Diodes Incorporated AP2151AW-7

Overview

AP2151AW-7 from Diodes Incorporated is a single-channel, active-high, current-limited high-side power switch optimized for USB 2.0 hot-swap applications. It delivers 0.5A continuous load current with 95mΩ typical R_DS(ON), 0.8A accurate current limiting, and integrated short-circuit/thermal protection. Its 7ms deglitch-enabled open-drain FLG output reports faults without external components and supports consumer electronics power rail control in LCD monitors and docking stations.

For engineers reviewing the AP2151AW-7 datasheet, AP2151AW-7 pinout, AP2151AW-7 application, or AP2151AW-7 equivalent, this device is selected for USB port power management requiring precise over-current response, reverse current blocking, controlled 0.6ms rise time, and operation across –40°C to +85°C ambient conditions.

Technical Context

The AP2151AW-7 integrates a low-R_DS(ON) N-channel MOSFET with current-sense FET architecture, enabling accurate 0.8A current limiting without external sense resistors. Its UVLO threshold is fixed at 1.9V (typ), ensuring reliable turn-on only after stable input voltage establishment.

Thermal shutdown activates at +140°C with +25°C hysteresis, and the FLG output asserts low after 7ms blanking to reject transient over-current events. The SOT25 package provides 157°C/W θ_JA, supporting thermal management in space-constrained USB peripheral designs.

Key Specifications

Pinout & Package

SOT25 package: 5-pin surface-mount, exposed pad thermally connected to PCB ground plane (not electrical ground path). Pin 1 = EN, Pin 2 = OUT, Pin 3 = GND, Pin 4 = IN, Pin 5 = FLG.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2151AS-13, the AP2151AW-7 offers smaller footprint and lower profile but higher thermal resistance; compared with TUSB2036IRHBR, it provides dedicated, low-overhead power switching without protocol overhead or BOM complexity.

Availability

AP2151AW-7 is available at Aetrix Electronics and suitable for USB port protection, docking station power management, and consumer electronics hot-swap interfaces requiring stable component supply, RoHS compliance, and lead-free "Green" packaging.

Supply support for AP2151AW-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.

The AP2151A family targets USB-compliant hot-swap power distribution, emphasizing precision current limiting, fast fault response, and minimal external component count for cost-sensitive consumer and computing platforms.

FAQ

What is the maximum continuous load current supported by AP2151AW-7?

The AP2151AW-7 is rated for 0.5A maximum continuous load current per its Recommended Operating Conditions table. Although its current limit threshold is 0.8A (typ), sustained operation above 0.5A risks thermal saturation in the SOT25 package due to its 157°C/W θ_JA, especially above +60°C ambient.

Does AP2151AW-7 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 10kΩ to 5V or 3.3V) to generate a valid logic-high level when no fault is present. Without it, FLG remains floating and cannot reliably signal fault clearance to a microcontroller or host controller.

Can AP2151AW-7 be used with a 3.3V input supply?

Yes - the device operates across 2.7V to 5.5V input range. At 3.3V, R_DS(ON) increases to ~120mΩ (typ), resulting in ~60mV dropout at 0.5A. UVLO remains functional (1.9V threshold), and EN logic thresholds scale proportionally (VIH = 2×VIN), so 3.3V systems require ≥2.0V for guaranteed high enable.

How does the 7ms FLG deglitch timer interact with short-circuit recovery?

The 7ms deglitch applies only to FLG assertion - it delays fault reporting but does not affect current-limiting behavior. During a short, the device enters immediate current-limit mode (ILIMIT ≈ 0.8A), then asserts FLG low after 7ms if the condition persists. FLG remains low until both over-current and over-temperature faults clear, with no minimum hold time beyond fault removal.