Diodes Incorporated AP2161FMG-7

Overview

AP2161FMG-7 from Diodes Incorporated is a single-channel, active-low enable, high-side USB power switch with 1.5A current limiting, 95mΩ R_DS(ON), and integrated short-circuit/thermal protection. It operates from 2.7V–5.5V input, features 0.6ms typical rise time and 7ms deglitch on the open-drain FLG output, and is qualified for USB 2.0 hot-swap applications in consumer electronics and computing peripherals.

For engineers reviewing the AP2161FMG-7 datasheet, AP2161FMG-7 pinout, AP2161FMG-7 application, or AP2161FMG-7 equivalent, this device delivers precise overcurrent response, reverse current blocking, low shutdown current (1µA max), and robust ESD protection (4kV HBM), making it suitable for space-constrained USB port power management where reliability under transient load faults is critical.

Technical Context

The AP2161FMG-7 implements a MOSFET-based high-side switch with internal current-sense FET architecture-eliminating external sense resistors-and integrates UVLO (1.9V threshold), thermal shutdown at ~145°C with 25°C hysteresis, and controlled slew-rate turn-on to limit inrush. Its FLG output uses a 7ms blanking window to suppress false fault reporting during capacitive load transients.

It supports dual-mode USB compliance: as a host/self-powered hub port switch (per USB 2.0 spec), and as a generic hot-plug controller. The U-DFN2018-6 package includes an exposed thermal pad tied to GND for enhanced thermal performance (θ_JA = 70°C/W), enabling 1A continuous operation without external heatsinking under typical PCB layout conditions.

Key Specifications

Pinout & Package

AP2161FMG-7 is housed in a 6-pin U-DFN2018-6 package (2.0mm × 1.8mm, 0.5mm pitch) with an exposed thermal pad on the bottom surface. The pad must be soldered to a GND copper pour with ≥3 thermal vias for optimal thermal performance; it is not an electrical ground conduction path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2171FMG-7, the AP2161FMG-7 offers identical protection and performance but simplifies enable logic in systems where low-active control aligns with existing firmware state machines; versus TUSB2036IPW, it provides higher per-port current capacity and lower BOM count for dedicated power switching without hub protocol overhead.

Availability

AP2161FMG-7 is available at Aetrix Electronics and suitable for USB 2.0 host port power control, self-powered hub downstream switching, and hot-swap module sequencing requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP2161FMG-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 consumer, computing, and industrial markets.

The AP2161/AP2171 family belongs to Diodes' USB Power Switch product line, engineered specifically for compliant, space-efficient, and thermally robust USB 2.0 port power control in host, hub, and hot-plug applications.

FAQ

What is the maximum continuous load current supported by AP2161FMG-7?

The AP2161FMG-7 is rated for 1.0A maximum continuous load current per the datasheet's Recommended Operating Conditions. Although its current limit threshold is 1.5A (typ), sustained operation above 1.0A risks exceeding thermal limits in the U-DFN2018-6 package without aggressive PCB thermal design - confirmed by θ_JA = 70°C/W and power dissipation calculations at 1.0A × 90mΩ = 90mW.

Can AP2161FMG-7 be used in USB-C applications?

AP2161FMG-7 is not USB-C native but can serve as a VBUS switch in USB-C sink applications where 5V-only power delivery is required. It lacks CC logic, PD communication, or 20V support; however, its 2.7V–5.5V input range, reverse current blocking, and 1.5A current limit make it suitable for 5V-only USB-C peripherals like portable monitors or docks that do not negotiate higher voltages.

How does the 7ms FLG deglitch work during capacitor charging?

The 7ms deglitch timer starts when FLG would otherwise assert due to overcurrent detection. During output capacitor (e.g., 68µF) charging, momentary inrush may exceed 1.5A briefly; the timer ignores such events if they subside within 7ms. Only sustained overloads (>7ms) trigger FLG - verified in Figure 6 of DS31564 Rev. 9-2, eliminating need for external filtering components.

Is the exposed pad on U-DFN2018-6 electrically connected?

No - the exposed thermal pad on AP2161FMG-7 is not internally connected to any circuit node. Per datasheet Note in Pin Descriptions, it must be soldered to GND for thermal performance but must not be used as an electrical ground conduction path. Electrical grounding is handled solely through Pin 3 (GND).