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Diodes Incorporated AP2181DSG-13
- Part No.:
- AP2181DSG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP2181DSG-13.pdf
- Description:
- IC PWR SWITCH P-CHANNEL 1:1 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,715
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Product details
Overview
AP2181DSG-13 from Diodes Incorporated is an active-low enable, single-channel 1.5A high-side USB power switch with integrated output discharge, 90mΩ RDS(ON), 2.1A current limiting, and 7ms deglitched fault reporting - designed for hot-swap USB 2.0 ports in laptops, docking stations, and set-top boxes.
For engineers reviewing the AP2181DSG-13 datasheet, AP2181DSG-13 pinout, AP2181DSG-13 application, or AP2181DSG-13 equivalent, key selection criteria include enable polarity (active-low), thermal shutdown threshold (140°C), output discharge resistance (100Ω), and SO-8 package compatibility with USB load-switch layout constraints.
Technical Context
This device implements a thermally protected, slew-rate-controlled N-channel MOSFET high-side switch with integrated current-sense FET, UVLO (1.9V typ), and reverse-current blocking. Its control logic activates only when EN is pulled low (AP2181D) and disables output while enabling internal 100Ω NMOS discharge path.
The FLG pin uses a dedicated 7ms deglitch timer to suppress false overcurrent alerts during capacitive inrush, and its open-drain output asserts low on either overtemperature (>140°C) or overcurrent (>2.1A). No external components are required for fault blanking or discharge timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit | 2.1A typical - clamps sustained output current to prevent damage during overload or short-circuit conditions |
| RDS(ON) | 90mΩ max (U-DFN2018-6, 5V, 25°C) - minimizes conduction loss and self-heating at 1.5A continuous load |
| Input Voltage Range | 2.7V–5.5V - supports full USB 2.0 bus voltage range including degraded or battery-backed supplies |
| Enable Polarity | Active-low - matches legacy USB hub control logic requiring low-asserted enable for port power-up |
| Output Discharge | 100Ω internal NMOS - discharges output capacitance to <0.5V within 0.6ms (with 10µF load), eliminating floating voltage after disable |
| FLG Blanking Time | 7ms typical - prevents false fault reporting during transient inrush into 120µF output caps without external RC network |
| Thermal Shutdown | 140°C trip with 25°C hysteresis - cycles output until fault removal, protecting die under sustained short-circuit stress |
Pinout & Package
AP2181DSG-13 is supplied in SO-8 package (lead-free, RoHS-compliant, "Green" molding compound). Pin 1 = NC (tie to OUT), Pin 2/3 = IN (must be externally shorted), Pin 4 = EN (active-low), Pin 5 = FLG (open-drain fault flag), Pin 6/7 = OUT (must be externally shorted), Pin 8 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 2,3) | Power Input | Primary supply input; all IN pins must be tied together externally to ensure uniform gate drive and current sharing |
| EN (Pin 4) | Enable Control | Active-low digital input; pulling low enables switch; high-Z state disables output and activates discharge path |
| FLG (Pin 5) | Fault Reporting | Open-drain output asserted low during overcurrent or overtemperature; 7ms deglitch prevents false triggers on startup |
| OUT (Pins 6,7) | Switched Output | High-side switched output; all OUT pins must be tied together externally to share current and reduce parasitic inductance |
| GND (Pin 8) | Ground Reference | Power and signal ground reference; connects to PCB ground plane for thermal and EMI performance |
| NC (Pin 1) | No Connect | Internally unconnected; recommended to tie to OUT for mechanical stability and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Reverse Current Blocking | Prevents backflow from output to input when VOUT > VIN - eliminates need for external blocking diode in shared-bus systems |
| Controlled Rise Time | 0.6ms typical (CL = 1µF, RL = 10Ω) - limits inrush current to protect upstream source and downstream capacitors |
| Ultra-Low Shutdown Current | 1µA max at TA = 85°C - enables energy-sensitive applications like portable USB hubs and always-on peripherals |
| Integrated UVLO | 1.9V typical turn-on threshold - ensures switch remains off until input rail stabilizes, preventing brown-out misoperation |
| ESD Robustness | 4kV HBM, 300V MM - meets IEC 61000-4-2 system-level ESD requirements for consumer-facing USB ports |
Applications
| USB 2.0 Port Power Switching | Laptop Docking Station Load Management |
|---|---|
|
Use Scenario: Individual USB port power control in multi-port hubs where each port requires independent overcurrent protection and hot-plug sequencing. IC Role / Device Role / Timing Role: High-side power switch with active-low enable and 7ms fault blanking - manages inrush, blocks reverse current, and reports faults without host intervention. Use Value: Eliminates need for discrete MOSFET + controller + sense resistor + RC filter, reducing BOM count by ≥4 components per port. |
Use Scenario: Isolating auxiliary peripherals (e.g., Ethernet, HDMI, SD card) from main laptop power rail during hot insertion/removal. IC Role / Device Role / Timing Role: Hot-swap controller with controlled 0.6ms rise time and 100Ω discharge - prevents bus glitches and residual voltage on disconnected modules. Use Value: Enables safe live module replacement without system reboot or manual power cycling, meeting USB-IF hot-plug compliance. |
| Set-Top Box USB Peripheral Protection | Smartphone Charging Port Isolation |
|
Use Scenario: Protecting USB host ports in cable/satellite STBs from short circuits caused by low-cost or damaged peripherals (keyboards, flash drives). IC Role / Device Role / Timing Role: Current-limited power switch with 2.1A trip threshold and thermal foldback - sustains brief overloads while shutting down persistent faults. Use Value: Prevents system reset or power rail collapse during peripheral failure, improving field reliability and user experience. |
Use Scenario: Isolating USB data/power lines between smartphone SoC and external charging accessories to prevent backfeed or latch-up. IC Role / Device Role / Timing Role: Reverse-current blocking high-side switch with 100Ω discharge - stops battery discharge through USB VBUS when accessory is unplugged. Use Value: Extends standby battery life by eliminating parasitic discharge paths, critical for always-connected mobile devices. |
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 |
|---|---|---|---|
| TCK107AG,118 (Nexperia) | Active-high enable, 1.8A limit, 110mΩ RDS(ON), no integrated discharge | Requires external discharge circuit for same functionality; better suited for space-constrained designs needing active-high logic interface | Select if system MCU outputs active-high enable signals and board area permits adding 100Ω discharge resistor + MOSFET |
| TPS2051BDR (TI) | 1.5A limit, 120mΩ RDS(ON), 2.5ms FLG blanking, no reverse-current blocking | Lacks reverse-current protection - mandates external Schottky diode; higher RDS(ON) increases conduction loss at 1.5A | Choose only if existing design already includes reverse-blocking diode and TI's ecosystem support is prioritized over thermal efficiency |
Compared with TCK107AG,118 and TPS2051BDR, AP2181DSG-13 delivers lower conduction loss (90mΩ), integrated discharge (no BOM addition), and reverse-current blocking - making it optimal for compact, cost-sensitive USB 2.0 hot-swap implementations where active-low control is available.
Availability
AP2181DSG-13 is available at Aetrix Electronics and suitable for USB 2.0 port protection, laptop docking station power management, and set-top box peripheral isolation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AP2181DSG-13 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 power management, signal integrity, and protection solutions for consumer, computing, and industrial markets.
The AP2181D/AP2191D series targets USB-compliant hot-swap applications, delivering integrated protection (UVLO, current limit, thermal shutdown) and ease-of-use (no external components needed) in space-constrained designs.
FAQ
What is the maximum continuous output current rating for AP2181DSG-13?
The AP2181DSG-13 is rated for 1.5A maximum continuous output current per the datasheet's Recommended Operating Conditions. Its 2.1A current-limit threshold provides headroom for transient surges, but sustained operation above 1.5A risks thermal shutdown depending on PCB layout and ambient temperature.
Does AP2181DSG-13 require external components for fault blanking or output discharge?
No. The 7ms FLG deglitch timer and 100Ω internal discharge NMOS are fully integrated - no external RC network or discharge transistor is needed. This reduces bill-of-materials count and improves layout simplicity versus discrete alternatives.
Can AP2181DSG-13 be used in USB-C applications?
No. AP2181DSG-13 is specified only for USB 2.0 (5V-only) operation and lacks the voltage rating, current capability, and CC logic interface required for USB-C. It is not rated for 20V operation or bidirectional power delivery protocols.
How does the reverse-current blocking function operate in AP2181DSG-13?
When the switch is disabled and VOUT exceeds VIN (e.g., due to backfeed from a charged capacitor or powered peripheral), an internal circuit actively blocks current flow from OUT to IN - eliminating the need for an external Schottky diode and associated forward-voltage drop.
AP2181DSG-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SO
AP2181DSG-13 FAQ
1.How can I place an order for AP2181DSG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2181DSG-13 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 AP2181DSG-13 reliable?
The price and inventory of AP2181DSG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2181DSG-13 is usually 5 days.
3.What payment methods are accepted for AP2181DSG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2181DSG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2181DSG-13?
AP2181DSG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2181DSG-13 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 AP2181DSG-13?
For technical support, including AP2181DSG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2181DSG-13 requirements.
6.How does Aetrix verify that AP2181DSG-13 is sourced from the original manufacturer or authorized distributors?
All AP2181DSG-13 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 AP2181DSG-13 meets industry standards.
7.What is the process for return or replacement of AP2181DSG-13?
All AP2181DSG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP2181DSG-13, 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 AP2181DSG-13 part is unused and in its original packaging.
Return procedure for AP2181DSG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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