Alpha & Omega Semiconductor Inc. AO4264

Overview

AO4264 from Alpha & Omega Semiconductor is a dual N-channel MOSFET in SO-8 package, rated for 60 V V_DS, 11 A continuous drain current per channel at T_C = 25°C, and 19 mΩ typical R_DS(on) at V_GS = 10 V. It serves as a synchronous rectifier and load switch in DC-DC converters for telecom and server power supplies.

For engineers reviewing the AO4264 datasheet, pinout, applications, or equivalent options, key selection criteria include dual-channel integration, low conduction loss at 10 V gate drive, thermal performance in SO-8, and halogen-free compliance status per AOS Green Policy.

Technical Context

The AO4264 integrates two matched N-channel enhancement-mode MOSFETs in a single SO-8 thermally enhanced package. Each channel features a 60 V breakdown voltage and supports logic-level gate drive down to 4.5 V, enabling direct interface with PWM controllers in high-frequency synchronous buck stages.

Its dual-die construction provides tightly coupled thermal behavior and matched on-resistance between channels, critical for current-sharing accuracy in paralleled output stages and bidirectional switching topologies such as OR-ing controllers.

Key Specifications

Pinout & Package

AO4264 uses an SO-8 surface-mount package with exposed drain pad (pin 1–4 = Source 1, Gate 1, Drain 1, Drain 1; pin 5–8 = Drain 2, Drain 2, Gate 2, Source 2), supporting dual independent channel routing and thermal coupling to PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si7850DP-T1-GE3 and IRF7341TRPBF, the AO4264 delivers optimal balance of current capability, thermal management via exposed pad, and verified halogen-free compliance-making it preferred for high-reliability telecom and server power where layout reuse and environmental certification matter.

Availability

AO4264 is available at Aetrix Electronics and suitable for telecom DC-DC converters, server VRMs, and industrial PoL modules requiring stable component supply, halogen-free compliance, and SO-8 thermal performance.

Supply support for AO4264 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-efficiency MOSFETs, IGBTs, and power modules for computing, consumer, and industrial markets.

The AO4264 belongs to AOS's dual-MOSFET product line designed specifically for high-density, high-efficiency DC-DC conversion in space-constrained power systems where thermal management and green compliance are mandatory.

FAQ

What is the maximum junction temperature rating for AO4264?

The AO4264 has a maximum junction temperature (T_J) rating of 150°C per its official datasheet. This allows reliable operation in high-ambient environments such as enclosed telecom chassis or server racks. Derating curves specify that continuous drain current drops to ~7.5 A per channel at T_C = 100°C, ensuring safe thermal margins when the AO4264 is mounted on 1-in² 2-oz copper with 1 oz internal planes.

Does AO4264 support logic-level gate drive?

Yes, the AO4264 is fully characterized for logic-level operation: R_DS(on) is 28 mΩ typical at V_GS = 4.5 V, enabling direct drive from 3.3 V or 5 V PWM controllers without gate boosting. This feature simplifies gate driver design in compact AO4264-based converters and reduces component count versus higher-threshold alternatives.

Is AO4264 halogen-free and RoHS compliant?

Yes, AO4264 is halogen-free per AOS Green Policy (Br < 900 ppm, Cl < 900 ppm, total Br+Cl < 1500 ppm) and fully RoHS compliant. It contains no brominated flame retardants and uses green molding compounds qualified to IPC-4101D/21. No "L" suffix is required-the AO4264 part number itself denotes the halogen-free version.

What is the thermal resistance from junction to board (R_θJB) for AO4264?

The AO4264 exhibits a junction-to-board thermal resistance (R_θJB) of 45°C/W when soldered to a standard 1-in² copper pad on the top layer with two internal ground planes. This value is measured per JEDEC JESD51-8 and enables the AO4264 to sustain 11 A per channel at T_C = 25°C without additional heatsinking in well-ventilated systems.

Can AO4264 be used in back-to-back configuration for reverse current blocking?

Yes, the AO4264 is commonly deployed in back-to-back configuration for OR-ing and hot-swap applications. Its matched dual-channel structure ensures symmetrical forward voltage drop and eliminates current imbalance. When driven by a dedicated OR-ing controller like the LM5050, the AO4264 blocks reverse current effectively while maintaining low conduction loss during normal operation.