A1458 Optocoupler Datasheet -

If the output only drops to 1.5V, the A1458 has a damaged phototransistor or a false datasheet.

Page 3 of the official usually contains a "Test Circuit" diagram. Here is the standard configuration for digital signal isolation: a1458 optocoupler datasheet

In the world of electronics, galvanic isolation is a critical requirement for safety, noise immunity, and signal integrity. Optocouplers (also known as opto-isolators) are the backbone of this technology. Among the myriad of components available, the stands out for its specific balance of speed, current transfer ratio, and isolation voltage. If the output only drops to 1