PC3ST21NSZCF

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Optoisolators - Triac, SCR Output

PC3ST21NSZCF is a kind of optoisolator which features triac or SCR outputs. It applies optoelectronics technology to electrical isolation and switching of output loads. Technically, it is a single-channel, isolated triac power switch.

Application Field

The application field of the PC3ST21NSZCF optoisolator is mainly in the control of lighting and communicational circuit. It is used for managing lighting devices, such as dimmers, light switches, motor speed control sensors, etc.; It can also be used in telecommunications applications, such as telephones, modems, pagers, faxes, etc.

Working Principle

The basic working principle of the PC3ST21NSZCF optoisolator is the displacement of isolation via light waves. Inside the optoisolator, there is an infrared LED with a detection diode. When the LED is illuminated, the detector diode receives the light prompting either a triac or SCR switch. The triac or SCR switch provides the necessary electrical isolation from the input/output of the optoisolator.

The PC3ST21NSZCF optoisolator features a lighting detection threshold of 1.6V maximum. It also has an extremely low supply current of 8mW, making it a great choice for power efficient applications. The response time of the PC3ST21NSZCF optoisolator is also fast. From the time the LED is illuminated to when the output reaches its final state, the optoisolator takes less than 1ms.

The maximum allowable dissipation power of the PC3ST21NSZCF optoisolator is 100mW, while its maximum short-circuit current is 2A.

Conclusion

PC3ST21NSZCF optoisolator features triac or SCR outputs for electrical isolation and switching applications. It is mainly employed in lighting and communicational circuits. The working principle of the optoisolator relies on the displacement of isolation via light waves. It has great power efficiency, with a maximum supply current of 8mW and a maximum threshold voltage of 1.6V. Its maximum allowable dissipation power is 100mW, while its maximum short-circuit current is 2A.

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