AOS (Alpha & Omega Semiconductor) is a world-renowned power semiconductor manufacturer specializing in the R&D and production of low/medium-high voltage MOSFETs, DC-DC power management ICs, load switches, DrMOS and other power devices. Its products are widely applied in consumer electronics, laptops, servers, LED lighting, lithium battery equipment, industrial control and other fields. Featuring low on-resistance loss, stable switching performance and comprehensive protection circuits, AOS has become a mainstream brand for hardware engineers to design power supply circuits.
AOS’s product portfolio consists of two core categories: discrete MOSFETs (AO/AOD/AO4 series) and integrated power management ICs (AOZ series). Combined, they can deliver complete solutions for step-down, step-up, load switching and battery protection circuits, with abundant spot inventory and mature supply chains.
These are small-signal MOSFETs housed in tiny SOT23-3 packages. Compact in size, they are ideal for portable devices, LED dimming, low-current load switches and lithium battery protection boards, divided into N-channel and P-channel variants. They are the most widely used general-purpose small-signal MOSFETs on the market.
Available in single or complementary dual configurations within SOIC8 packages, they support higher current loads for DC-DC synchronous rectification, motor drive, high-power LED power supplies and laptop motherboard power rails. Typical models: AO4407A, AO4435, AO4468, AO4606. With low Rds(on) and low heat generation, they fit continuous high-current circuits.
Packaged in TO252 with excellent heat dissipation, these power MOSFETs target industrial power supplies, adapters, EV controllers and high-power fast chargers, with voltage ratings ranging from 30V to 100V and current capacity up to tens of amperes. Typical models: AOD403, AOD407, AOD409, AOD4185, AO4805, widely used for secondary synchronous rectification and high-side switches.
All-in-one DC-DC step-down converters with integrated high-side and low-side MOSFETs, eliminating the need for external discrete power transistors and simplifying PCB layout. Built-in over-current, over-voltage and thermal protection circuits make them suitable for laptops, industrial control boards and monitor power supplies. Popular models in this round: AOZ1280CI, AOZ1282CI, AOZ1284PI, supporting fixed or adjustable output voltages with output current ranging from 2A to 4A, the top choice for compact multi-channel power supply designs.
The below models cover all series with steady channel inventory, frequently selected for component procurement and BOM design: AO3401A, AO3400A, AOZ1282CI, AO3407A, AO3415, AO4407A, AO3401, AOZ1280CI, AOD409, AO3402, AOD403, AOZ1284PI, AOD4185, AO4606, AO3400, AO3416, AO4435, AO3422, AO4468, AO3415A, AOD407, AO4805
AOS provides a complete power solution ecosystem combining discrete MOSFETs and integrated power ICs, covering applications from tiny signal switching to high-power voltage regulation with strong compatibility and abundant alternative options, dominating power circuit designs for consumer and industrial equipment. For parameter comparison, stock status checking and compatible alternative screening of AOS parts, users may leverage the ICGOODFIND component database to quickly complete BOM verification and optimize stocking planning.
