Diodes Incorporated AP2161SG-13

Overview

AP2161SG-13 from Diodes Incorporated is a single-channel, active-low enable, current-limited high-side power switch optimized for USB 2.0 hot-swap applications. It delivers 1.5A accurate current limiting, 95mΩ typical R_DS(ON) at 5V, and integrated short-circuit/thermal protection with 7ms deglitch on the open-drain FLG output. Used in laptop USB ports and self-powered hubs to enforce compliance and prevent bus overloads.

For engineers reviewing the AP2161SG-13 datasheet, AP2161SG-13 pinout, AP2161SG-13 application, or AP2161SG-13 equivalent, this device serves as a robust, RoHS-compliant USB power delivery controller with precise current limiting, reverse current blocking, and UVLO functionality - critical for stable hot-plug operation in consumer and computing systems.

Technical Context

The AP2161SG-13 implements a MOSFET-based high-side switch with internal current-sense FET architecture-eliminating external sense resistors while maintaining <±10% current limit accuracy across temperature. Its thermal shutdown triggers at ~140°C with 25°C hysteresis, enabling safe cycling under sustained overload.

UVLO activates below 1.9V (typ) to prevent erratic turn-on during power ramp-up; the 0.6ms typical rise time and controlled slew rate (<100A/s) suppress inrush-induced transients. The FLG output integrates a 7ms blanking window to reject false fault reporting from capacitive load surges.

Key Specifications

Pinout & Package

AP2161SG-13 is packaged in SO-8 (standard plastic small-outline), with exposed pad not electrically connected but recommended for GND thermal anchoring. Pin functions are validated per Diodes DS31564 Rev. 9-2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2036IRHBR and TPS2051BDBVR, AP2161SG-13 provides dedicated single-channel control with reverse blocking, tighter 7ms FLG blanking, and lower R_DS(ON)-making it optimal for discrete, space-constrained USB port protection where per-port fault isolation and backfeed prevention are mandatory.

Availability

AP2161SG-13 is available at Aetrix Electronics and suitable for USB host port protection, self-powered hub designs, and laptop peripheral power management requiring stable component supply, long-term lifecycle support, and green RoHS compliance.

Supply support for AP2161SG-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 high-reliability power management, signal integrity, and protection solutions for consumer, computing, and industrial markets.

The AP2161/2171 family was designed specifically for USB 2.0-compliant hot-swap power distribution-delivering integrated current limiting, thermal safety, and fault reporting in compact surface-mount packages for space-constrained endpoint devices.

FAQ

What is the maximum continuous load current supported by AP2161SG-13?

The AP2161SG-13 is rated for 1.0A maximum continuous load current per Diodes' Recommended Operating Conditions, despite its 1.5A current-limit threshold. This derating ensures safe thermal operation in SO-8 at +85°C ambient with typical PCB copper area, preventing junction temperature exceedance under sustained load.

Does AP2161SG-13 require external components for basic USB port protection?

No external components are required for core functionality: current limiting, thermal shutdown, UVLO, and FLG reporting are fully integrated. A 0.1µF ceramic bypass capacitor on IN-GND is recommended for stability, and 120µF output capacitance is advised for heavy loads-but neither is mandatory for basic operation.

How does the FLG output behave during a short-circuit event?

Upon short-circuit detection, the FLG pin transitions low after a nominal 7ms deglitch period and remains low until both overcurrent and over-temperature conditions clear. It does not pulse or auto-clear; host firmware must detect the sustained low state and respond (e.g., disable EN) to restore operation.

Can AP2161SG-13 be used in dual-role USB ports (e.g., charging + data)?

No-Diodes explicitly advises against use in dual-purpose ports like shared HDMI/MHL where voltage may be present on OUT while IN is ramping. Back-biasing the internal MOSFET under such conditions risks overstress; dedicated bidirectional or charge-pump architectures are required instead.