Alpha & Omega Semiconductor Inc. AO4701

Overview

AO4701 from Alpha & Omega Semiconductor is a 30V P-Channel MOSFET with integrated Schottky diode in SOIC-8 package, featuring R_DS(ON) < 48 mΩ at V_GS = −10 V, 100% UIS tested, and optimized for bidirectional blocking switch applications in DC-DC converters and load switches.

For engineers reviewing the AO4701 datasheet, pinout, applications, or equivalent options, key selection criteria include its trench-based low-R_DS(ON) performance, integrated Schottky forward voltage (0.5 V @ 1 A), gate charge (7 nC @ 4.5 V), thermal resistance (R_θJA = 90 °C/W), and SOIC-8 leaded package compatibility with standard PCB layouts.

Technical Context

The AO4701 integrates a P-Channel enhancement-mode MOSFET and a monolithically co-packaged Schottky diode in a single SOIC-8 die. Its trench-gate structure enables low on-resistance and fast switching, while the Schottky anode is internally connected to the MOSFET source terminal - enabling synchronous rectification and reverse-polarity protection without external components.

This configuration supports unidirectional current flow through the MOSFET channel and bidirectional conduction via the Schottky path, with body-diode reverse recovery time (t_rr) of 11 ns and Q_rr of 3.5 nC. The device is rated for continuous drain current of −5 A at T_A = 25 °C and avalanche energy E_AS = 18 mJ.

Key Specifications

Pinout & Package

AO4701 is housed in a thermally enhanced SOIC-8 package with exposed drain terminals on pins 1, 2, 3, and 4 (top view) and source/gate connections on pins 5–8. The package supports solder reflow per JEDEC J-STD-020 and provides 31 °C/W junction-to-lead thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si7157DP-T1-GE3 and DMG2305UVT-7, the AO4701 uniquely combines SOIC-8 thermal capability, integrated Schottky, and sub-50 mΩ R_DS(ON) - making it optimal for 5 A bidirectional switching in industrial and automotive power rails where reliability and layout simplicity are prioritized.

Availability

AO4701 is available at Aetrix Electronics and suitable for reverse polarity protection, hot-swap control, OR-ing circuits, and high-current load switching requiring stable component supply and long-term manufacturability.

Supply support for AO4701 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 ICs for computing, consumer, and industrial markets.

The AO4701 belongs to AOS's trench-based P-Channel MOSFET family designed specifically for high-reliability power management in automotive and industrial systems where integrated protection and thermal robustness are essential.

FAQ

What is the maximum continuous drain current for AO4701 at 70 °C ambient temperature?

The AO4701 supports a continuous drain current of −3.2 A at T_A = 70 °C, based on its R_θJA = 90 °C/W and T_J(MAX) = 150 °C rating. This value assumes operation on a 1 in² FR-4 board with 2 oz copper and accounts for thermal derating. At 25 °C ambient, the rating increases to −5 A. The AO4701 datasheet specifies these limits under steady-state conditions with proper PCB copper area for heat dissipation.

Does AO4701 include a body diode, and how does it differ from the integrated Schottky diode?

Yes, the AO4701 has both a parasitic body diode and a monolithically integrated Schottky diode. The body diode is inherent to the MOSFET structure and exhibits slow reverse recovery (t_rr = 11 ns, Q_rr = 3.5 nC). The Schottky diode is separately fabricated and co-packaged, with VF = 0.5 V @ 1 A and zero reverse recovery charge - making it suitable for high-frequency OR-ing and reverse-current paths. The AO4701 leverages both for complementary conduction modes.

Can AO4701 be driven directly by a 3.3 V microcontroller GPIO?

No - the AO4701 is a P-Channel MOSFET with V_GS(th) ranging from −0.5 V to −1.3 V, but its R_DS(ON) is only guaranteed below 48 mΩ when V_GS ≤ −10 V. At 3.3 V logic level, the gate-source voltage would be insufficient to fully enhance the channel, resulting in high conduction loss. A dedicated gate driver or level-shifting circuit is required to apply −10 V to the gate relative to source. This limitation applies specifically to the AO4701 and must be addressed in system-level design.

What is the purpose of the 100% R_g testing performed on AO4701?

The 100% R_g (gate resistance) testing verifies that each AO4701 unit meets the specified gate resistance range of 4–12 Ω. This parameter directly impacts switching speed and EMI behavior: too-low R_g causes excessive dV/dt and ringing; too-high R_g slows turn-on/off and increases switching losses. Screening ensures consistent gate drive timing across production lots - critical for reliable operation in high-frequency DC-DC converters where the AO4701 is commonly deployed.

Is AO4701 qualified for automotive applications?

No - the AO4701 is explicitly qualified for the consumer market only, as stated in its datasheet: "THIS PRODUCT HAS BEEN DESIGNED AND QUALIFIED FOR THE CONSUMER MARKET. APPLICATIONS OR USES AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS ARE NOT AUTHORIZED." It does not meet AEC-Q101 requirements, lacks automotive-grade screening, and carries no PPAP documentation. For automotive use, designers must select AOS's AEC-Q101-qualified equivalents such as the AON6254 or similar.