PC -817 is also known as an optocoupler. It consists of and Infra Red Emitting Diode (IRED). This IRED is coupled to a photo transistor optically and not electrically. It is closed in a four (4) pin package. This package is usually available in two different forms. The first one is wide lead (Pb) spacing option and the second one is SMT gullwing lead form option.
PC 817 has an internal LED and a photo transistor. The photo transistor’s base becomes activate when LED throws light on it. The output obtained can be divided into two formats either common emitter or common collector. But the configuration is mostly common emitter. If the LED does not glow, transistor remains off and hence there will b no output generated by the opto coupler i.e. PC-817. PC 817 has different feature e.g. double transfer mold package, current transfer ratio, different CTR ranks available, RoHS comliant, lead (Pb) free etc. Its real life application includes noise suppression in switching circuits, programmable controllers, signal transmission between circuits having different voltages, signal transmission between different impedance etc.
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