A1458 Optocoupler Datasheet [better] May 2026

A1458 Optocoupler — Datasheet Summary

Type: Phototransistor optocoupler
Isolation: Typically 5 kVrms (insulation rating varies by package)
Input LED forward voltage (Vf): ~1.2 V (typical)
Input forward current (If): Rated up to 20–50 mA (continuous), with typical driving currents in the 1–20 mA range for switching applications
Output transistor collector–emitter voltage (VCEO): ~30–80 V (depending on manufacturer variant)
Current transfer ratio (CTR): Typical range ~20%–160% (highly dependent on If and VCE)
Isolation resistance: ≥1e10 ohm at 500 Vdc (typical)
Propagation delay / switching: Turn-on and turn-off times in the microseconds to tens of microseconds range (slower than logic optocouplers)
Package options: 4-pin DIP, SMD variants possible; standard plastic package with clear or black epoxy

Slow or erratic switching:

If you are designing a circuit or replacing a component: a1458 optocoupler datasheet

"A" Logo: It might be an Avago (now Broadcom) or Vishay part. However, standard Avago part numbers usually follow formats like HCPL-xxxx or ACPL-xxxx.
Date Code: A1458 might be a date code (Year 2014, Week 58) rather than the part number. In this case, look for other markings like "817" (PC817) or "357" (PC357) printed often on a separate line.

For standard optocouplers like the A1458, the CTR can range anywhere from 50% to 300% depending on the specific bin/grade. Slow or erratic switching: Summary Recommendation If you