Diodes Incorporated AP2331FJ-7

Overview

AP2331FJ-7 from Diodes Incorporated is a single-channel, current-limited high-side load switch optimized for hot-swap and capacitive-load applications. It delivers 0.2A continuous output, features 250mΩ R_DS(ON), reverse-current blocking, and integrated protection including over-current (0.4A limit), over-temperature (150°C shutdown), short-circuit, and output over-voltage (5.6V trip). It operates across 2.7V–5.2V input and is used in USB-powered peripherals and embedded power rails.

For engineers reviewing the AP2331FJ-7 datasheet, AP2331FJ-7 pinout, AP2331FJ-7 application, or AP2331FJ-7 equivalent, key selection criteria include its 0.7ms soft-start turn-on time, 0.7ms deglitch response to reverse current, 180°C/W θ_JA in U-DFN2020-3, and compliance with USB reverse-current requirements in portable systems.

Technical Context

The AP2331FJ-7 implements a thermally robust high-side NMOS switch with internal current-sense FET architecture-eliminating external sense resistors-and active deglitch timing (0.7ms) for reverse-current fault detection. Its UVLO threshold (2.65V typ.) ensures controlled startup under marginal supply conditions.

Protection logic integrates independent comparators for over-voltage (5.6V trip), reverse-current (0.25A trigger), and thermal shutdown (150°C with 20°C hysteresis), each driving autonomous MOSFET disable without host intervention. Output discharge occurs via an internal 800Ω NMOS when UVLO falls.

Key Specifications

Pinout & Package

AP2331FJ-7 is housed in a 2.0mm × 2.0mm × 0.6mm U-DFN2020-3 package with exposed thermal pad (pin 1 = GND, pin 2 = OUT, pin 3 = IN), optimized for low-inductance, high-current routing and thermal conduction to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCK107AG,315 and TPS22915BYFPR, AP2331FJ-7 uniquely combines USB-compliant reverse-current blocking, output over-voltage protection, and sub-millisecond soft-start in a 2mm×2mm footprint-making it optimal for space-constrained, safety-critical hot-swap interfaces where autonomous fault handling is required.

Availability

AP2331FJ-7 is available at Aetrix Electronics and suitable for USB peripheral power switching, embedded system hot-swap rails, laptop docking station port control, and smartphone accessory detection requiring stable component supply and full protection integration.

Supply support for AP2331FJ-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The AP2331 product line targets compact, high-reliability load switching in USB, docking, and hot-plug applications-designed to replace discrete MOSFET+controller solutions with integrated protection and timing control.

FAQ

What is the maximum allowable output capacitance for stable AP2331FJ-7 operation?

The AP2331FJ-7 is characterized with 0.1µF output capacitance in its typical application circuit and supports up to 10µF with stable soft-start behavior. Larger values (e.g., 100µF) may extend turn-on time beyond 0.7ms and require verification of inrush current against the 0.4A current limit; layout inductance must remain below 10nH to avoid oscillation during transition.

Does AP2331FJ-7 require an external pull-up or pull-down resistor on any pin?

No external biasing resistors are required. The IN pin is directly driven by the input supply, GND is hard-connected to system ground, and OUT has no control pins. All internal functions-including UVLO, OVP, and thermal shutdown-are fully autonomous and do not rely on external components for basic operation.

How does the AP2331FJ-7 behave during a sustained short-circuit event?

Upon short-circuit detection, the device immediately enters current-limit mode (0.4A), clamping output voltage near zero. If the fault persists beyond thermal time constants, junction temperature rises to 150°C, triggering shutdown. After cooling by 20°C (to ~130°C), the device auto-restarts-cycling until fault removal-providing pulsed output rather than latching off.

Can AP2331FJ-7 be used with 1.8V or 2.5V input rails?

No. The absolute minimum input voltage is 2.7V per datasheet specifications, and UVLO activates below 2.35V. Operation at 1.8V or 2.5V is outside rated conditions and will result in undefined behavior, including failure to turn on or erratic protection activation.