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BPC817C (817C) optocoupler
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TLP250 optocoupler / isolator
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MOC3063 optocoupler
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4N25 transistor output optocoupler
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6N136 optocoupler
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MOC3061 optocoupler
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PC123 optocoupler
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MOC3081 Triac thyristor / SCR output
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