Alpha & Omega Semiconductor Inc. AO7405

Overview

AO7405 from Alpha & Omega Semiconductor is a 30V P-Channel MOSFET using advanced trench technology, delivering R_DS(ON) < 115 mΩ at V_GS = −10 V, < 140 mΩ at −4.5 V, and < 200 mΩ at −2.5 V, with continuous drain current of −1.4 A at T_A = 25°C. It serves as a low-voltage load switch in compact space-constrained applications such as portable power management and battery protection circuits.

For engineers reviewing the AO7405 datasheet, pinout, applications, or equivalent options, key selection criteria include gate-threshold voltage (−0.6 to −1.4 V), ultra-low gate charge (Q_g(10V) = 5.9–7.2 nC), body-diode forward voltage (−0.78 to −1.0 V), and SOT363 (SC70-6L) package thermal resistance (R_θJA = 425°C/W).

Technical Context

The AO7405 operates as a single P-channel enhancement-mode MOSFET with gate threshold voltage ranging from −0.6 V to −1.4 V, enabling logic-level drive down to 2.5 V. Its trench-based silicon structure yields low input capacitance (C_iss = 260–315 pF) and fast switching performance, including t_D(on) = 6 ns and t_f = 5 ns under standard test conditions.

Thermally, the device features a junction-to-ambient thermal resistance of 425°C/W on a 1-in² FR-4 board with 2 oz copper, and maximum junction temperature of 150°C. Its safe operating area supports unclamped inductive switching with energy rating defined by BVDSS = −30 V and I_AR = −10 A.

Key Specifications

Pinout & Package

The AO7405 is housed in a surface-mount SC70-6L (SOT363) package with 0.65 mm pitch, optimized for high-density PCB layouts and automated assembly. Thermal performance relies on exposed leadframe design and solderable terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMG3415L-7 and SI2301-DS, the AO7405 delivers optimal balance of low gate charge (6.5 nC), compact SOT363 footprint, and guaranteed −2.5 V turn-on-making it uniquely suited for space-constrained, battery-operated systems demanding both efficiency and responsiveness.

Availability

AO7405 is available at Aetrix Electronics and suitable for battery protection circuits, USB power switches, low-current inverters, and low-power DC-DC converters requiring stable component supply across production lifecycles.

Supply support for AO7405 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, industrial, and automotive markets.

The AO7405 belongs to AOS's logic-level P-channel trench MOSFET product line, engineered specifically for space- and efficiency-critical load switching in portable and battery-powered electronics.

FAQ

What is the maximum continuous drain current for AO7405 at 70°C ambient temperature?

The AO7405 supports −1.0 A continuous drain current at T_A = 70°C, derated from −1.4 A at 25°C due to thermal limitations. This value reflects steady-state operation on a standard 1-in² FR-4 board with 2 oz copper, and must be validated against actual board layout and airflow conditions. The AO7405 datasheet specifies this rating explicitly in its Absolute Maximum Ratings table.

Can AO7405 be driven directly by a 3.3 V microcontroller GPIO?

Yes, the AO7405 can be driven directly by a 3.3 V microcontroller GPIO because its gate threshold voltage (V_GS(th)) ranges from −0.6 V to −1.4 V, and R_DS(ON) remains below 140 mΩ at V_GS = −3.3 V. This ensures full enhancement and low conduction loss without external level-shifting. The AO7405's low gate charge (≈6.5 nC) further minimizes switching delay and driver loading.

What is the body diode forward voltage of AO7405, and how does it affect reverse recovery?

The AO7405 body diode forward voltage (V_SD) is −0.78 V to −1.0 V at −1 A, with reverse recovery time (t_rr) of 11.5–15 ns and reverse recovery charge (Q_rr) of 4.5 nC. These values indicate fast, low-loss recovery behavior suitable for synchronous rectification in high-frequency DC-DC converters. The AO7405's low Q_rr reduces switching loss and EMI compared to standard Schottky diodes in the same application.

Is AO7405 suitable for hot-swap applications in USB Type-A ports?

Yes, the AO7405 is suitable for USB Type-A hot-swap applications due to its fast turn-off fall time (t_f = 5 ns), low gate charge (6.5 nC), and ability to block −30 V. Its SOT363 package allows tight layout near connectors, and its −2.5 V logic compatibility ensures clean enable/disable control from USB power management ICs. The AO7405's robust SOA curve also supports transient overcurrent events typical during plug insertion.

What is the thermal resistance R_θJA of AO7405, and how is it measured?

The AO7405 has a junction-to-ambient thermal resistance (R_θJA) of 425°C/W, measured on a 1-in² FR-4 board with 2 oz copper in still air at T_A = 25°C. This value assumes no additional heatsinking and is highly dependent on PCB copper area and airflow. For accurate thermal design, users must refer to the AO7405's transient thermal impedance curves (Figure 11) and validate against their specific layout, as R_θJA drops significantly with increased copper pour.