Alpha & Omega Semiconductor Inc. AO3401AL

Overview

AO3401AL from Alpha & Omega Semiconductor is a P-channel enhancement-mode MOSFET rated for -30 V drain-source voltage, -4.3 A continuous drain current at V_GS = -10 V, and 46 mΩ R_DS(ON) under the same condition. It operates with gate voltages as low as -2.5 V and is optimized for load-switching applications in portable power management circuits.

For engineers reviewing the AO3401AL datasheet, pinout, applications, or equivalent options, key selection considerations include its -30 V V_DS, 46 mΩ R_DS(ON) at -10 V, -2.5 V gate threshold, TO-236 (SOT-23) package, and suitability for low-voltage battery-powered load switching.

Technical Context

This device uses advanced trench MOSFET technology to achieve low on-resistance and low gate charge (9.3 nC typical), enabling efficient switching in high-frequency DC-DC and power-path control circuits. Its gate threshold voltage range of -0.6 V to -1.3 V ensures reliable turn-on with standard logic-level drive.

The AO3401AL features an integrated body diode with 21–28 ns reverse recovery time and 14.3 nC reverse recovery charge under IF = -4.3 A, dI/dt = 100 A/µs conditions - critical for synchronous rectification and bidirectional current handling in compact power rails.

Key Specifications

Pinout & Package

AO3401AL is housed in a TO-236 (SOT-23) plastic surface-mount package with gull-wing leads. The package measures 2.9 mm × 1.3 mm × 1.0 mm and is RoHS compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel MOSFET load-switching applications.

Compared with Si2301DDS and DMG1012UW, the AO3401AL delivers the lowest R_DS(ON) at -4.5 V (55 mΩ) and best gate charge (9.3 nC), making it optimal for thermally constrained, high-efficiency load-switch designs below 4.3 A.

Availability

AO3401AL is available at Aetrix Electronics and suitable for battery load switching, USB power delivery routing, and IoT sensor node power gating requiring stable component supply and halogen-free compliance.

Supply support for AO3401AL 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 AO3401AL belongs to AOS's low-voltage logic-level P-channel MOSFET product line, engineered for compact, high-efficiency load switching in space-constrained portable electronics.

FAQ

What is the maximum continuous drain current rating for AO3401AL at 70°C ambient?

The AO3401AL supports -25 A pulsed drain current but is rated for -4.3 A continuous drain current at T_A = 25°C and -2.5 A at T_A = 70°C per its Absolute Maximum Ratings table. Derating follows the specified thermal resistance (R_θJA = 125 °C/W) and must account for PCB copper area and airflow. The AO3401AL datasheet confirms this limit applies to steady-state operation in standard FR-4 mounting conditions.

Is AO3401AL pin-compatible with AO3401A?

Yes, AO3401AL is electrically identical to AO3401A and shares the same TO-236 (SOT-23) pinout: Source (Pin 1), Gate (Pin 2), Drain (Pin 3). Both parts are drop-in replacements in layout and schematic design. The AO3401AL differs only in being halogen-free, while AO3401A is RoHS-compliant but not halogen-free - a distinction relevant for material declarations, not electrical behavior.

What is the typical gate threshold voltage range for AO3401AL?

The AO3401AL has a gate threshold voltage (V_GS(th)) range of -0.6 V to -1.3 V at I_D = -250 µA, ensuring reliable turn-on with 2.5 V–3.3 V logic signals. This low threshold allows direct interfacing with microcontroller GPIOs without level shifters. The AO3401AL datasheet specifies this range under TJ = 25°C, with slight negative drift at elevated temperatures.

Does AO3401AL include an integrated body diode, and what are its key parameters?

Yes, AO3401AL integrates a body diode with forward voltage V_SD = -0.75 V to -1.0 V at I_S = -1 A and V_GS = 0 V. Its reverse recovery time (t_rr) is 21–28 ns and reverse recovery charge (Q_rr) is 14.3 nC under IF = -4.3 A, dI/dt = 100 A/µs. These values are confirmed in the AO3401AL Electrical Characteristics table and support use in synchronous rectification and OR-ing applications.

What thermal resistance values apply to AO3401AL in a standard PCB layout?

For AO3401AL mounted on a 1 in² FR-4 board with 2 oz copper in still air, R_θJA = 125 °C/W (steady-state) and R_θJL = 43 °C/W (junction-to-lead). R_θJA drops to 80 °C/W for t ≤ 10 s pulses. These values are measured per JEDEC standards and directly impact safe operating area (SOA) calculations. The AO3401AL datasheet provides SOA curves based on these thermal metrics.