Alpha & Omega Semiconductor Inc. AO7404

Overview

AO7404 from Alpha & Omega Semiconductor is a dual N-channel enhancement-mode MOSFET in a 6-pin TSOP-6 package, rated for 30 V V_DS, 3.8 A continuous drain current, and 45 mΩ typical R_DS(on) at V_GS = 10 V. It serves as a synchronous rectifier or load switch in DC-DC converters for portable electronics.

For engineers reviewing the AO7404 datasheet, pinout, applications, or equivalent options, key selection criteria include its low R_DS(on) at 4.5 V gate drive, dual-channel integration for space-constrained buck topologies, and halogen-free TSOP-6 packaging compliant with AOS Green Policy since 2010.

Technical Context

The AO7404 integrates two matched N-channel MOSFETs in a single TSOP-6 die, sharing source terminals to enable synchronous buck converter high-side/low-side operation without external isolation. Its gate threshold voltage (V_GS(th)) ranges from 0.5 V to 1.2 V, supporting logic-level drive from 1.8 V–5 V controllers.

Thermal resistance R_θJA is 90 °C/W (standard PCB layout), and total gate charge Q_g is 5.5 nC at V_GS = 10 V, enabling fast switching with minimal drive power loss in 1–3 MHz DC-DC applications.

Key Specifications

Pinout & Package

AO7404 is housed in a RoHS-compliant, halogen-free TSOP-6 surface-mount package (3.05 mm × 1.65 mm × 0.95 mm), designed for reflow soldering and thermal relief via PCB copper area under the exposed drain pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si2302DS and DMN3026LSD, the AO7404 delivers balanced R_DS(on)/Q_g trade-off for mid-power (2–4 A), high-frequency (1–3 MHz) buck converters where thermal density and gate drive capability are jointly constrained.

Availability

AO7404 is available at Aetrix Electronics and suitable for USB PD adapters, smartphone PMIC stages, industrial sensor nodes, and wireless earbud charging cases requiring stable component supply and halogen-free compliance.

Supply support for AO7404 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, and industrial markets.

The AO7404 belongs to AOS's logic-level dual-N MOSFET product line, engineered for high-efficiency, space-constrained DC-DC conversion in battery-powered and thermally sensitive applications.

FAQ

What is the maximum junction temperature rating for AO7404?

The AO7404 has a maximum rated junction temperature (T_J) of 150 °C. This limit applies under continuous operation with proper PCB thermal design - specifically, ≥1 cm² of 2-oz copper connected to the exposed drain pad. Exceeding this temperature risks parametric shift and long-term reliability degradation. Derating curves in the official AO7404 datasheet define safe operating area boundaries based on ambient temperature and airflow conditions.

Does AO7404 require a gate resistor for stability in 2 MHz switching applications?

Yes, AO7404 benefits from a 5–10 Ω gate resistor in 2 MHz buck converters to dampen ringing caused by PCB trace inductance and device output capacitance (C_oss = 190 pF). Without it, overshoot exceeding 12 V may occur during turn-off, risking gate oxide stress. The resistor value must be selected considering driver strength - AO7404's 5.5 nC Q_g allows full turn-on within 50 ns using a 100 mA capable driver even with 10 Ω series resistance.

Is AO7404 pin-compatible with AO7400 or AO7402?

No, AO7404 is not pin-compatible with AO7400 or AO7402. While all three are dual-N TSOP-6 MOSFETs from AOS, AO7400 uses a common-drain configuration (Pins 3 & 4 = drain), AO7402 uses common-source (Pins 1 & 6 = source), and AO7404 uses shared-source (Pins 1 & 6 = source, Pins 3 & 4 = drain). Swapping them without PCB revision will cause functional failure or shoot-through in synchronous buck topologies.

Can AO7404 be used in reverse-voltage protection circuits?

Yes, AO7404 can implement reverse-polarity protection by connecting Channel 1 as a low-side switch with gate tied to system ground and Channel 2 unused or paralleled. With its 30 V V_DS rating and 65 mΩ R_DS(on) at 4.5 V, it supports ≤3 A loads at <0.2 V dropout. However, body diode conduction during reverse events must be blocked externally - AO7404 lacks integrated reverse-blocking logic, so a series Schottky or additional MOSFET is required for true bidirectional protection.

What halogen-free compliance documentation is available for AO7404?

AO7404 complies with AOS Green Policy halogen-free requirements (Br < 900 ppm, Cl < 900 ppm, total Br+Cl < 1500 ppm) effective 2010, confirmed in AOS's September 2020 Green Policy document. No "L" suffix is used because TSOP-6 was converted to halogen-free prior to 2010. Full material declarations and test reports are available upon request from Aetrix Electronics' technical support team for AO7404 orders.