SMBJ4739A/TR13

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The SMBJ4739A/TR13 is classified as a single Zener diode, from the larger category of diodes. As a single Zener diode, its primary use is in the regulation of voltage, meaning that its application field involves the protection of electrical circuits. The diode is a low power device, meaning that it is most commonly used in low power applications, such as consumer electronic circuits, computer systems and automotive systems.

The SMBJ4739A/TR13 is capable of passing current in either direction, meaning the output voltage is typically higher than the input voltage should current not be passing through. However, when current is applied, the diode will attempt to limit the current, which reduces the output voltage to a nominal value. This drop in voltage is beneficial, as it will protect the circuit from overload, overheating and other electrical issues.

The SMBJ4739A/TR13 has a power dissipation of 0.4W, a reverse bias voltage rating of 7V and a reverse current of 100nA (at 25° C). Additionally, the device has a high surge power of 800pF, meaning that it is capable of dealing with short electrical surges. This is useful for automotive applications, as the sudden increase and decrease in voltage when turning the engine on and off can create high electrical surges.

In terms of working principle, this diode is what is known as a PN junction device. The junction is formed when two materials which are highly doped with opposite charge carriers come into contact. When an electric field is switched on, the electrodes become polarised. This causes the junction to become an impediment to current flow, forcing the current to travel through the opposite direction to its usual path - thus limiting voltage.

In the case of the SMBJ4739A/TR13, the junction is formed between a p-type semiconductor and an n-type semiconductor. This junction allows for a specific amount of current to pass and a specific voltage to settle. When the input voltage surpasses the threshold, current is diverted and the voltage drops back to the desirable level. This allows for the device to protect a circuit from excessive voltages and allow safe electricity to be maintained.

The SMBJ4739A/TR13 is a versatile device which can be used in a variety of low power applications. Its ability to regulate voltages in order to prevent damages to circuits, makes it an essential component for a variety of consumer electronics and automobiles. Furthermore, its ability to deal with short electrical surges makes it fitting for automotive systems and other applications which see short bursts of electricity.

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