Alpha & Omega Semiconductor Inc. AOZ1361DI-01

Overview

AOZ1361DI-01 from Alpha & Omega Semiconductor is a P-channel high-side load switch with auto-restart thermal protection, 4.5V–28V input range, 35mΩ max R_DS(ON), programmable current limit (2–3.4A), and open-drain FLTB fault indicator. It delivers controlled hot-swap power sequencing in notebook PC power rails and industrial hot-swap supplies.

For engineers reviewing the AOZ1361DI-01 datasheet, pinout, applications, or equivalent options, key selection criteria include auto-restart behavior under over-current/thermal fault, adjustable soft-start via SS pin capacitor, external current limit resistor configuration, and DFN 4×4 10-pin thermal performance (63°C/W).

Technical Context

The AOZ1361DI-01 integrates a P-channel MOSFET with gate driver, UVLO (4.4V threshold), thermal shutdown at 130°C with 30°C hysteresis, and fault delay timing set by TFLT capacitor. Its auto-restart mode cycles ON/OFF after thermal shutdown until fault clears or EN is deasserted.

Current limiting is implemented via SET pin reference voltage compared to internal current-sense amplifier output; soft-start slew rate is linearly controlled by SS pin capacitor (0.001–0.1µF); FLTB asserts low after 600µs fault delay for over-current or thermal events.

Key Specifications

Pinout & Package

AOZ1361DI-01 uses a RoHS-compliant DFN 4×4 mm, 10-pin package with exposed thermal pad (JEDEC MO-229WEED), rated for -40°C to +85°C ambient operation and 63°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AOZ1361DI-01, TPS22965DSGR offers lower conduction loss but lacks auto-restart and programmable current limit; RT9711CGQW trades off performance and flexibility for footprint and cost reduction - AOZ1361DI-01 uniquely balances programmability, thermal resilience, and fault autonomy in a 4×4 mm DFN.

Availability

AOZ1361DI-01 is available at Aetrix Electronics and suitable for notebook PC power management, hot-swap server supplies, and industrial I/O module design requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AOZ1361DI-01 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, load switches, and power ICs for computing, industrial, and consumer markets.

The AOZ1361DI product line delivers programmable, thermally robust high-side load switches optimized for hot-plug power sequencing and fault-resilient system power domains.

FAQ

What distinguishes AOZ1361DI-01 from AOZ1361DI-02?

The AOZ1361DI-01 implements auto-restart thermal protection: after shutdown at 130°C, it automatically resumes operation once die temperature falls below 100°C. In contrast, AOZ1361DI-02 latches off permanently until EN is toggled or VIN is cycled. This makes AOZ1361DI-01 ideal for unattended systems where manual reset is impractical, while AOZ1361DI-01's behavior is explicitly defined in Rev. 1.4 datasheet Figure 5 and Section 8.1.

How is current limit set on AOZ1361DI-01?

Current limit on AOZ1361DI-01 is set by connecting a resistor between the SET pin and GND. For example, a 74.5kΩ resistor yields a typical 2.7A limit (per datasheet Figure 3 and Electrical Characteristics table). The relationship is monotonic and calibrated across temperature; no calibration or feedback loop is required - the AOZ1361DI-01 handles all sensing and clamping internally.

What is the purpose of the TFLT pin on AOZ1361DI-01?

The TFLT pin on AOZ1361DI-01 sets the fault delay time before FLTB asserts low during over-current or thermal events. A capacitor from TFLT to GND determines this delay - 1nF yields 600µs (per datasheet page 3 and Section 8.4). This prevents false triggering from brief inrush peaks while maintaining fast response to sustained faults - a key differentiator for reliable hot-swap operation in AOZ1361DI-01.

Can AOZ1361DI-01 operate at 4.5V input?

Yes, AOZ1361DI-01 operates down to 4.5V input, as confirmed by Absolute Maximum Ratings (4.5V min VIN) and Recommended Operating Ratings. At 4.5V, R_DS(ON) rises to 43mΩ max (per Electrical Characteristics table), increasing conduction loss but remaining fully functional - critical for legacy 5V-rail compatibility in AOZ1361DI-01 designs.

Does AOZ1361DI-01 require an external pull-up on FLTB?

Yes, AOZ1361DI-01 requires an external pull-up resistor (typically 100kΩ to 5V) on the FLTB pin, as specified in Pin Description (page 2) and Applications Information (page 9). FLTB is open-drain and remains high-impedance unless a fault occurs - without the pull-up, the signal cannot drive a valid logic HIGH to host monitoring circuitry, compromising fault detection reliability in AOZ1361DI-01 implementations.