A1458 Optocoupler Datasheet Updated May 2026

Understanding the A1458 Optocoupler: Features, Specs, and Applications

Internal Schematic:

Inside the package, pin 1 connects to the LED’s anode, pin 2 to its cathode. The phototransistor sits with its collector on pin 4 and emitter on pin 3. There is no base pin exposed; base current is generated solely by illumination. a1458 optocoupler datasheet

The "Absolute Maximum Ratings" table for the A1458 is non-negotiable: The "Absolute Maximum Ratings" table for the A1458

How to Read a Typical Circuit from the Datasheet

Avoid the A1458 when:

, which allows the device to maintain signal integrity even in environments with severe electromagnetic interference. Supply Voltage ( cap V sub cap C cap C end-sub : Operates between 4.5 V and 5.5 V , compatible with standard TTL and CMOS logic levels. Output Type Open Collector Understanding the A1458 Optocoupler: Features

To get the most out of your A1458, keep these design principles in mind:

However, based on common optocoupler naming conventions and visual similarities, here are the three most likely components you might be looking for, along with a summary of their datasheets: