Alpha & Omega Semiconductor

Alpha & Omega Semiconductor (AOS) specialises in power semiconductors, and the profiles here span its two best-known SOT-23 lines. The AO3400 and AO3400A are 30 V N-channel MOSFETs for load switches, battery protection and compact DC-DC stages - the A code is not a datasheet-identical revision of the base part, and the base AO3400 is obsolete with the AOSS32334C named as its replacement, so check RDS(on) at your actual gate-drive voltage and respect the +/-12 V gate limit on both. The AOZ1282CI adds the EZBuck regulator line: a 36 V, 1.2 A non-synchronous buck in the same SOT-23 outline for cost-sensitive point-of-load rails. AOS ordering codes encode the variant in the suffix, so quote the complete code rather than the family name.

Sourcing notes for Alpha & Omega Semiconductor parts. Always quote the complete manufacturer ordering code — package, temperature grade, speed or accuracy grade, and packing (reel, tube or tray) all change availability and price, and suffixes are where most mismatches happen. Check the lifecycle status on the manufacturer site before committing to a multi-year build; parts flagged not-recommended or obsolete need a last-time-buy plan or a verified alternate lined up early. With every offer, request traceability documents — date code, lot code and original packing — and confirm the inspection steps your supplier applies to high-risk lots.