All Alternatives

Alternatives to ALPHA & OMEGA SEMICONDUCTOR AO3401

ALPHA & OMEGA SEMICONDUCTOR AO3401 and its qualified second sources, compared on form, fit and function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

Equivalent and substitute parts for ALPHA & OMEGA SEMICONDUCTOR AO3401

AO3401 compared against its qualified second sources
AO3401ALPHA & OMEGA SEMICONDUCTORAO3401AAlpha & Omega Semiconductor Inc.AOSS21311CAlpha & Omega Semiconductor Inc.+3more
FFF CompatibilityIdentical 3-pin SOT-23 package with matching pinout: Pin 1 is Gate, Pin 2 is Source, Pin 3 is Drain.Standard SOT-23 package footprint matches the original part's dimensions perfectly.Meets or exceeds all electrical ratings including Vdss (-30V), continuous drain current (-4A), and maximum gate-source voltage (±12V).Identical 3-pin SOT-23 package with matching pin assignment (1-Gate, 2-Source, 3-Drain).Standard SOT-23 package mounts directly onto the existing PCB land pattern.While primary current and voltage ratings are improved, the gate-source threshold voltage is higher (2.2V max vs 1.3V max), requiring a higher minimum drive voltage (4.5V vs 2.5V).
AI Summary

AO3401 by ALPHA & OMEGA SEMICONDUCTOR: Transistor: P-MOSFET; unipolar.

The AO3401A is the direct upgrade and manufacturer-recommended replacement for the obsolete AO3401, offering a fully active lifecycle. It maintains the exact same threshold, package, and voltage ratings while providing a slightly lower Rds(on) to improve efficiency.

  • Pin-compatible drop-in replacement in standard SOT-23 package
  • Active production status with high distributor availability
  • Slightly lower Rds(on) max (44mOhm vs 50mOhm) for reduced conduction losses

AOSS21311C is Alpha & Omega's officially recommended active substitute for the AO3401 series. It features a more robust gate structure and lower conduction resistance, but requires a higher gate drive voltage, making it unsuitable for designs with gate signals below 4.5V.

  • Directly recommended by the manufacturer as a modern substitute
  • Active lifecycle status with excellent stock levels
  • Slightly lower Rds(on) (45mOhm vs 50mOhm) and higher continuous drain current (4.3A vs 4A)
  • Higher gate threshold voltage (2.2V vs 1.3V) prevents low-voltage 2.5V gate drive operation
  • Slightly higher gate charge (23nC vs 14nC) may slow down switching times in high-frequency applications
Lifecycle StatusUnknownActiveActive
Market AvailabilityNon-stockIn stockIn stock
REACHUnknownREACHREACH
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