Alpha & Omega Semiconductor Inc. AON6424

Overview

AON6424 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) < 5.0 mΩ at V_GS = 10 V and < 8.5 mΩ at V_GS = 4.5 V, supporting 68 A continuous drain current and 170 A pulsed current in server POL and telecom isolated converters.

For engineers reviewing the AON6424 datasheet, pinout, applications, or equivalent options, key selection criteria include low gate charge (Q_g = 17–23 nC @ 10 V), fast switching (t_r = 4.5 ns, t_f = 4.5 ns), robust UIS rating, and thermal performance with R_θJC = 3.5 °C/W.

Technical Context

This device employs AlphaMOS LV trench technology to achieve ultra-low on-resistance at logic-level gate drive, enabling high-current synchronous rectification in compact 5×6 mm² surface-mount packages. Its low Q_gd/Q_g ratio (≈0.17) and Crss of 92 pF support stable high-frequency operation up to 1 MHz in buck converters.

The integrated body diode features fast reverse recovery (t_rr = 12 ns, Q_rr = 16.8 nC) and low forward voltage (V_SD = 0.7–1.0 V), reducing conduction loss and shoot-through risk in half-bridge topologies. All units undergo 100% UIS and gate resistance testing per production lot.

Key Specifications

Pinout & Package

Package: DFN5x6 (5.0 mm × 6.0 mm × 0.95 mm), exposed drain pad on bottom side for optimal thermal conduction and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRLHS6342 and SiR872DP, the AON6424 delivers best-in-class balance of low R_DS(ON), low Q_g, and superior thermal resistance in a compact DFN5x6, making it optimal for space-constrained, high-frequency, high-current DC/DC designs where layout flexibility is limited.

Availability

AON6424 is available at Aetrix Electronics and suitable for server point-of-load converters, telecom isolated DC/DC modules, and industrial motor drive half-bridges requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AON6424 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 targets high-efficiency, high-current power conversion with trench-based silicon optimized for logic-level drive and low-loss operation below 40 V.

FAQ

What is the maximum continuous drain current rating for AON6424 at 100°C case temperature?

The AON6424 supports 17 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limits of the DFN5x6 package and must be validated with actual PCB copper area and airflow conditions. The AON6424 maintains stable R_DS(ON) performance across this range due to its low thermal resistance and positive temperature coefficient.

Does AON6424 support 3.3 V gate drive in practical applications?

The AON6424 has a gate threshold voltage (V_GS(th)) of 1.3–2.3 V, but its 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 (>20 mΩ), leading to excessive conduction loss and thermal runaway risk. The AON6424 is designed for 4.5 V or 5 V gate drive, not 3.3 V logic levels.

How is the AON6424 qualified for reliability in high-reliability power systems?

The AON6424 undergoes 100% unclamped inductive switching (UIS) and gate resistance (R_g) testing per production lot, ensuring robustness against real-world fault conditions. It meets AEC-Q101 stress test requirements for HTRB, HTGB, and TC, and is rated for TJ = −55 °C to +150 °C operation. The AON6424 is not qualified for automotive safety-critical systems but is widely deployed in industrial and telecom infrastructure.

Can AON6424 be used in parallel configurations for higher current handling?

Yes, the AON6424 supports paralleling due to its positive temperature coefficient of R_DS(ON), which promotes current sharing across multiple devices. Successful implementation requires matched gate drive paths, symmetrical PCB layout, and shared thermal interface. The AON6424's low Q_g and tight V_GS(th) distribution (1.3–2.3 V) further enhance stability in parallel operation without external current-sharing resistors.

What is the recommended PCB layout practice for the exposed drain pad of AON6424?

The AON6424's exposed drain pad must be soldered to a minimum 2-layer, 2 oz. copper thermal pad with ≥8 thermal vias (0.3 mm diameter) connecting to inner ground or power planes. Avoid solder mask over the pad. For optimal thermal performance, the AON6424's R_θJC = 3.5 °C/W assumes full pad coverage and proper via placement-failure to implement this reduces power handling by up to 40%.