Alpha & Omega Semiconductor Inc. AON2405

Overview

AON2405 from Alpha & Omega Semiconductor is a 20V P-Channel enhancement-mode trench MOSFET in DFN 2×2B package, with R_DS(ON) < 32 mΩ at V_GS = −4.5 V, −8 A continuous drain current, and −32 A pulsed drain rating-designed for high-efficiency load switching and battery protection circuits in portable power management systems.

For engineers reviewing the AON2405 datasheet, pinout, applications, or equivalent options, key selection considerations include its low gate threshold (−0.3 to −0.9 V), fast switching (t_D(on) = 7 ns, t_f = 46 ns), integrated body diode (V_SD = −0.62 V), thermal resistance (R_θJA = 37 °C/W), and DFN 2×2B footprint compatibility with space-constrained PCB layouts.

Technical Context

The AON2405 operates as a single P-Channel silicon MOSFET with trench-gate architecture optimized for low conduction loss and fast turn-on/off transitions. Its gate threshold voltage range (−0.3 to −0.9 V) enables direct logic-level drive from 1.8 V or 2.5 V controllers, while the 13–18 nC total gate charge supports efficient PWM-based switching up to several MHz.

Thermally, it features a junction-to-ambient R_θJA of 37 °C/W on 1 in² FR-4 with 2 oz copper, and a junction-to-case R_θJC of 80 °C/W-enabling stable operation up to 150 °C junction temperature. The device's SOA curve is limited by R_DS(ON) at DC and pulse widths >10 ms, with unclamped inductive switching capability validated per JEDEC standards.

Key Specifications

Pinout & Package

Package: DFN 2×2B (2 mm × 2 mm, 0.65 mm height), bottom-exposed thermal pad, RoHS-compliant, moisture sensitivity level 1 (MSL1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si2301DDS and DMG1012UW, the AON2405 delivers superior R_DS(ON) at low V_GS, tighter V_GS(th) distribution, and lower Q_g-making it optimal for high-efficiency, high-density battery management where conduction loss and thermal headroom are critical.

Availability

AON2405 is available at Aetrix Electronics and suitable for battery protection circuits, USB-C power delivery modules, and power bank load switching applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AON2405 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, industrial, and automotive markets.

The AON2405 belongs to AOS's low-voltage trench MOSFET product line, engineered specifically for compact, high-efficiency power switching in portable and battery-powered systems where low R_DS(ON), fast switching, and thermal efficiency are primary design constraints.

FAQ

What is the maximum continuous drain current rating for the AON2405 at 70°C ambient temperature?

The AON2405 supports −6 A continuous drain current at T_A = 70°C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limitations of the DFN 2×2B package under still-air conditions. At 25°C ambient, the rating increases to −8 A. Designers must verify actual board-level thermal performance using the provided R_θJA = 37 °C/W value and ensure junction temperature remains below 150°C under worst-case load and ambient conditions for the AON2405.

Does the AON2405 have an integrated Schottky body diode?

No, the AON2405 features a standard parasitic body diode inherent to its P-Channel MOSFET structure-not a discrete Schottky diode. Its forward voltage is −0.62 V at −1 A, with reverse recovery charge Q_rr = 4 nC and recovery time t_rr = 15 ns. While not Schottky, this body diode is optimized for low V_F and fast recovery, making it suitable for synchronous rectification and OR-ing applications where the AON2405 is used in back-to-back configuration.

Can the AON2405 be driven directly by a 1.8 V GPIO without a level shifter?

Yes-the AON2405 has a gate threshold voltage range of −0.3 to −0.9 V, and its R_DS(ON) is specified down to V_GS = −1.5 V (< 70 mΩ). A 1.8 V logic-high output (i.e., V_GS ≈ −1.8 V relative to source) fully enhances the device, delivering <56 mΩ on-resistance. This eliminates the need for external level-shifting circuitry in ultra-low-power systems, simplifying design and reducing component count for the AON2405.

What is the recommended PCB layout for thermal management of the AON2405?

The AON2405's DFN 2×2B package includes an exposed drain pad that must be soldered to a minimum 100 mm² copper pour with ≥4 thermal vias (0.3 mm diameter) connecting to inner or bottom-layer ground planes. Per AOS' characterization, the 37 °C/W R_θJA assumes 1 in² FR-4 with 2 oz copper in still air. Reducing thermal resistance further requires increasing copper area and via count-critical for maintaining ≤150°C junction temperature in high-duty-cycle AON2405 applications.

Is the AON2405 suitable for automotive-grade applications?

The AON2405 is not AEC-Q101 qualified and is intended for commercial and industrial applications only. Its operating junction temperature range (−55 to 150°C) meets extended industrial requirements, but it lacks automotive-specific stress testing, failure-in-time (FIT) data, and PPAP documentation. For automotive battery management or infotainment power stages, designers should select AOS's AEC-Q101-qualified equivalents-such as the AON6254-rather than relying on the AON2405 in safety-critical vehicle systems.