Diodes Incorporated AP2401SN-7

Overview

AP2401SN-7 from Diodes Incorporated is a single-channel, current-limited high-side power switch optimized for USB and hot-swap applications. It features 2.5A accurate current limiting, 70mΩ typical R_DS(ON) at 5V, latch-off over-current protection with 7ms deglitch, and integrated output discharge. Designed for use in laptops and docking stations, it operates from 2.7V to 5.5V input and supports -40°C to +85°C ambient temperature.

For engineers reviewing the AP2401SN-7 datasheet, AP2401SN-7 pinout, AP2401SN-7 application, or AP2401SN-7 equivalent, key selection criteria include its active-low enable logic, U-DFN2020-6 package footprint, 2µs short-circuit response time, thermal shutdown at 140°C, and compatibility with heavy capacitive loads requiring controlled rise time and reverse current blocking.

Technical Context

The AP2401SN-7 implements an N-channel MOSFET high-side switch with internal current-sense FET architecture-eliminating external sense resistors while maintaining low conduction loss. Its protection logic combines fast 2µs short-circuit detection with 7ms deglitch timing before latching off, ensuring robustness against transient overloads without false triggering.

It integrates under-voltage lockout (UVLO) with 2.0V turn-on threshold and 50mV hysteresis, plus thermal shutdown at 140°C with 20°C hysteresis. The open-drain FLG pin reports both over-current and over-temperature faults after blanking, and the built-in discharge path (100Ω typical) actively discharges output capacitance when disabled.

Key Specifications

Pinout & Package

AP2401SN-7 is housed in a 2.0mm × 2.0mm × 0.55mm U-DFN2020-6 package with wettable flank leads and an exposed thermal pad. The package is RoHS-compliant, halogen-free, and rated for UL E322375 recognition.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2401FGE-7, AP2401SN-7 offers smaller board area at the cost of slightly reduced thermal margin; compared with TPL7407LPG, it delivers higher single-channel current, high-side operation, and full fault protection-making it suitable for USB-compliant power delivery rather than general-purpose logic switching.

Availability

AP2401SN-7 is available at Aetrix Electronics and suitable for USB peripheral management, laptop docking station power distribution, and set-top box hub protection requiring stable component supply across production lifecycles.

Supply support for AP2401SN-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 high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP2401/AP2411 family was designed specifically for USB-compliant hot-swap power control-delivering integrated protection, small-footprint packaging, and latch-off behavior to simplify system-level fault recovery in space-constrained portable electronics.

FAQ

What is the function of the FLG pin on AP2401SN-7?

The FLG pin is an open-drain, active-low fault indicator that asserts after a 7ms deglitch period when over-current or over-temperature conditions occur. It remains low until power is cycled or the EN pin is toggled, signaling latched-off state to the host controller. No external pull-up is required for basic fault detection, though a 10kΩ resistor to V_IN is recommended for noise immunity.

Does AP2401SN-7 require external components for basic operation?

Yes-minimum external components include a 0.1µF ceramic capacitor between IN and GND, and a pull-up resistor on the FLG pin if interfacing with logic inputs. An optional 10kΩ resistor on EN provides default-disable behavior. No external current-sense resistor, discharge FET, or UVLO circuitry is needed-the device integrates all core protection functions.

Can AP2401SN-7 drive a 2.2A continuous load at 85°C ambient?

No-its recommended maximum continuous load current is 2.0A per datasheet. At 85°C ambient and 5V input, R_DS(ON) rises to 135mΩ, increasing conduction loss. Sustained 2.2A would exceed thermal limits unless PCB thermal design (e.g., copper area, vias) reduces θ_JA significantly below the rated 90°C/W for U-DFN2020-6.

How does the output discharge function operate in AP2401SN-7?

The discharge function activates automatically when EN is de-asserted or during power-down (VIN < V_UVLO). It connects a 100Ω internal path between OUT and GND, discharging output capacitance to <0.5V in 0.6ms with 1µF load. This prevents floating voltages and ensures safe hot-swap sequencing without external circuitry.