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Diodes Incorporated AP2181DWG-7
- Part No.:
- AP2181DWG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2181DWG-7.pdf
- Description:
- IC PWR SWITCH P-CHAN 1:1 SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,337
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Product details
Overview
AP2181DWG-7 from Diodes Incorporated is a single-channel, active-low enable, high-side USB power switch with 2.1A current limiting, 90mΩ RDS(ON), and integrated output discharge. It provides overcurrent, thermal, UVLO, and reverse-current protection in SO-8 package for hot-swap USB port power control in laptops and docking stations.
For engineers reviewing the AP2181DWG-7 datasheet, AP2181DWG-7 pinout, AP2181DWG-7 application, or AP2181DWG-7 equivalent, key selection criteria include enable polarity (active-low), 7ms FLG deglitch timing, 0.6ms typical rise time, 1µA shutdown current, and SO-8 thermal resistance (127°C/W).
Technical Context
The device integrates a thermally protected N-channel MOSFET with slew-rate-controlled gate driver, UVLO circuitry that holds output off until VIN ≥1.9V, and a dedicated discharge NMOS (RDIS = 100Ω) activated on EN deassertion. Its current-limiting architecture uses internal sense-FET feedback without external resistors.
FLG is an open-drain fault indicator asserting low on overcurrent or overtemperature events, with built-in 7ms blanking to suppress false triggers from capacitive inrush. Thermal shutdown activates at ~140°C with 25°C hysteresis, enabling self-recovering pulsed operation under sustained overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit | 2.1A typical; clamps output current during overload to prevent damage to downstream circuitry |
| RDS(ON) | 90mΩ max (U-DFN2018-6), 115mΩ max (SO-8); determines I²R power loss and junction temperature rise |
| Input Voltage Range | 2.7V–5.5V; supports full USB 2.0 bus voltage range including VBUS tolerance |
| Enable Polarity | Active-low; enables direct interface with standard logic-level reset or control signals |
| FLG Blanking Time | 7ms typical; eliminates false fault reporting during capacitor charging transients |
| Output Discharge | Internal 100Ω path; discharges output capacitance to <0.5V within 0.6ms when disabled |
| Shutdown Current | 1µA max; minimizes system standby power in battery-powered USB peripherals |
Pinout & Package
AP2181DWG-7 is supplied in SO-8 package (JEDEC MS-012AC) with exposed pad optional per variant; pinout validated per Diodes DS32251 Rev. 4-2 Figure 1 (SO-8 top view). GND and exposed tab must be connected to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Must be tied to OUT for mechanical stability; no electrical function |
| 2,3 (IN) | Power input | Both pins internally bonded; must be externally shorted to minimize impedance |
| 4 (EN) | Active-low enable | Pulled high via resistor to enable; driven low to disable power and activate discharge |
| 5 (FLG) | Open-drain fault flag | Asserts low on overcurrent/overtemperature; requires external pull-up for logic interface |
| 6,7 (OUT) | Switched output | Both pins internally bonded; must be externally shorted to handle 1.5A continuous load |
| 8 (GND) | Power ground | Primary thermal and electrical return path; connects to exposed tab in EP variants |
Key Features
| Feature | Design Value |
|---|---|
| Integrated output discharge | 100Ω internal NMOS enables rapid, controlled VOUT ramp-down without external components |
| 7ms FLG deglitch | Hardware-based blanking prevents false fault latching during hot-plug inrush into 120µF loads |
| Reverse current blocking | Prevents backflow from loaded output to input rail when EN=low, eliminating need for external diode |
| UVLO with hysteresis | Enables safe power sequencing: output remains off until VIN ≥1.9V and stays off until VIN drops below ~1.6V |
| Thermal shutdown recovery | 140°C trip with 25°C hysteresis enables autonomous cycling to sustain operation under intermittent overload |
Applications
| USB 2.0 Port Power Control | Laptop Docking Station Power Management |
|---|---|
Use Scenario: Controlling power delivery to USB peripheral ports in notebook computers with strict inrush and fault response requirements. IC Role / Device Role / Timing Role: High-side power switch providing current-limited, slew-controlled VBUS enable with fault reporting. Use Value: Prevents host port damage from shorted cables or faulty peripherals while meeting USB 2.0 compliance for hot-swap behavior. | Use Scenario: Managing power distribution across multiple USB, HDMI, and Ethernet interfaces on a laptop docking station. IC Role / Device Role / Timing Role: Independent channel switch enabling sequenced power-up of downstream modules with discharge between hot-plug cycles. Use Value: Eliminates voltage glitches and backfeed during module insertion/removal, improving system reliability and ESD robustness. |
| Set-Top Box USB Peripheral Hub | Gaming Console Accessory Port Protection |
Use Scenario: Providing protected USB power to external storage drives or streaming dongles in consumer STBs operating at ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Overcurrent-protected power switch with thermal foldback and UVLO for unattended operation. Use Value: Sustains operation under sustained 1.5A load while automatically recovering from overheating caused by poor ventilation or dust accumulation. | Use Scenario: Safeguarding accessory ports (e.g., VR headset, controller charger) on gaming consoles subject to frequent hot-plug events and ESD exposure. IC Role / Device Role / Timing Role: ESD-hardened (4kV HBM) high-side switch with reverse-current blocking and fast fault reporting. Use Value: Prevents data corruption and port latch-up during aggressive user handling, extending product field life in high-turnover environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side USB power switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2191DWG-7 | Identical specs except active-high EN polarity; same SO-8 package and pinout | Requires inverted control signal; unsuitable where existing firmware expects active-low enable | Select when system logic naturally drives high to enable; avoids external inverter |
| TPS2051BDR | 1.5A limit, 130mΩ RDS(ON), no integrated discharge, 20ms FLG blanking | Lacks output discharge and tighter current accuracy; requires external RC for inrush control | Choose for cost-sensitive designs where discharge is handled elsewhere and 20ms fault latency is acceptable |
Compared with AP2181DWG-7, AP2191DWG-7 offers identical protection and performance but demands active-high control, while TPS2051BDR trades discharge capability and tighter current limit for broader vendor support and lower unit cost in non-USB-optimized systems.
Availability
AP2181DWG-7 is available at Aetrix Electronics and suitable for USB 2.0 port power control, laptop docking station power management, and set-top box peripheral hub applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for AP2181DWG-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 AP2181D/AP2191D family targets USB-compliant hot-swap power distribution, emphasizing integrated protection (UVLO, thermal, reverse-current), precise current limiting, and zero-component discharge-designed specifically for space-constrained, thermally demanding USB host ports.
FAQ
What is the maximum continuous load current supported by AP2181DWG-7?
The AP2181DWG-7 is rated for 1.5A maximum continuous load current per its Recommended Operating Conditions table. Although its current limit threshold is 2.1A typical, sustained operation above 1.5A risks exceeding thermal limits in SO-8 package without enhanced heatsinking, especially above +60°C ambient.
Does AP2181DWG-7 require external components for basic USB port protection?
No external components are required for core protection functions: UVLO, overcurrent limiting, thermal shutdown, and output discharge are fully integrated. A pull-up resistor on FLG and input/output ceramic bypass capacitors (0.1µF each) are recommended for noise immunity and transient suppression per datasheet guidelines.
How does the 7ms FLG deglitch timing affect system fault response?
The 7ms deglitch ensures FLG only asserts for faults lasting longer than typical capacitive inrush (e.g., 120µF load charging), preventing nuisance interrupts. True overcurrent or thermal events persist beyond this window, guaranteeing reliable fault detection while eliminating false positives during normal hot-plug transitions.
Can AP2181DWG-7 be used in dual-role USB ports supporting both data and charging?
No-Diodes explicitly advises against using AP2181D/AP2191D in dual-purpose ports like shared HDMI/MHL or USB-C alternate modes where simultaneous data communication and battery charging occur. The device lacks the bidirectional control and protocol-aware logic needed for such applications.
AP2181DWG-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):
- 1.5A
- Rds On (Typ):
- 95mOhm
- Input Type:
- Inverting
- Features:
- Load Discharge, 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
AP2181DWG-7 FAQ
1.How can I place an order for AP2181DWG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2181DWG-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 AP2181DWG-7 reliable?
The price and inventory of AP2181DWG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2181DWG-7 is usually 5 days.
3.What payment methods are accepted for AP2181DWG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2181DWG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2181DWG-7?
AP2181DWG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2181DWG-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 AP2181DWG-7?
For technical support, including AP2181DWG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2181DWG-7 requirements.
6.How does Aetrix verify that AP2181DWG-7 is sourced from the original manufacturer or authorized distributors?
All AP2181DWG-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 AP2181DWG-7 meets industry standards.
7.What is the process for return or replacement of AP2181DWG-7?
All AP2181DWG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP2181DWG-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 AP2181DWG-7 part is unused and in its original packaging.
Return procedure for AP2181DWG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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