S21MT2

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Optoisolators are electronic components that are used to isolate the input and output of two systems in order to protect the connected components from electrical noise and to provide electrical isolation of the two systems. One popular type of optoisolator are those with triac, SCR output. The S21MT2 is an example of such a component.

The S21MT2 is an optoisolator designed specifically for use in microcomputer and electronic home appliance applications. It is a two-channel TRIAC/SCR output optoisolator that can be used for switching into load circuits and for controlling audio, video, lighting, motor, power, relay, and other control circuits. The S21MT2 has excellent switching characteristics, and its high insulation voltage and wide-range input voltage makes it a great choice for a variety of applications.

In terms of its structure, the S21MT2 consists of two separate components: an optocoupler and a TRIAC/SCR output. The optocoupler consists of an infrared emitting diode (IRED) and a phototransistor. The TRIAC/SCR output, on the other hand, is an integrated circuit that is capable of switching between ON and OFF states.

The working principle of the S21MT2 can be broken down into three steps. The first step is to provide a control signal to the optocoupler. This signal is generally a low voltage or low current signal from a microcomputer or electronic appliance control circuit. The IRED of the optocoupler then emits an infrared light beam which is then received by the phototransistor. The phototransistor then converts the light into an electrical signal which is then sent to the TRIAC/SCR output.

Step two is where the output of the optocoupler is used to control the TRIAC/SCR output. Depending on the signal received from the optocoupler, the TRIAC/SCR output will either switch to an ON or OFF state. When the signal from the optocoupler is low, the TRIAC/SCR output will be switched to the OFF state, while when the signal from the optocoupler is high, the TRIAC/SCR output will be switched to the ON state.

The third and final step is to use the output of the TRIAC/SCR output to control the connected load circuit. When the TRIAC/SCR output is switched to the OFF state, the load circuit will be disconnected, and when the TRIAC/SCR output is switched to the ON state, it will be connected.

The S21MT2 optoisolator is suitable for a variety of applications due to its wide range of features such as its high insulation voltage, wide common-mode transient immunity, creepage distance, minimal EMI (electro-magnetic interference), and a near zero off-state leakage current. It can be used in electronic control and home appliance applications, as well as applications such as audio switching, power supply control, motor control, relay control, and lighting control.

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