Alpha & Omega Semiconductor Inc. AON7702

Overview

AON7702 from Alpha & Omega Semiconductor is a 30V N-Channel Trench MOSFET with monolithically integrated Schottky diode, designed for low-side switching in SMPS and load-switching applications. It delivers R_DS(ON) < 9.5 mΩ at V_GS = 10 V, 37 A continuous drain current at T_C = 25°C, and 100% UIS-tested ruggedness.

For engineers reviewing the AON7702 datasheet, pinout, applications, or equivalent options, key selection criteria include its DFN 3×3A package thermal performance (R_θJC = 5.4°C/W), low Q_g(10V) = 17 nC, and body-diode reverse recovery time t_rr = 4–6 ns under 500 A/µs dI/dt.

Technical Context

The AON7702 employs advanced trench-gate process technology to achieve high cell density and low specific on-resistance. Its integrated Schottky diode enables soft-recovery behavior, reducing switching losses and EMI in synchronous buck and OR-ing configurations.

This device operates as a unidirectional low-side switch with gate threshold voltage V_GS(th) = 1.5–2.5 V, rated for ±20 V gate-source voltage, and qualified for consumer-grade operation with TJ range of –55°C to 150°C.

Key Specifications

Pinout & Package

Package: DFN 3×3A (8-pin, exposed drain pad), thermally enhanced surface-mount package with 0.5 mm pitch and bottom-side thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BSC014N04LS6 and Si7850DP, the AON7702 uniquely combines 30 V rating, sub-10 mΩ on-resistance, integrated Schottky diode, and DFN 3×3A footprint-making it optimal for space-constrained, efficiency-critical low-voltage SMPS and load-switch designs where diode integration reduces component count and improves reliability.

Availability

AON7702 is available at Aetrix Electronics and suitable for DC-DC converters, hot-swap load switches, USB-C PD sinks, and industrial LED drivers requiring stable component supply, consistent parametric performance, and long-term production support.

Supply support for AON7702 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 AON7702 belongs to AOS's SRFET™ family of Soft Recovery MOSFETs, engineered specifically to replace discrete MOSFET + Schottky combinations in high-frequency, low-voltage switching applications where diode recovery losses dominate system inefficiency.

FAQ

What is the maximum continuous drain current for AON7702 at 100°C case temperature?

The AON7702 supports 18 A continuous drain current at T_C = 100°C, derated from 37 A at T_C = 25°C per its absolute maximum ratings table. This value reflects package thermal limits and is validated under steady-state conditions with proper PCB copper area and airflow. The AON7702 datasheet specifies this rating explicitly in the "Continuous Drain Current" row under "TC=100°C" condition.

Does AON7702 have a built-in Schottky diode, and how does it affect circuit design?

Yes, the AON7702 integrates a monolithic Schottky diode across source and drain. This eliminates the need for an external freewheeling diode in buck or flyback topologies, reducing BOM count, PCB area, and forward voltage drop (V_SD = 0.4–0.7 V). The AON7702's soft-recovery behavior also suppresses voltage spikes and EMI during diode commutation, simplifying EMI filter design compared to standard MOSFETs.

Can AON7702 be driven directly from a 3.3 V microcontroller GPIO?

Yes, the AON7702 has a gate threshold voltage V_GS(th) of 1.5–2.5 V and R_DS(ON) < 14.5 mΩ at V_GS = 4.5 V, making it compatible with 3.3 V logic drive. However, full enhancement and lowest on-resistance require ≥4.5 V; for 3.3 V-only systems, verify load current stays within the R_DS(ON) vs. V_GS curve at 3.3 V (≈18–22 mΩ) to avoid excessive conduction loss. The AON7702's low Q_g(4.5V) = 7–10.5 nC further eases drive requirements.

What is the thermal resistance from junction to case (R_θJC) for AON7702, and how is it measured?

The AON7702 has R_θJC = 5.4°C/W, measured from junction to the exposed drain pad under standardized test conditions per JEDEC JESD51-1. This value assumes ideal thermal interface between the DFN's bottom copper pad and a large heatsink. In practice, actual thermal performance depends on PCB copper area, solder coverage, and thermal vias beneath the pad. The AON7702's low R_θJC enables >20 W power dissipation with appropriate board-level thermal design.

Is AON7702 suitable for automotive applications?

No, the AON7702 is explicitly qualified for the consumer market only. Its datasheet states: "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 lacks AEC-Q101 qualification, extended temperature screening, or automotive-specific reliability testing. For automotive use, select AOS's AEC-Q101-qualified equivalents such as the AON6254 or AON6290 instead of the AON7702.