Diodes Incorporated AP2161DWG-7

Overview

AP2161DWG-7 from Diodes Incorporated is a single-channel, active-low enable, high-side USB power switch with 1.5A current limiting, 90mΩ R_DS(ON) (U-DFN2018-6), output discharge, and integrated fault reporting via open-drain FLG pin. It operates from 2.7V–5.5V input, delivers controlled 0.6ms rise time, and provides reverse-current blocking and UVLO for hot-swap protection in USB 2.0-compliant host ports.

For engineers reviewing the AP2161DWG-7 datasheet, AP2161DWG-7 pinout, AP2161DWG-7 application, or AP2161DWG-7 equivalent, this device is selected for precise current-limited power delivery in space-constrained USB peripheral ports requiring fast transient response, thermal/short-circuit protection, and automatic output discharge on disable - without external deglitch components.

Technical Context

The AP2161DWG-7 integrates a low-R_DS(ON) N-channel MOSFET with gate driver, slew-rate control, and current-sense FET for accurate 1.5A overcurrent limiting. Its UVLO activates at 1.9V (typ) and disables switching until VIN exceeds threshold, ensuring safe startup during hot-insertion.

Thermal shutdown triggers at 140°C with 25°C hysteresis, causing pulsed output cycling until fault removal. The 7ms FLG deglitch window suppresses false fault reporting during capacitive load turn-on transients, while the internal 100Ω discharge path actively pulls OUT to GND when EN is de-asserted.

Key Specifications

Pinout & Package

AP2161DWG-7 is supplied in the U-DFN2018-6 package: 2.0mm × 1.8mm, 0.5mm pitch, exposed thermal pad (to be connected to GND). This thermally enhanced leadless package supports high-current operation in compact USB port designs.

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, the AP2161DWG-7 uniquely combines active-low enable, integrated 100Ω discharge, and 7ms FLG deglitch in a 2.0×1.8mm U-DFN package - making it optimal for compact, self-contained USB port protection where autonomous fault handling and zero external components are critical.

Availability

AP2161DWG-7 is available at Aetrix Electronics and suitable for USB host port protection, hot-swap module control, and consumer display peripheral power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP2161DWG-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 AP2161D/AP2171D product line targets USB 2.0-compliant hot-swap applications, delivering integrated current limiting, thermal protection, and output discharge in miniature packages to simplify front-end power architecture in space-constrained designs.

FAQ

What is the function of the FLG pin on AP2161DWG-7?

The FLG pin is an open-drain fault indicator that pulls low when either overcurrent or overtemperature conditions occur. It incorporates a built-in 7ms deglitch timer to suppress false triggering during capacitive load turn-on transients. The pin remains asserted until both fault conditions are cleared, providing reliable system-level fault detection without external timing components.

Does AP2161DWG-7 support reverse current blocking?

Yes. AP2161DWG-7 includes integrated reverse current blocking that prevents current flow from OUT to IN when the switch is disabled and V_OUT exceeds V_IN. This feature protects upstream power sources from backfeeding and eliminates the need for external reverse-blocking diodes in USB VBUS paths.

How does the output discharge function operate?

When the EN pin is de-asserted (driven high), an internal 100Ω NMOS transistor connects OUT to GND, discharging external output capacitance. For a 1µF capacitor, discharge time to <0.5V is typically 0.6ms. This ensures no residual voltage remains on the load, preventing unintended operation or ESD risks during hot removal.

What is the maximum continuous load current rating for AP2161DWG-7?

The recommended maximum continuous load current is 1.0A, as specified in the "Available Options" table of the datasheet. Although the current limit threshold is 1.5A (typ), sustained operation above 1.0A requires careful thermal design due to R_DS(ON) heating - especially in the U-DFN2018-6 package with θ_JA = 70°C/W.