Alpha & Omega Semiconductor Inc. AOZ1312EI-1

Overview

AOZ1312EI-1 from Alpha & Omega Semiconductor is a single-channel high-side USB 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, active-high enable logic, and integrated thermal shutdown-designed for controlled hot-swap of USB-powered peripherals in notebook and desktop computers.

For engineers reviewing the AOZ1312EI-1 datasheet, pinout, applications, or equivalent options, this device delivers precise overcurrent protection with deglitched open-drain fault flag, reverse current blocking, and charge-pump gate drive enabling low-voltage operation without external components.

Technical Context

The AOZ1312EI-1 integrates an internal charge pump that drives the N-channel MOSFET gate above VIN, enabling full enhancement down to 2.7 V supply while controlling rise/fall times (0.4–1.5 ms) to suppress inrush surges. Its proprietary driver circuitry ensures stable switching into heavy capacitive loads up to 470 μF.

Overcurrent protection triggers at 1.6–2.7 A with 4–15 ms deglitch timing; thermal shutdown activates at 135 °C with 30 °C hysteresis. The device operates across –40 °C to +85 °C ambient and supports reverse current blocking to isolate downstream loads during disable.

Key Specifications

Pinout & Package

eMSOP-8 package (EPAD MSOP-8) with exposed thermal pad; 3 mm × 3 mm footprint, 0.65 mm pitch, JEDEC MO-187AC compliant; thermal resistance Θ_JA = 60 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB power-switching applications.

Compared with AOZ1312AI-1, the AOZ1312EI-1 offers superior thermal performance in compact layouts; versus TUSB2036IPWR, it provides simpler, lower-cost, higher-efficiency power gating without protocol overhead.

Availability

AOZ1312EI-1 is available at Aetrix Electronics and suitable for notebook computers, desktop motherboards, and industrial USB I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AOZ1312EI-1 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 for power management.

The AOZ1312EI-1 belongs to AOS's single-channel power-distribution switch family, engineered specifically for robust USB hot-swap and load-switching applications in computing and industrial platforms.

FAQ

What is the maximum continuous current rating for the AOZ1312EI-1?

The AOZ1312EI-1 is rated for 1.5 A maximum continuous current under recommended operating conditions (T_A ≤ +85 °C, proper PCB layout). This rating assumes use of the eMSOP-8 package with adequate copper area for thermal dissipation. At higher ambient temperatures or with reduced copper, derating applies per the Θ_JA = 60 °C/W specification.

Does the AOZ1312EI-1 support reverse current blocking?

Yes, the AOZ1312EI-1 provides reverse current blocking when disabled. With the power switch turned off, it prevents current flow from the OUT pins back to the IN pins-critical for isolating downstream loads and avoiding backfeed into shared power rails. This function is inherent to its high-side N-channel MOSFET architecture and internal control logic.

What is the purpose of the OC pin on the AOZ1312EI-1?

OC is an open-drain, active-low overcurrent fault flag output on the AOZ1312EI-1. It asserts low when the output current exceeds the 1.6–2.7 A trip threshold and remains asserted until the fault condition clears. Its 4–15 ms deglitch timing prevents false triggering from brief transients, and it requires an external pull-up resistor to interface with microcontroller interrupt or status monitoring circuits.

Can the AOZ1312EI-1 operate from a 2.7 V supply?

Yes, the AOZ1312EI-1 is fully specified to operate from 2.7 V to 5.5 V input voltage. Its internal charge pump enables reliable gate drive of the N-channel MOSFET even at the 2.7 V minimum, ensuring consistent R_DS(ON) and switching behavior without external boost components-making it ideal for battery-backed or low-voltage USB implementations.

How does thermal shutdown work on the AOZ1312EI-1?

The AOZ1312EI-1 features thermal shutdown that activates at 135 °C junction temperature and recovers at 105 °C, providing 30 °C hysteresis. During sustained overload or short-circuit, the device cycles between shutdown and re-enable states to limit average power dissipation and prevent permanent damage-allowing safe, self-limiting operation until the fault is removed.