche of electrons occurs, allowing current to flow through the diode in the reverse direction. This allows the diode to regulate the voltage level by limiting the maximum amount of current that can flow through it in the reverse direction. As a result, it can be used to provide a stable voltage reference over a wide range of conditions.

Overall, the 1SMA4742TR is a highly useful device for regulating voltage levels. Its low-current conduction makes it particularly well-suited for applications in which a regulated voltage is necessary and it can provide effective protection against transient overvoltage conditions as well. Its 7.2 V breakdown voltage makes it a great choice for providing voltage references in many different types of circuits.

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