1458 Optocoupler Datasheet ((link)) -

(often colloquially called the A1458) manufactured by Avago (now Broadcom). STMicroelectronics

The 1458 is a single-channel, phototransistor output optocoupler designed for electrical isolation between input and output circuits. It consists of a Gallium Arsenide (GaAs) infrared emitting diode optically coupled to a silicon NPN phototransistor, packaged in a standard 6-pin DIP (Dual In-line Package). 1458 optocoupler datasheet