A1458 Optocoupler Datasheet ~repack~ May 2026

A1458 optocoupler (frequently cross-referenced as the HCPL-1458 or HCPL-A1458

Isolating low-voltage MCUs from high-voltage power stages to prevent damage from spikes. Industrial Systems: a1458 optocoupler datasheet

• Pin 1: Anode (LED positive)
• Pin 2: Cathode (LED negative)
• Pin 3: Emitter (transistor source)
• Pin 4: Collector (transistor drain)

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. Pin 1: Anode (LED positive) Pin 2: Cathode