1SMA4747 R3G

Diodes - Zener - Single

The 1SMA4747 R3G is a diode that is part of the Zener Diode products. Zener diodes are used as voltage regulators, as they exhibit a voltage that is independent of current or temperature. This product specifically can be used for a general application on switches and relays, or in applications corresponding to the telecom sector.

Working Principle

Zener diodes are designed to operate in the direction of reverse current, or break over reverse bias.

When a zener diode is placed in a circuit with voltage in the forward bias direction, there is no current flow until the voltage is greater than the threshold voltage. This threshold voltage is designated as the Zener Voltage and is valid only in the region of reverse bias. This Zener Voltage remains relatively constant regardless of the changes in reverse current or temperature.

When in the region of reverse bias, the diode acts as if it were connected to a voltage source with a thermal voltage of temperature T and a current of I. The diode exhibits a breakdown voltage, which is dependent on the reverse current. This voltage is referred to as the Zener Voltage.

Application Field

The 1SMA4747 R3G Zener diode can be applied in the fields which require voltage regulation and resilience to current and temperature-related factors. This includes a large variety of industrial and general application fields such as telecom sectors, and use in switches and relays.

The 1SMA4747 R3G Zener diode also has some limitations to its use due to its power rating and current rating. The maximum current for this device is 150mA and the power dissipation is 350mW, making it unsuitable for applications that require higher power dissipation. In addition, the device has a maximum operating voltage of 6.2V and a reverse voltage of 5.0V, so it is also not suitable for use in applications where the operating voltage is higher.

The 1SMA4747 R3G diode is also an ideal fit for use in a variety of telecom-related applications due to its low noise (1 dB typical) and being able to tolerate a high reverse voltage (6.2V maximum). This device is commonly used in mobile phone base station power amplifiers, power supply chips and other telecom switching control systems to ensure the regulation of output voltage over different current situations.

Conclusion

In summary, the 1SMA4747 R3G diode is a Zener diode that is uniquely suited for a variety of applications with voltage regulation requirements. This includes being used in switches and relays, as well as in the telecom sector. Its Zener Voltage allows it to remain relatively constant regardless of changes in current or temperature. It is suitable for these applications due to its low noise level and ability to withstand a high reverse voltage.