Alpha & Omega Semiconductor Inc. AON6284A

Overview

AON6284A from Alpha & Omega Semiconductor is an 80V N-channel Trench Power MOSFET using AlphaSGT™ technology, optimized for high-efficiency synchronous rectification in AC/DC adapters and Quick Charge 3.0 power supplies. It delivers 48A continuous drain current at V_GS=10V, with R_DS(ON) < 6.5mΩ (10V) and < 8.5mΩ (4.5V), enabling logic-level gate drive and low conduction loss in compact DFN5x6 packages.

For engineers reviewing the AON6284A datasheet, pinout, applications, or equivalent options, key selection criteria include its 80V V_DS, 48A I_D, 1.3–2.3V gate threshold, 36–52nC total gate charge, and 2.2°C/W junction-to-case thermal resistance - all critical for thermally constrained, high-frequency switching designs.

Technical Context

The AON6284A employs AlphaSGT™ trench-gate silicon technology to achieve low R_DS(ON) while maintaining robust avalanche capability (E_AS = 80mJ) and 100% UIS testing. Its gate threshold voltage (1.3–2.3V) ensures reliable turn-on with standard logic-level drivers, and its low Q_g(4.5V)=16.5–25nC supports fast switching with reduced driver loss.

Thermally, the device features a DFN5x6 package with exposed drain pad, delivering 2.2°C/W R_θJC and enabling high-power density layouts. Its body diode exhibits V_SD=0.68–1.0V at I_S=1A and t_rr=23ns with Q_rr=91nC, supporting efficient reverse recovery in synchronous rectifier topologies.

Key Specifications

Pinout & Package

Package: DFN5x6 (Dual Flat No-lead, 5mm × 6mm, 8-pin, exposed drain pad). Thermal performance relies on soldering the bottom-side drain pad to ≥1in² 2oz copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IPP040N08N and SiR626DP, the AON6284A offers superior power density (5×6mm vs. TO-252/SO-8), lower thermal resistance (2.2°C/W vs. ≥3.5°C/W), and tighter gate threshold (1.3–2.3V vs. 2.0–4.0V), making it optimal for compact, high-frequency, logic-driven synchronous rectifier designs.

Availability

AON6284A is available at Aetrix Electronics and suitable for USB PD 3.0 quick chargers, AC/DC adapter secondary rectification, and DC/DC brick power supplies requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for AON6284A 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 modules for computing, consumer, industrial, and automotive markets.

The AON6284A belongs to AOS' AlphaSGT™ family of low-voltage, high-current MOSFETs engineered specifically for high-efficiency, high-density synchronous rectification in USB PD, adapter, and server power applications.

FAQ

What is the maximum continuous drain current rating for AON6284A at 100°C case temperature?

The AON6284A supports 48A continuous drain current at T_C = 100°C under steady-state conditions, as specified in the Absolute Maximum Ratings table. This rating assumes proper PCB thermal design with ≥1in² 2oz copper connected to the exposed drain pad. Derating applies above 100°C case temperature per Figure 13 in the datasheet. The AON6284A's 48A rating enables high-current secondary-side rectification without external heatsinks in space-constrained adapters.

Does AON6284A support logic-level gate drive, and what is its gate threshold voltage range?

Yes, the AON6284A supports logic-level gate drive with a guaranteed gate threshold voltage (V_GS(th)) range of 1.3V to 2.3V at T_J = 25°C. This allows full enhancement using standard 3.3V or 5V controller outputs without gate driver ICs. The AON6284A maintains usable R_DS(ON) < 8.5mΩ at V_GS = 4.5V, making it ideal for synchronous rectifier ICs like MP6908 and SR087 that provide native 5V gate drive.

What thermal resistance values are specified for AON6284A, and how do they impact PCB layout?

The AON6284A specifies R_θJC = 2.2°C/W (junction-to-case) and R_θJA = 55°C/W (junction-to-ambient, on 1in² FR-4). The low R_θJC means effective thermal management depends critically on soldering the exposed drain pad to a large copper pour. Layout must use ≥8 thermal vias (0.3mm diameter) under the pad, connected to internal ground or power planes. The AON6284A's thermal performance directly determines achievable power density in USB PD brick designs.

Is AON6284A suitable for unclamped inductive switching (UIS) applications, and what is its rated avalanche energy?

Yes, the AON6284A is 100% UIS tested with a rated single-pulse avalanche energy (E_AS) of 80mJ at T_J = 25°C. This ruggedness is validated per JEDEC JESD24-11 and supports reliable operation in flyback converters subject to transformer leakage energy. The AON6284A's UIS capability eliminates the need for external RC snubbers in many adapter designs, reducing BOM cost and improving reliability. Always verify operating conditions against the SOA curve in Figure 9.

What are the key switching parameters of AON6284A, and how do they affect high-frequency operation?

The AON6284A features t_d(on) = 7.5ns, t_r = 4ns, t_d(off) = 32ns, and t_f = 6ns at V_GS = 10V, V_DS = 40V, and R_GEN = 3Ω. Its low Q_gd = 6nC and Cr_ss = 18.5pF minimize Miller effect, enabling stable operation up to 500kHz in QR flyback topologies. These parameters make the AON6284A especially effective in high-frequency, high-efficiency USB PD 3.0 designs where switching loss dominates total loss.