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DESIGNING FOR OPTOCOUPLERS WITH BASE PIN

GENERAL

Optocouplers (optical couplers) are designed to isolate electrical output from input for complete elimination of noise. They have

been used conventionally as substitutes for relays and pulse transformers. Today's current technology in the area of microcom-

puters creates new applications for optocouplers.

This manual describes the characteristics of typical optocouplers. Also included are notes on designing application circuits for

typical optocouplers (with a base pin) for better comprehension. NEC's typical optocouplers with or without base pins are listed

on the following pages.