Alpha & Omega Semiconductor Inc. AOZ1321DI-02

Overview

AOZ1321DI-02 from Alpha & Omega Semiconductor is a single-channel high-side power-distribution switch featuring a 70 mΩ N-channel MOSFET, 1.5 A continuous current rating, 2.7 V to 5.5 V input voltage range, open-drain fault flag with 4–15 ms deglitch, and thermal shutdown protection - designed for USB port power control in notebook computers.

For engineers reviewing the AOZ1321DI-02 datasheet, pinout, applications, or equivalent options, this device supports robust short-circuit and heavy capacitive load handling in space-constrained USB power rail designs requiring active overcurrent monitoring and reverse current blocking.

Technical Context

The AOZ1321DI-02 integrates an internal charge pump enabling gate drive above VIN to fully enhance the N-channel MOSFET, supporting operation down to 2.7 V while controlling rise/fall times (0.4–1.5 ms) to suppress inrush surges. It implements a fixed overcurrent trip threshold of 1.6–2.7 A and uses a dedicated OC pin with deglitched open-drain output.

Thermal shutdown activates at 135 °C with 30 °C hysteresis, and undervoltage lockout disables the switch below 2.12–2.22 V (rising) with 200 mV hysteresis. The enable input accepts TTL/CMOS logic levels and reduces supply current to ≤1 μA when disabled.

Key Specifications

Pinout & Package

eMSOP-8 package with exposed pad (EPAD), 3.0 mm × 3.0 mm footprint, 0.65 mm pitch, and thermal resistance Θ_JA = 60 °C/W - optimized for compact USB hub and docking station layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side load switch applications.

Compared with AOZ1321DI-02, TPS22965DSGR offers lower conduction loss but increases system complexity with external filtering, while AP2172SG-13 sacrifices thermal recovery autonomy for lower unit cost - making AOZ1321DI-02 optimal for designs prioritizing autonomous fault resilience and minimal external components.

Availability

AOZ1321DI-02 is available at Aetrix Electronics and suitable for notebook computers, desktop motherboards, USB docking stations, and industrial peripheral interfaces requiring stable component supply across extended production lifecycles.

Supply support for AOZ1321DI-02 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, power ICs, and advanced packaging technologies for power conversion and distribution.

The AOZ1321DI-02 belongs to AOS's single-channel power-distribution switch product line, engineered specifically for USB and general-purpose load switching applications demanding robust short-circuit tolerance, low quiescent current, and compact eMSOP-8 packaging.

FAQ

What is the maximum continuous current rating for AOZ1321DI-02?

The AOZ1321DI-02 is rated for 1.5 A maximum continuous current under recommended operating conditions (T_A = 25 °C, V_IN = 5.5 V). Derating applies at elevated ambient temperatures or higher R_DS(ON) due to junction heating - full 1.5 A is sustainable in eMSOP-8 packages with adequate PCB copper area per AOS thermal guidelines.

Does AOZ1321DI-02 support reverse current blocking?

Yes, AOZ1321DI-02 provides reverse current blocking with ≤0.2 μA leakage at 25 °C when OUT is biased above IN. This feature prevents backfeed from downstream loads into the upstream supply rail, critical for USB OTG and multi-rail system architectures where power domains may be independently enabled.

What is the function of the OC pin on AOZ1321DI-02?

The OC pin on AOZ1321DI-02 is an open-drain output that asserts low during overcurrent or thermal shutdown events. It incorporates a 4–15 ms deglitch circuit to reject transient spikes, and requires an external pull-up resistor (typically 10 kΩ to 3.3 V or 5 V) to interface with microcontroller interrupt or status monitoring inputs.

Can AOZ1321DI-02 operate from a 3.3 V supply?

Yes, AOZ1321DI-02 operates across 2.7 V to 5.5 V input range, including 3.3 V. At 3.3 V, the internal charge pump maintains sufficient gate drive to achieve specified R_DS(ON) and switching timing, with typical rise time of 0.6–1.0 ms and fall time of 0.05–0.5 ms under 1 μF load conditions.

What package type is used for AOZ1321DI-02?

AOZ1321DI-02 is packaged in eMSOP-8 with exposed pad (EPAD MSOP-8), measuring 3.0 mm × 3.0 mm with 0.65 mm lead pitch. This package delivers Θ_JA = 60 °C/W and supports high-density routing in space-constrained USB interface modules and portable computing platforms.