Alpha & Omega Semiconductor Inc. AOZ1373DI-02

Overview

AOZ1373DI-02 from Alpha and Omega Semiconductor is a latch-off high-side protection switch with true reverse-current blocking (TRCB), 39 mΩ typical R_ON, 3.4–22 V input range, and integrated over-voltage, under-voltage, thermal, and short-circuit protection - designed for USB Type-C PD power path control in docking stations and portable computing systems.

For engineers reviewing the AOZ1373DI-02 datasheet, pinout, applications, or equivalent options, key selection considerations include fault recovery behavior (latch-off vs. auto-restart), TRCB threshold (26 mV), programmable OVP via POVP resistor, soft-start timing control via CSS capacitor, and DFN-12 package thermal performance (θ_JA = 54°C/W).

Technical Context

The AOZ1373DI-02 implements dual back-to-back N-channel MOSFETs to enable bidirectional isolation and true reverse-current blocking at all times - triggered when V_OUT exceeds V_VIN by ≥26 mV with 500 ns response. Its latch-off fault recovery requires explicit ENB toggle or VIN cycling, distinguishing it from the AOZ1373DI-01 auto-restart variant.

Protection logic integrates independent comparators for UVLO (3.35 V threshold, 300 mV hysteresis), OVP (selectable 5.8 V or 24 V via POVP bias), and thermal shutdown (140°C trip, 30°C hysteresis), all feeding into a centralized control block that forces immediate gate turn-off and pulls FLTB low during any active fault condition.

Key Specifications

Pinout & Package

AOZ1373DI-02 uses a 3 mm × 3 mm DFN-12L package with exposed thermal pad (EXP), rated for −40°C to +85°C ambient operation and optimized for PCB heat spreading via multi-layer ground vias under EXP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AOZ1373DI-02, the AOZ1373DI-01 offers identical protection features but trades deterministic fault clearance for autonomous recovery, while the TCK112G sacrifices TRCB and OVP programmability for smaller size and lower R_ON - making AOZ1373DI-02 uniquely suited for robust, standards-compliant USB-C PD implementations requiring guaranteed fault isolation.

Availability

AOZ1373DI-02 is available at Aetrix Electronics and suitable for USB-C docking stations, portable monitors, notebook peripheral ports, and Thunderbolt 4 dongles requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AOZ1373DI-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 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 AOZ1373DI product line delivers ECPower™-enhanced protection switches targeting USB Type-C PD systems, emphasizing true reverse-current blocking, latch-off safety, and programmable fault thresholds for next-generation portable computing interfaces.

FAQ

What fault conditions trigger latch-off behavior in the AOZ1373DI-02?

The AOZ1373DI-02 enters latch-off state upon detection of input over-voltage (exceeding programmed OVP threshold), true reverse-current (V_OUT > V_VIN by ≥26 mV), over-temperature (junction ≥140°C), or short-circuit events. Unlike the AOZ1373DI-01, it remains latched until ENB is toggled or VIN is cycled - ensuring no automatic re-engagement during unsafe conditions.

How does the AOZ1373DI-02 implement True Reverse Current Blocking (TRCB)?

The AOZ1373DI-02 uses internal comparators to continuously monitor the V_OUT–V_VIN differential; when this difference reaches +26 mV, it immediately disables both back-to-back N-MOSFETs and pulls FLTB low. This hardware-level action occurs within 500 ns and requires no external components - a core feature distinguishing AOZ1373DI-02 from standard high-side switches.

Can the over-voltage protection threshold of the AOZ1373DI-02 be adjusted, and how?

Yes - the AOZ1373DI-02 supports two OVP thresholds: 5.8 V (when POVP is left open) or 24 V (when POVP is tied to GND). An internal 8 µA current source biases POVP, and the voltage at that pin determines the comparator trip point per the datasheet's Table 1. No additional circuitry is required beyond the single resistor or open connection.

What is the role of the SS pin on the AOZ1373DI-02, and how is it configured?

The SS pin on the AOZ1373DI-02 sets soft-start timing by connecting an external capacitor (CSS) to GND. This capacitor controls the gate drive slew rate during turn-on, linearly ramping V_OUT from 10% to 90% over a time defined by VIN, VOVP, and CSS value - e.g., 21 ms with 5.6 nF. It prevents inrush current spikes into large output capacitances like those found in USB-C PD systems.

Is the AOZ1373DI-02 compatible with the AOZ1373DI-01 in terms of PCB layout and thermal design?

Yes - both AOZ1373DI-02 and AOZ1373DI-01 share identical DFN-12L package dimensions, pinout, thermal pad (EXP) configuration, and θ_JA (54°C/W). The same PCB footprint, stencil design, and thermal via pattern used for AOZ1373DI-01 apply directly to AOZ1373DI-02, enabling drop-in replacement where latch-off behavior is required.