Alpha & Omega Semiconductor Inc. AOY66923

Overview

AOY66923 from Alpha & Omega Semiconductor is a 100V N-Channel Trench Power MOSFET using AlphaSGT™ technology, optimized for high-frequency switching and synchronous rectification. It delivers 58A continuous drain current at V_GS=10V, <11mΩ R_DS(ON) at 10V, and <15mΩ at 4.5V, enabling efficient operation in DC-DC converters and motor drives.

For engineers reviewing the AOY66923 datasheet, pinout, applications, or equivalent options, key selection criteria include its logic-level gate drive capability (V_GS(th) = 1.6–2.6V), low Q_g×R_DS(ON) figure-of-merit, 100% UIS-tested ruggedness, and TO-251B package thermal performance.

Technical Context

The AOY66923 employs AlphaSGT™ superjunction trench technology to achieve low conduction loss and fast switching. Its gate threshold voltage (1.6–2.6V) ensures reliable turn-on with 3.3V/5V logic controllers, while its 0.3–1.3Ω gate resistance supports controlled dV/dt and EMI management.

Designed for unclamped inductive switching (UIS) stress, it sustains 130A pulsed drain current and 45mJ avalanche energy (L=0.1mH). Thermal design leverages 1.7°C/W junction-to-case resistance and 50°C/W junction-to-ambient rating on standard FR-4 PCBs.

Key Specifications

Pinout & Package

AOY66923 uses the TO-251B (IPAK short lead) package - a surface-mount variant of TO-251 with gull-wing leads, optimized for automated assembly and moderate-power thermal performance. The package features isolated drain tab for simplified heatsinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRF540N and SiR872DP, AOY66923 uniquely combines TO-251B's mountable drain tab, logic-level drive, and sub-12mΩ R_DS(ON) - making it optimal for thermally demanding, medium-power industrial and telecom applications where both efficiency and manufacturability matter.

Availability

AOY66923 is available at Aetrix Electronics and suitable for server VRMs, industrial motor drives, telecom DC-DC converters, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for AOY66923 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, industrial, and automotive markets.

The AOY66923 belongs to AOS' AlphaSGT™ trench MOSFET product line, engineered specifically for high-efficiency, high-frequency power conversion where low R_DS(ON), fast switching, and ruggedness are critical.

FAQ

What is the maximum continuous drain current for AOY66923 at 100°C case temperature?

The AOY66923 supports 30A continuous drain current at T_C = 100°C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limits under steady-state conditions with proper heatsinking. At lower case temperatures (e.g., 25°C), AOY66923 delivers up to 58A. Designers must verify actual board-level thermal resistance to ensure junction temperature remains ≤150°C.

Does AOY66923 support logic-level gate drive from a 3.3V microcontroller?

Yes, AOY66923 supports logic-level gate drive: its gate threshold voltage V_GS(th) is specified from 1.6V to 2.6V at 250μA, ensuring reliable turn-on with 3.3V outputs. However, full enhancement (to achieve <15mΩ R_DS(ON)) requires ≥4.5V gate drive. For robust 3.3V-only operation, external gate boosting or level-shifting is recommended.

What does "100% UIS tested" mean for AOY66923?

"100% UIS tested" means every AOY66923 unit undergoes unclamped inductive switching validation per JEDEC JESD22-A110. Each device is stressed with a defined inductive load (L = 0.1mH) and current pulse to verify it can safely absorb 45mJ avalanche energy without failure. This ensures field reliability in motor drive and SMPS applications with inductive transients.

Can AOY66923 be used in synchronous rectification topologies?

Yes, AOY66923 is explicitly qualified for synchronous rectification, as stated in its Product Summary. Its low R_DS(ON), fast switching parameters (t_r = 3ns, t_f = 3.5ns), and low Q_gd/Q_gs ratio minimize shoot-through risk and conduction loss in LLC and phase-shifted full-bridge converters operating up to several hundred kHz.

What is the thermal resistance from junction to ambient (R_θJA) for AOY66923 on a standard PCB?

The AOY66923 has an R_θJA of 50°C/W when mounted on a 1in² FR-4 board with 2oz copper in still air (TA = 25°C), per its datasheet test condition. This value assumes minimal copper area beyond the pad. Real-world R_θJA improves significantly with added thermal vias and copper pour - designers should use the 1.7°C/W R_θJC value when heatsinking the drain tab directly.