Alpha & Omega Semiconductor Inc. AO6403

Overview

AO6403 from Alpha & Omega Semiconductor is a 30V P-Channel enhancement-mode MOSFET using advanced trench technology, with R_DS(ON) < 35 mΩ at V_GS = −10 V and < 58 mΩ at V_GS = −4.5 V, −6 A continuous drain current, and ultra-low gate charge (Q_g = 13.6–16 nC). It serves as a high-efficiency load switch or PWM-controlled power stage in DC-DC converters and battery protection circuits.

For engineers reviewing the AO6403 datasheet, pinout, applications, or equivalent options, key selection considerations include its TSOP-6 package, −30 V V_DS rating, body diode recovery performance (t_rr = 15 ns, Q_rr = 9.7 nC), thermal resistance (R_θJA = 110 °C/W), and gate threshold voltage range (−1.3 to −2.4 V).

Technical Context

The AO6403 is a single P-channel MOSFET optimized for low-voltage, high-current switching in compact space-constrained applications. Its trench-gate structure delivers low on-resistance and fast switching with minimal gate drive requirements, supporting operation down to V_GS = −4.5 V for logic-level compatibility.

Thermal design relies on its junction-to-ambient R_θJA of 110 °C/W (1 in² FR-4, 2 oz Cu) and maximum junction temperature of 150 °C. The device features a robust body diode with reverse recovery time of 15 ns and charge of 9.7 nC under IF = −6 A, dI/dt = 100 A/μs conditions.

Key Specifications

Pinout & Package

AO6403 is housed in a surface-mount TSOP-6 package (3.05 mm × 1.6 mm × 0.95 mm), optimized for automated assembly and thermal performance via exposed drain pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si2301DDS and DMG2305UVT, the AO6403 provides superior conduction efficiency at −6 A due to its lower R_DS(ON) and higher −30 V rating, while its TSOP-6 package offers better thermal management than SOT-23 alternatives-making it optimal for sustained 2–6 A loads in 12–24 V industrial and portable systems.

Availability

AO6403 is available at Aetrix Electronics and suitable for battery protection circuits, USB-C power delivery switches, and DC-DC synchronous buck converters requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for AO6403 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 AO6403 belongs to AOS's TrenchMOS™ P-Channel portfolio, engineered specifically for high-efficiency, low-voltage power switching in space- and thermally-constrained applications such as portable electronics and distributed power systems.

FAQ

What is the maximum continuous drain current rating for the AO6403?

The AO6403 has a continuous drain current (I_D) rating of −6 A at T_A = 70 °C with standard PCB mounting. At T_A = 25 °C, the steady-state rating remains −6 A, limited by package thermal resistance and junction temperature cap of 150 °C. Derating applies above 70 °C ambient per the R_θJA curve in the datasheet. The AO6403 must be used within these limits to ensure reliable long-term operation.

Does the AO6403 support logic-level gate drive?

Yes, the AO6403 supports logic-level gate drive with guaranteed R_DS(ON) < 58 mΩ at V_GS = −4.5 V and I_D = −5 A. Its gate threshold voltage (V_GS(th)) ranges from −1.3 V to −2.4 V, ensuring full enhancement with standard 5 V or 4.5 V microcontroller outputs. This eliminates the need for gate driver ICs in many low-to-moderate power applications, simplifying design and reducing BOM count for the AO6403.

What is the body diode reverse recovery performance of the AO6403?

The AO6403 body diode exhibits t_rr = 15 ns and Q_rr = 9.7 nC under IF = −6 A and dI/dt = 100 A/μs conditions. These values are measured and specified in the official datasheet and confirm suitability for synchronous rectification in buck converters. The fast recovery minimizes voltage overshoot and cross-conduction loss-critical for stable, high-efficiency operation of the AO6403 in hard-switched topologies.

Can the AO6403 be used in high-frequency PWM applications?

Yes, the AO6403 is well-suited for high-frequency PWM applications due to its low total gate charge (Q_g = 13.6–16 nC), fast switching times (t_d(on) = 8 ns, t_r = 6 ns, t_d(off) = 17 ns, t_f = 5 ns), and low output capacitance (C_oss = 140 pF). These parameters enable clean, low-loss switching at frequencies exceeding 1 MHz when paired with appropriate gate drive strength-making the AO6403 effective in compact DC-DC modules and LED drivers.

What is the thermal resistance (R_θJA) of the AO6403 under standard test conditions?

The AO6403 has a junction-to-ambient thermal resistance (R_θJA) of 110 °C/W when mounted on a 1 in² FR-4 board with 2 oz copper in still air (T_A = 25 °C). This value assumes no additional heatsinking and reflects worst-case PCB layout. In practice, adding thermal vias to the exposed drain pad can reduce effective R_θJA by 20–30%. The AO6403's thermal performance directly determines its usable power envelope in real-world designs.