Diodes Incorporated AP2501S-13

Overview

AP2501S-13 from Diodes Incorporated is a single-channel, current-limited high-side power switch optimized for USB 2.0 hot-swap applications, featuring 70 mΩ typical R_DS(ON), 3.7 A typical current limit, and integrated output discharge. It operates from 2.7 V to 5.5 V input, delivers up to 2.5 A continuous load current, and includes reverse current blocking, over-current, over-temperature, short-circuit, and UVLO protection - deployed in LCD TV power rails and USB hub port control.

For engineers reviewing the AP2501S-13 datasheet, AP2501S-13 pinout, AP2501S-13 application, or AP2501S-13 equivalent, key selection criteria include active-low enable logic, SO-8 package thermal performance (θ_JA = 96 °C/W), 2 µs short-circuit response time, and 7 ms FLG deglitch timing - all critical for robust USB port power management in consumer electronics.

Technical Context

The AP2501S-13 integrates a P-channel MOSFET high-side switch with internal current-sense FET architecture, enabling accurate 3.7 A current limiting without external sense resistors. Its UVLO threshold is 2.0 V (rising) with 50 mV hysteresis, and thermal shutdown activates at +140 °C with +20 °C hysteresis.

It implements soft-start via built-in slew-rate control (0.6 ms typical t_R) and uses an N-channel discharge transistor activated only when disabled, providing 100 Ω typical R_DIS for controlled V_OUT discharge. The open-drain FLG pin reports faults after 7 ms deglitching, eliminating false triggers during capacitive inrush.

Key Specifications

Pinout & Package

AP2501S-13 is supplied in SO-8 package with exposed pad (not electrically connected to GND; requires external thermal connection). Pin functions are validated per Diodes DS35577 Rev. 7–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCK107AG and TPS22965, the AP2501S-13 uniquely combines active-low enable, integrated discharge, 7 ms FLG deglitch, and USB-optimized 2.7–5.5 V operation - making it the only option among the three qualified for USB 2.0-compliant hot-swap without design compromises.

Availability

AP2501S-13 is available at Aetrix Electronics and suitable for USB hub port control, LCD TV backlight switching, and set-top box peripheral power management requiring stable component supply across consumer electronics production cycles.

Supply support for AP2501S-13 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 high-volume consumer and industrial markets.

The AP2501S-13 belongs to Diodes' AP25xx family of USB-compliant high-side power switches, designed specifically to replace fuses and discrete MOSFETs in hot-swap applications demanding integrated protection and compact footprint.

FAQ

What is the purpose of the NC pin on AP2501S-13?

The NC (No Connect) pin (Pin 8) has no internal connection and serves no electrical function. Diodes recommends tying it externally to the OUT net to improve mechanical stability during reflow and reduce potential EMI coupling through floating metal. It must not be connected to GND or left floating in production layouts.

Does AP2501S-13 require an external pull-up resistor on the FLG pin?

Yes - the FLG pin is an open-drain output and requires an external pull-up resistor (typically 10 kΩ to V_CC or microcontroller I/O rail) to generate a valid logic-high level when no fault is present. Without this resistor, FLG remains undefined during normal operation and cannot interface reliably with monitoring circuitry.

Can AP2501S-13 be used with a 3.3 V input supply?

Yes - AP2501S-13 supports input voltages from 2.7 V to 5.5 V, including 3.3 V nominal rails. At 3.3 V, R_DS(ON) increases to 90 mΩ (typ), resulting in ~560 mW conduction loss at 2.5 A; thermal design must verify junction temperature remains below +150°C using θ_JA = 96 °C/W for SO-8.

How does the output discharge function behave during power-up?

The discharge function activates only when EN is de-asserted (low) or when VIN falls below UVLO threshold (~2.0 V). During power-up with EN held high, discharge is inactive - the output rises via controlled soft-start (0.6 ms t_R). Discharge is never active during normal enabled operation, ensuring load retention.