Optocoupler/LED/nixie tube/photoelectric device

QSD122, QSD123, QSD124 are silicon phototransistors with infrared transparent, black T-1 3/4 encapsulation.

The FOD852 includes a Gallium Arsenide Infrared Emitting Diode within a 4-pin dual inline plug-inencapsulation driving a silicon photo Darlington output (with integrated base emitter resistor).