Optocoupler Datasheet — A1458

If the A1458 datasheet shows a zero-crossing circuit , this part is designed for solid-state relays (SSRs), not general-purpose switching.

: No internal electrical connection. Leave isolated on the PCB layout. a1458 optocoupler datasheet

If you can share (PCB marking, schematic, BOM), I can help decode it. If the A1458 datasheet shows a zero-crossing circuit

An analytical breakdown of the technical specifications, pinout architecture, and circuit implementations found within the official guides engineers in optimizing its usage. Technical Specifications and Core Features a1458 optocoupler datasheet

For standard optocouplers like the A1458, the CTR can range anywhere from depending on the specific bin/grade.