Isolation and switching performance for industrial signal paths
The CQY80N is a 1-channel optoisolator with a phototransistor output that includes a base connection, packaged in a 6-DIP through-hole housing. Its 5000Vrms isolation rating makes it a fit for safety-barrier applications in motor drives, industrial power supplies, and PLC I/O modules where galvanic separation between control and power domains is required. The base terminal allows the designer to tailor switching thresholds or add feedback compensation, a feature not available on standard three-pin optocouplers.
The 50% minimum current transfer ratio at 10mA forward current is the spec that determines whether the output can drive a logic input or a small load across the isolation barrier — a CTR below 50% at the operating If means the output may not saturate cleanly, especially at cold temperature. The Vce saturation of 300mV max at rated current keeps the output drop low enough for 5V logic families without an extra pull-up resistor. Output rated to 32V and 50mA per channel gives headroom for driving 24V industrial logic inputs or small relays directly. Rise and fall times of 7µs and 6.7µs typical are adequate for 10 kHz to low-100 kHz switching; for faster signals, a logic-output optocoupler would be needed.
The 1.25V typical forward voltage and 60mA max forward current are standard for an IR LED input stage, compatible with 3.3V and 5V logic outputs through a series resistor.