Alpha & Omega Semiconductor Inc. AO7407

Overview

AO7407 from Alpha & Omega Semiconductor is a 20V P-Channel MOSFET using advanced trench technology, optimized for low-voltage load switching and PWM control with R_DS(ON) < 135 mΩ at V_GS = −4.5 V, 1.2 A continuous drain current, and 1.8 V logic-level gate drive capability. It operates as a high-side or low-side switch in portable power management circuits.

For engineers reviewing the AO7407 datasheet, pinout, applications, or equivalent options, key selection criteria include its 20 V V_DS, sub-2.5 V gate threshold, SC-70 package thermal performance, and body diode recovery characteristics for synchronous buck or battery protection designs.

Technical Context

The AO7407 implements a trench-gate P-channel structure enabling enhanced channel density and reduced specific on-resistance. Its gate threshold voltage (−0.4 to −1.0 V) ensures reliable turn-on with 1.8–2.5 V microcontroller outputs, while low Q_g (8.5–11 nC) supports high-frequency PWM operation up to several hundred kHz.

Thermal design relies on junction-to-lead resistance of 0.63 °C/W and junction-to-ambient rating of 220 °C/W (1 in² FR-4, 2 oz Cu), with SOA limited by R_DS(ON) at DC and pulse width at higher currents. The integrated body diode exhibits t_rr = 37–49 ns and Q_rr = 27 nC under IF = −1.2 A, dI/dt = 100 A/μs conditions.

Key Specifications

Pinout & Package

AO7407 is housed in an SC-70 (SOT-323) surface-mount package with three terminals: Drain (D), Gate (G), and Source (S). The package measures 2.0 × 2.1 × 0.9 mm and features gull-wing leads compatible with standard reflow profiles.

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 AO7407 delivers balanced trade-offs: wider V_GS(th) range for margin against gate noise, moderate Q_g for general-purpose PWM, and proven SC-70 reliability in consumer battery applications - making it optimal for cost-sensitive, thermally constrained designs requiring guaranteed 1.8 V turn-on.

Availability

AO7407 is available at Aetrix Electronics and suitable for USB power delivery, Li-ion battery protection, white LED dimming, and low-voltage logic interface applications requiring stable component supply and consistent SC-70 packaging.

Supply support for AO7407 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-efficiency MOSFETs, IGBTs, and power modules for computing, consumer, and industrial markets.

The AO7407 belongs to AOS's logic-level P-Channel trench MOSFET product line, engineered specifically for space-constrained, low-voltage load switching where gate drive headroom is limited and thermal dissipation must be minimized.

FAQ

What is the maximum continuous drain current for AO7407 at 70°C ambient temperature?

The AO7407 supports −1.0 A continuous drain current at T_A = 70°C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limitations of the SC-70 package under still-air conditions. At higher board copper coverage or forced airflow, the AO7407 may sustain higher current, but design validation must confirm junction temperature remains below 150°C. Always reference the SOA curve in Figure 9 of the AO7407 datasheet for pulse-width-dependent limits.

Does AO7407 have a built-in body diode, and what are its key parameters?

Yes, the AO7407 integrates a parasitic body diode with forward voltage V_SD = −0.7 to −1.0 V at I_S = −1 A and reverse recovery time t_rr = 37–49 ns at dI/dt = 100 A/μs. These values are measured under standardized test conditions and define the diode's conduction loss and switching behavior in synchronous rectifier or flyback topologies. The AO7407 body diode is not rated for avalanche energy and should not be used in unclamped inductive switching without external clamping.

Can AO7407 be used as a high-side switch with a 3.3 V microcontroller GPIO?

Yes, the AO7407 can function as a high-side switch driven directly by a 3.3 V microcontroller GPIO when configured with appropriate level-referenced gate control. Since it is a P-Channel device, the gate must be pulled low relative to the source (i.e., V_GS ≤ −1.8 V) to turn on. A simple resistor divider or dedicated high-side driver ensures proper V_GS swing. The AO7407's −0.4 to −1.0 V V_GS(th) guarantees strong enhancement even with marginal gate drive, making it suitable for such implementations.

What is the thermal resistance from junction to ambient (R_θJA) for AO7407 on a standard PCB?

The AO7407 has a typical R_θJA of 220 °C/W when mounted on a 1 in² FR-4 board with 2 oz copper in still air, per the manufacturer's test condition. This value assumes no additional thermal vias or heatsinking. In practice, adding thermal vias under the exposed pad (if present) or increasing copper area can reduce R_θJA significantly. The AO7407 datasheet also specifies R_θJL = 0.63 °C/W, indicating efficient heat transfer to the PCB lead frame - a key advantage for compact layouts.

Is AO7407 RoHS compliant and halogen-free?

Yes, the AO7407 is RoHS compliant and halogen-free, meeting JEDEC J-STD-609 Category 1 (Br, Cl < 900 ppm) and EU Directive 2011/65/EU requirements. This compliance is confirmed in AOS's official product change notices and material declarations. The AO7407 is suitable for use in consumer, industrial, and medical electronics where environmental regulations apply, and no exemptions are required for its standard packaging or process flow.