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Diodes Incorporated AP2171WG-7
- Part No.:
- AP2171WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2171WG-7.pdf
- Description:
- IC PWR SWITCH P-CHAN 1:1 SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:83,458
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Product details
Overview
AP2171WG-7 from Diodes Incorporated is a single-channel, active-high enable, current-limited high-side power switch optimized for USB 2.0 hot-swap applications. It delivers 1.5A accurate current limiting, 95mΩ typical RDS(ON) at 5V input, reverse current blocking, and integrated 7ms deglitch on the open-drain FLG output - all in a SOT25 package. It operates across 2.7V–5.5V input and supports consumer electronics power delivery with thermal shutdown at 140°C.
For engineers reviewing the AP2171WG-7 datasheet, AP2171WG-7 pinout, AP2171WG-7 application, or AP2171WG-7 equivalent, this device is selected for precise overcurrent protection in space-constrained USB ports, where controlled 0.6ms rise time, <1µA shutdown current, and fault reporting without external components are critical design requirements.
Technical Context
The AP2171WG-7 integrates a low-RDS(ON) N-channel MOSFET with current-sense FET architecture to enable accurate 1.5A current limiting without series resistors. Its UVLO (1.9V typ) ensures safe turn-on only after stable input rail establishment, while thermal sensing triggers shutdown at 140°C with 25°C hysteresis.
It features an active-high EN input, open-drain FLG output with 7ms blanking to suppress false overcurrent reports during capacitive load inrush, and reverse current blocking that prevents backflow when disabled - essential for USB VBUS integrity and hot-plug reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit | 1.5A typical - clamps output current precisely to protect downstream loads and upstream supply during overload or short-circuit events. |
| RDS(ON) | 95mΩ max at 5V/25°C - minimizes conduction loss and self-heating in 1A continuous operation within SOT25 thermal limits. |
| Input Voltage Range | 2.7V–5.5V - fully covers USB 2.0 VBUS tolerance (4.75V–5.25V) and supports legacy 3.3V system rails. |
| Rise Time | 0.6ms typical - soft-starts connected loads to limit inrush current and reduce EMI during hot-plug insertion. |
| Shutdown Current | 1µA max - preserves battery life in portable devices when the switch is disabled. |
| FLG Blanking Time | 7ms typical - filters transient overcurrent spikes from large output capacitors without requiring external RC networks. |
| UVLO Threshold | 1.9V typical - prevents erratic switching during brown-out or power-up sequencing in host-powered USB systems. |
| Thermal Shutdown | 140°C junction temperature - protects internal MOSFET under sustained overload; recovers automatically after 25°C cooldown. |
Pinout & Package
SOT25 package (5-pin, 2.9mm × 1.6mm × 1.1mm), thermally enhanced with exposed pad tied to GND for improved θJA (157°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Power Output | Main switched output node; dual OUT pins (1 & 4) must be externally tied together for full current capability. |
| 2 IN | Power Input | Primary VBUS input; connects to 2.7–5.5V source; requires local 0.1µF ceramic bypass. |
| 3 GND | Ground Reference | Analog and power ground; exposed pad must be soldered to PCB GND plane for thermal and electrical stability. |
| 4 OUT | Power Output | Secondary output pin; electrically identical to Pin 1 and must be paralleled to share current and reduce resistance. |
| 5 EN | Enable Control | Active-high logic input; drives internal driver to turn on MOSFET when ≥2.0V; draws ≤1µA when low. |
| - Exposed Pad | Thermal & Electrical Ground | Not a signal path; must be connected to GND pour with ≥4 thermal vias for reliable thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse Current Blocking | Prevents backflow from output to input when disabled - maintains VBUS isolation in USB OTG or shared-rail systems. |
| Integrated 7ms Deglitch on FLG | Eliminates false fault reporting during capacitor charging transients - no external RC filter needed for robust USB compliance. |
| Controlled 0.6ms Rise Time | Soft-starts downstream loads to limit peak inrush current below 2A - avoids tripping upstream current limiters or causing supply droop. |
| 1.5A Accurate Current Limit | Guaranteed ±20% tolerance over -40°C to +85°C - enables predictable fault response without calibration or trimming. |
| Ultra-Low 1µA Shutdown Current | Extends battery runtime in always-on USB peripherals (e.g., docking stations, HUBs) during standby mode. |
Applications
| USB 2.0 Downstream Port | Laptop Docking Station Power Switch |
|---|---|
|
Use Scenario: Single-port USB 2.0 hub on a motherboard supplying VBUS to a peripheral device. IC Role / Device Role / Timing Role: High-side power switch controlling VBUS delivery; enables/disables port power under host software control via EN. Use Value: Prevents bus enumeration failure by suppressing inrush current and reporting overcurrent faults via FLG to the USB controller. |
Use Scenario: Power distribution to USB-C or legacy USB-A ports on a laptop docking station. IC Role / Device Role / Timing Role: Independent channel switch per port, providing isolated current limiting and thermal protection for each connected device. Use Value: Enables hot-plug safety and prevents cascading failures - if one port shorts, only that channel shuts down without affecting others. |
| Smartphone Charging Circuit | Set-Top Box USB Peripheral Interface |
|
Use Scenario: USB port powering accessories (keyboard, mouse) while smartphone acts as host. IC Role / Device Role / Timing Role: Reverse-current-blocking high-side switch ensuring VBUS does not backfeed into phone battery during accessory disconnect. Use Value: Meets USB On-The-Go (OTG) specification requirements for power integrity and fault containment in mobile host mode. |
Use Scenario: Front-panel USB port on cable/satellite set-top box used for firmware updates or media transfer. IC Role / Device Role / Timing Role: Protected power switch with UVLO and thermal shutdown - ensures reliable operation despite unstable wall-adapter input. Use Value: Eliminates need for discrete fuse or polyfuse, reducing BOM count while improving trip accuracy and reset behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-limited power switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2161WG-7 | Active-low EN input; otherwise identical current limit, RDS(ON), and protection features. | Requires inverted logic drive from host MCU or USB controller; unsuitable where EN is directly tied to 3.3V GPIO. | Select when system-level enable logic is active-low or when consolidating BOM with existing AP2161 designs. |
| TCK112G,LF | Lower 60mΩ RDS(ON) but higher 2.5A current limit; no integrated FLG deglitch; requires external RC for noise immunity. | Designed for industrial 24V systems; lacks USB-specific UVLO and thermal hysteresis tuning for consumer ambient ranges. | Prefer only in non-USB, higher-voltage applications where lower conduction loss outweighs missing USB-optimized features. |
Compared with AP2161WG-7, the AP2171WG-7 simplifies interface design with active-high EN, while TCK112G offers lower RDS(ON) at the cost of USB-specific protections and integrated fault filtering - making AP2171WG-7 the optimal choice for compact, standards-compliant USB power switching.
Availability
AP2171WG-7 is available at Aetrix Electronics and suitable for USB 2.0 port protection, laptop docking station power management, and set-top box peripheral interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AP2171WG-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and protection applications.
The AP2171 belongs to Diodes' USB Power Switch product line, engineered specifically for reliable, space-efficient current limiting and fault reporting in consumer and computing USB endpoints - balancing precision, thermal resilience, and plug-and-play integration.
FAQ
What is the maximum continuous load current supported by AP2171WG-7?
The AP2171WG-7 is rated for 1.0A maximum continuous load current per Diodes' Recommended Operating Conditions, even though its current-limit threshold is 1.5A. This derating accounts for thermal dissipation in the SOT25 package at +85°C ambient, ensuring reliable operation without exceeding 150°C junction temperature under worst-case RDS(ON) and layout conditions.
Does AP2171WG-7 require external components for overcurrent fault reporting?
No. The AP2171WG-7 integrates a 7ms deglitch circuit on its open-drain FLG pin, eliminating the need for external RC filters to suppress false triggers during capacitive load inrush. A pull-up resistor (typically 10kΩ to 3.3V or 5V) is required on FLG to generate a valid logic-high when no fault is present.
Can AP2171WG-7 be used in USB-C applications?
The AP2171WG-7 is specified for USB 2.0 compliance and supports 5V-only VBUS switching. It is not rated for USB-C alternate modes, 20V PD, or CC logic detection. However, it remains suitable for USB-C receptacles operating in legacy USB 2.0 data + 5V power mode - provided VBUS stays within 2.7V–5.5V and current demand remains ≤1.0A.
How does the reverse current blocking function operate in AP2171WG-7?
When disabled (EN = low), the internal MOSFET's body diode is reverse-biased due to integrated charge-pump-assisted gate control, blocking current flow from OUT to IN. This prevents backfeeding into upstream supplies - critical for USB OTG host operation and maintaining VBUS isolation during peripheral hot-unplug events.
AP2171WG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Type:
- USB Switch
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- P-Channel
- Interface:
- On/Off
- Voltage - Load:
- 2.7V ~ 5.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 1A
- Rds On (Typ):
- 95mOhm
- Input Type:
- Non-Inverting
- Features:
- Status Flag
- Fault Protection:
- Current Limiting (Fixed), Over Temperature, Reverse Current, UVLO
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
AP2171WG-7 FAQ
1.How can I place an order for AP2171WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2171WG-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AP2171WG-7 reliable?
The price and inventory of AP2171WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2171WG-7 is usually 5 days.
3.What payment methods are accepted for AP2171WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2171WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2171WG-7?
AP2171WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2171WG-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AP2171WG-7?
For technical support, including AP2171WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2171WG-7 requirements.
6.How does Aetrix verify that AP2171WG-7 is sourced from the original manufacturer or authorized distributors?
All AP2171WG-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP2171WG-7 meets industry standards.
7.What is the process for return or replacement of AP2171WG-7?
All AP2171WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP2171WG-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AP2171WG-7 part is unused and in its original packaging.
Return procedure for AP2171WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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