1SMA4758TR

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The 1SMA4758TR is a single-type zener diode. This component widely used in many applications to control the voltage or to regulate the reverse current. In this article, the application field and working principle of 1SMA4758TR will be discussed.

Application Field

The major application field of the 1SMA4758TR is voltage regulation. It often seen in consumer electronics like AC or DC adaptors or power supplies. This zener diode is also used in secondary protection circuits for overvoltage protection. As well as, the 1SMA4758TR can used in a bridge rectifier circuit to recover damaged battery cells.

In addition, 1SMA4758TR can be used in regular amplifier applications such as preamplifiers, mixers and voltage-controlled audio amplifiers used in a range of consumer and professional AV equipment. Furthermore, this diode can be used in various resistive bleeders to drain the built-up charge on a capacitor after the circuit has been turned off.

Working Principle

The 1SMA4758TR zener diode has been widely used because of its simple design and low-cost construction. It consists of a cathode and an anode, both of which are heavily doped to make the diode junction narrow and to create a large potential gradient. Additionally, the diode also contains doping impurities that create a zener or breakdown voltage at which the anode-cathode junction becomes reverse-biased and starts to conduct current.

The typical breakdown voltage for 1SMA4758TR is 8V with a maximum of 8.7V. This diode exhibits higher breakdown voltage than other standard zener diodes, making it suitable for higher voltage circuits. The maximum rated current of this diode is 100mA, which is enough for most low power applications.

Another interesting property of the 1SMA4758TR is its temperature coefficient. The temperature coefficient of the 1SMA4758TR is relatively low, which makes it a good choice for powering circuits that require stable voltage even under temperature changes. In addition, this diode is also immune to transients, making it very reliable in applications such as surge protection circuits.

Conclusion

In conclusion, the 1SMA4758TR is a single-type zener diode and is used in a wide range of applications, such as in voltage regulation, secondary protection circuits, bridge rectifier circuits, and resistive bleeders. This diode has a simple design and a low-cost construction, with a breakdown voltage of 8V and a maximum rated current of 100mA. Additionally, it also has a low temperature coefficient and is immune to transients, making it a reliable choice for sensitive circuits.

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