Alpha & Omega Semiconductor Inc. AOZ1341EI-1

Overview

AOZ1341EI-1 from Alpha and Omega Semiconductor is a dual-channel high-side power distribution switch with 70 mΩ N-channel MOSFETs, 1 A continuous current per channel, 2.7–5.5 V input voltage range, and active-high enable logic. It integrates internal charge pump gate drive, thermal shutdown, reverse current blocking, and open-drain overcurrent flags-designed for USB port power control in notebook and desktop computers.

For engineers reviewing the AOZ1341EI-1 datasheet, pinout, applications, or equivalent options, key selection criteria include per-channel short-circuit current limit (1.1–1.9 A), deglitched OC flag timing (4–15 ms), rise/fall time control (0.4–1.5 ms), exposed-pad MSOP-8 thermal resistance (60 °C/W), and compatibility with TTL/CMOS logic levels.

Technical Context

The AOZ1341EI-1 implements two independent high-side N-channel MOSFET switches with integrated charge pump gate drivers that operate down to 2.7 V and eliminate external components. Each channel features programmable enable polarity (active-high for AOZ1341EI-1), independent overcurrent detection with 15 ms deglitch, and thermal shutdown at 135 °C with 30 °C hysteresis.

It provides reverse current blocking during disable, <1 μA quiescent supply current when disabled, and controlled output slew rates to suppress inrush surges into heavy capacitive loads (e.g., 100 μF USB downstream ports). The device operates across –40 °C to +85 °C ambient and supports stable current limiting under short-circuit conditions without latch-off.

Key Specifications

Pinout & Package

AOZ1341EI-1 is housed in an Exposed Pad MSOP-8 package (3.0 mm × 3.0 mm × 1.0 mm) with thermal pad on underside for enhanced heat dissipation. Pin 1 is GND; pins 3 and 4 are EN1 and EN2 (active-high); pins 6 and 7 are OUT1 and OUT2; pins 5 and 8 are OC2 and OC1 (open-drain, active-low).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel power distribution switch applications.

Compared with TPS2051BDBVR (single-channel, higher R_DS(ON), no reverse blocking) and TUSB2036IPW (integrated hub IC, not a power switch), AOZ1341EI-1 uniquely delivers dual 1 A high-side switching with independent fault flags, thermal protection, and 70 mΩ performance in a thermally optimized MSOP-8 package.

Availability

AOZ1341EI-1 is available at Aetrix Electronics and suitable for notebook computers, desktop motherboards, and self-powered USB hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AOZ1341EI-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 and Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, power ICs, and advanced packaging for power management applications.

The AOZ1341 family was designed specifically for USB and general-purpose power distribution systems demanding robust short-circuit tolerance, low R_DS(ON), and integrated protection-targeting space-constrained computing and peripheral platforms.

FAQ

What is the enable logic polarity of AOZ1341EI-1?

The AOZ1341EI-1 uses active-high enable inputs on pins EN1 and EN2. When either pin is driven ≥2.0 V (with VIN ≥2.7 V), the corresponding IN→OUT path turns on. This eliminates the need for external inverters when interfacing with standard GPIOs. The AOZ1341EI-1 variant is explicitly designated for active-high operation, distinguishing it from the AOZ1341EI (active-low) version.

Does AOZ1341EI-1 provide reverse current blocking?

Yes, AOZ1341EI-1 provides inherent reverse current blocking. When disabled, the high-side N-channel MOSFETs enter high-impedance state, preventing current flow from OUTx back to IN-even if OUTx is held at a higher voltage than IN. This protects upstream power sources from backfeeding during hot-swap or fault conditions, and is confirmed in the "Power Switch" section of the datasheet.

What is the thermal performance of AOZ1341EI-1 in its MSOP-8 package?

The AOZ1341EI-1 in Exposed Pad MSOP-8 has a junction-to-ambient thermal resistance (Θ_JA) of 60 °C/W under standard JEDEC PCB conditions. This allows continuous 1 A per channel operation at +85 °C ambient without forced airflow. The exposed thermal pad must be soldered to a minimum 100 mm² copper pour for optimal performance, as specified in the layout guidelines on page 10 of the datasheet.

How does the overcurrent flag (OC1/OC2) behave during a fault?

Each OC pin (OC1 and OC2) is an open-drain output that pulls low during an overcurrent event on its respective channel. The assertion is deglitched with 4–15 ms blanking time to reject transient spikes. The flag remains low until the fault condition is removed and the device recovers-either automatically after thermal cooldown or upon enable toggle. No latching occurs; the device resumes normal operation once the load returns within limits.

Can AOZ1341EI-1 operate from a 3.3 V supply?

Yes, AOZ1341EI-1 fully supports 3.3 V input operation. Its VIN range is 2.7 V to 5.5 V, and all specifications-including R_DS(ON), current limit, and enable thresholds-are guaranteed across this range. At 3.3 V, typical R_DS(ON) remains ≤135 mΩ, and the internal charge pump ensures reliable gate drive without external components, as verified in the Electrical Characteristics table on page 3.