Alpha & Omega Semiconductor Inc. AON6528

Overview

AON6528 from Alpha & Omega Semiconductor is a 30V N-Channel enhancement-mode MOSFET in DFN5x6 package, optimized for high-efficiency DC/DC conversion with R_DS(ON) < 6.3 mΩ at V_GS = 10 V and < 9.8 mΩ at V_GS = 4.5 V, supporting continuous drain current up to 30 A at T_A = 25°C, and used in point-of-load regulators for servers and telecom power supplies.

For engineers reviewing the AON6528 datasheet, pinout, applications, or equivalent options, key selection criteria include low gate charge (Q_g = 15.5–22 nC), fast switching (t_r = 3.3 ns, t_f = 4.3 ns), 100% UIS-tested ruggedness, body-diode reverse recovery performance (Q_rr = 17.2 nC), and thermal resistance R_θJC = 5°C/W for heatsink-integrated designs.

Technical Context

The AON6528 employs AlphaMOS LV trench technology to achieve ultra-low on-resistance at logic-level gate drive, enabling efficient operation in 5 V and 3.3 V gate-controlled topologies. Its low Q_g (6.8–10 nC at 4.5 V) and minimal Crss (61 pF) reduce switching losses in high-frequency synchronous buck converters.

Thermally, the device features a copper-exposed DFN5x6 bottom-side thermal pad with R_θJC = 5°C/W, allowing direct PCB copper pour attachment for high-power density designs. It is rated for junction temperatures up to 150°C and supports pulsed drain currents up to 36 A under transient conditions.

Key Specifications

Pinout & Package

Package: DFN5x6 (5.0 mm × 6.0 mm, 1.0 mm height), thermally enhanced with exposed copper drain pad on bottom side. Pin 1 marked by notch or dot; top view shows G-D-S-G pin arrangement (1–4: Gate, Drain, Source, Source).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BSC014N04LS and SiR626DP, the AON6528 offers best-in-class balance of low R_DS(ON) at 4.5 V, moderate Q_g, and proven UIS ruggedness-making it optimal for space-constrained, high-frequency server and telecom POL designs where gate drive voltage may be limited.

Availability

AON6528 is available at Aetrix Electronics and suitable for server point-of-load regulators, telecom isolated DC/DC converters, and industrial motor drive gate drivers requiring stable component supply across long production lifecycles.

Supply support for AON6528 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 AlphaMOS LV product line delivers trench-based N-channel MOSFETs optimized for low-voltage, high-current DC/DC conversion-targeting efficiency, thermal density, and reliability in next-generation power delivery networks.

FAQ

What is the maximum continuous drain current rating for AON6528 at 70°C ambient?

The AON6528 supports 23 A continuous drain current at T_A = 70°C with standard PCB mounting (1 in² FR-4, 2 oz Cu). This derating reflects thermal limits imposed by R_θJA = 64°C/W; using a heatsink or thermal pad improves current capacity. The AON6528 datasheet specifies this value in its Absolute Maximum Ratings table under "Continuous Drain Current, T_A = 70°C".

Does AON6528 support 3.3 V gate drive in practical applications?

The AON6528 has a gate threshold voltage V_GS(th) of 1.4–2.2 V, but R_DS(ON) is not characterized below V_GS = 4.5 V. At 3.3 V, the device operates in linear region with significantly elevated on-resistance-unsuitable for switching applications. The AON6528 is specified and validated for reliable operation only at V_GS ≥ 4.5 V per its Electrical Characteristics table.

What is the significance of 100% UIS testing for AON6528?

100% Unclamped Inductive Switching (UIS) testing certifies that every AON6528 unit can safely absorb 2.6 mJ of avalanche energy without failure. This ensures robustness against voltage overshoot during hard-switching transients in non-synchronous or fault conditions. The AON6528 datasheet confirms this test is performed per JEDEC JESD24-11 on 100% production units.

Can AON6528 be used in parallel configurations?

Yes-the AON6528's positive temperature coefficient for R_DS(ON) (shown in Figure 4) enables inherent current sharing when paralleled. Designers must match gate drive impedance and layout symmetry to minimize dynamic imbalance. The AON6528's low Q_gd/Q_gs ratio further improves paralleling stability by reducing sensitivity to Miller-induced oscillation.

What is the recommended PCB layout practice for thermal management of AON6528?

For optimal thermal performance, the AON6528's exposed drain pad must be soldered to a minimum 1 in² copper pour with ≥6 thermal vias (0.3 mm diameter, spaced ≤2 mm apart) connecting to inner or back-side ground/power planes. The AON6528 datasheet specifies R_θJA = 64°C/W assumes this layout; omitting vias increases junction temperature by >25°C at 20 W dissipation.