Optocoupler/LED/nixie tube/photoelectric device

4N38M, H11D1M, H11D3M, and MOC8204M are phototransistor type optocoupler opto-isolators. Gallium Arsenide Infrared Emitting Diodes are coupled to high voltage NPN silicon phototransistors. The device uses standard plastic six-pin dual-row plug-in encapsulation.