Alpha & Omega Semiconductor Inc. AO4266E

Overview

AO4266E from Alpha & Omega Semiconductor is a 60V, 11A N-channel Trench Power AlphaSGT™ MOSFET in SO-8 package, featuring <13.5mΩ R_DS(ON) at V_GS=10V, logic-level gate drive (V_GS(th) = 1.2–2.2V), and HBM Class 2 ESD protection. It is designed for high-frequency switching and synchronous rectification in DC-DC converters.

For engineers reviewing the AO4266E datasheet, pinout, applications, or equivalent options, key selection criteria include its low gate charge × R_DS(ON) figure-of-merit (Q_g(10V) = 13.5–20nC), avalanche-rated ruggedness (E_AS = 29mJ), and thermal performance (R_θJA = 75°C/W on 1in² FR-4).

Technical Context

This MOSFET employs AlphaSGT™ trench technology to achieve low conduction loss and fast switching. Its logic-level gate enables direct drive from 3.3V/5V controllers without level-shifting, while integrated body diode with t_rr = 15ns and Q_rr = 45nC supports efficient synchronous rectification.

The device is fully characterized for unclamped inductive switching (100% UIS tested) and gate resistance (100% R_g tested), with absolute maximum ratings including 60V V_DS, ±20V V_GS, and -55°C to +150°C junction temperature range.

Key Specifications

Pinout & Package

SO-8 surface-mount package with exposed drain pad for enhanced thermal dissipation. Pin 1 marked via notch or dot; dual-side thermal path design improves power handling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel MOSFET applications.

Compared with IPP60R190C7 and SI7850DP, the AO4266E delivers optimal trade-off of low R_DS(ON), logic-level compatibility, and minimal Q_g for 60V synchronous rectification - enabling higher efficiency and simpler gate drive in compact DC-DC converters.

Availability

AO4266E is available at Aetrix Electronics and suitable for server VRMs, USB-C PD adapters, and industrial motor drives requiring stable component supply and consistent parametric performance across production lots.

Supply support for AO4266E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-performance MOSFETs, IGBTs, and power ICs for computing, consumer, and industrial markets.

The AO4266E belongs to AOS' AlphaSGT™ logic-level MOSFET product line, engineered specifically for high-frequency, high-efficiency synchronous rectification and DC-DC conversion where low gate charge and rugged avalanche performance are essential.

FAQ

What is the maximum continuous drain current for AO4266E at 100°C case temperature?

The AO4266E supports 11A continuous drain current at T_A = 25°C with V_GS = 10V. At elevated temperatures, derating applies: at T_C = 100°C, the practical continuous current is ~6.5A based on its R_θJA = 75°C/W and T_J(MAX) = 150°C limit. Always verify thermal design using actual board layout and airflow in the AO4266E application.

Does AO4266E have an integrated Schottky body diode?

No, the AO4266E uses a standard silicon body diode inherent to its N-channel MOSFET structure. Its diode has V_SD = 0.72–1.0V at I_S = 1A and exhibits t_rr = 15ns and Q_rr = 45nC - optimized for synchronous rectification but not a Schottky replacement. The AO4266E datasheet does not specify Schottky characteristics.

Can AO4266E be used in a high-side configuration with bootstrap gate drive?

Yes, the AO4266E supports high-side operation with bootstrap gate drive due to its logic-level V_GS(th) (1.2–2.2V) and rated V_GS = ±20V. When used in high-side half-bridges, ensure bootstrap capacitor sizing accounts for Q_g = 13.5–20nC and switching frequency to maintain sufficient V_GS margin above threshold during conduction. This is confirmed in AO4266E application notes for motor control.

Is AO4266E RoHS and halogen-free compliant?

Yes, the AO4266E is explicitly stated as RoHS and halogen-free compliant per its official datasheet Rev.1.1 (August 2023). Compliance covers lead-free solderability, absence of restricted substances (Pb, Cd, Hg, Cr⁶⁺, PBB, PBDE), and zero brominated flame retardants - verified through AOS' material declarations and third-party testing reports.

What is the recommended PCB layout for thermal performance of AO4266E?

For optimal thermal performance, the AO4266E requires a minimum 1in² copper pour connected to its exposed drain pad (Pins 5–8) on the top layer, with ≥4 thermal vias (0.3mm diameter) to inner ground/power planes. AOS specifies R_θJA = 75°C/W measured on 1in² FR-4 with 2oz copper; reducing copper area or omitting vias degrades thermal resistance by 20–40%, directly impacting AO4266E safe operating area.