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Diodes Incorporated AP2181SG-13
- Part No.:
- AP2181SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP2181SG-13.pdf
- Description:
- IC PWR SWITCH P-CHANNEL 1:1 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,844
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Product details
Overview
AP2181SG-13 from Diodes Incorporated is a single-channel, active-low high-side USB power switch optimized for hot-swap and USB 2.0 port protection. It delivers 1.5A continuous load current with 2.1A accurate current limiting, 95mΩ RDS(ON) at +25°C, and integrated short-circuit/thermal protection. Used in laptop USB hubs and set-top-box downstream ports to prevent bus overloads and enable safe peripheral insertion.
For engineers reviewing the AP2181SG-13 datasheet, AP2181SG-13 pinout, AP2181SG-13 application, or AP2181SG-13 equivalent, key selection criteria include enable polarity (active-low), fault flag deglitch timing (7ms typ), reverse current blocking, UVLO threshold (1.9V typ), and SO-8 package thermal resistance (110°C/W).
Technical Context
The AP2181SG-13 integrates a precision current-sense FET and thermal shutdown circuitry that activates at +140°C with +25°C hysteresis. Its controlled 0.6ms typical rise time and 7ms FLG deglitch window eliminate false over-current reporting during capacitive load turn-on.
It operates across 2.7V–5.5V input range, features under-voltage lockout (UVLO) at 1.9V, and blocks reverse current when disabled. The open-drain FLG output asserts low only after sustained over-current or over-temperature events, not transient inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit (typ) | 2.1A - sets maximum safe output current before clamping; enables robust short-circuit handling without external sensing resistors |
| RDS(ON) (25°C) | 95mΩ - minimizes conduction loss and self-heating at 1.5A, supporting SO-8 package operation up to +85°C ambient |
| Input Voltage Range | 2.7V–5.5V - matches USB 2.0 VBUS tolerance and supports wide-input industrial 3.3V/5V systems |
| Enable Polarity | Active Low - simplifies interface with host controllers asserting low-enable signals during port reset or suspend |
| FLG Blanking Time | 7ms (typ) - suppresses false fault reports from capacitor inrush transients; no external RC filter required |
| Shutdown Current | 1µA (max) - enables ultra-low-power system standby states without compromising port readiness |
| Reverse Current Blocking | Yes - prevents backfeed from powered loads into upstream supply during disable, critical for multi-rail USB systems |
Pinout & Package
AP2181SG-13 is supplied in SO-8 package with exposed pad (non-electrical ground path). Thermal pad must be connected to PCB GND plane via thermal vias for optimal junction-to-ambient dissipation (θJA = 110°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for internal current sense and thermal sensor; connects to PCB ground plane |
| IN | Power input | Accepts 2.7V–5.5V supply; all IN pins (2 & 3) must be externally tied together |
| EN | Enable control | Active-low logic input; pulls low to enable switch; compatible with 0.8V max VIL and 2.0V min VIH |
| FLG | Fault indicator | Open-drain output; sinks current when over-current or over-temperature occurs after 7ms deglitch |
| OUT | Switched output | Delivers regulated current to load; all OUT pins (6 & 7) must be externally tied together |
| NC | No connection | Pin 8 has no internal bond; recommended to tie to OUT for EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| USB 2.0 Compliance | Fully compliant with USB 2.0 power delivery and hot-swap requirements, including current-limit reporting and fault signaling |
| Controlled Rise Time | 0.6ms typical - limits inrush dI/dt to <100A/s, preventing voltage droop on shared VBUS rails |
| Integrated UVLO | 1.9V threshold - ensures switch remains off until stable VBUS is established, enabling safe hot-plug detection |
| ESD Robustness | 4kV HBM - protects against electrostatic discharge during board handling and connector mating |
| Green Packaging | Halogen- and antimony-free, RoHS-compliant molding compound (<900ppm Br/Cl, <1000ppm Sb) |
Applications
| USB Host Port Protection | Laptop Docking Station Power Switching |
|---|---|
|
Use Scenario: Protecting individual downstream USB ports on a desktop motherboard from over-current faults caused by misbehaving peripherals. IC Role / Device Role / Timing Role: High-side power switch with current-limiting and FLG reporting; enables host controller to disable faulty port without resetting entire hub. Use Value: Prevents VBUS collapse across all ports, maintains enumeration of functional devices, and satisfies USB 2.0 compliance reporting requirements. |
Use Scenario: Managing power delivery to USB-C expansion modules in portable docking stations where hot-plug reliability is critical. IC Role / Device Role / Timing Role: Active-low enable switch with 0.6ms controlled rise time; synchronizes power ramp with FPGA configuration and PHY initialization. Use Value: Eliminates inrush-induced brownouts during module insertion, avoids system reset, and supports seamless plug-and-play user experience. |
| Set-Top Box USB Peripheral Interface | Industrial Human-Machine Interface (HMI) Panel |
|
Use Scenario: Isolating USB-powered accessories (e.g., wireless keyboard dongles, storage drives) in consumer STBs operating in uncontrolled thermal environments. IC Role / Device Role / Timing Role: Thermally protected high-side switch with +140°C shutdown and +25°C hysteresis; monitors die temperature independent of ambient sensors. Use Value: Prevents thermal runaway during extended video playback with attached peripherals, ensuring field-reliable operation without derating. |
Use Scenario: Securing USB OTG connectivity on ruggedized HMI panels deployed in factory automation cabinets with variable ambient temperatures (−40°C to +85°C). IC Role / Device Role / Timing Role: Reverse-current-blocking switch with −40°C to +85°C guaranteed operation; maintains isolation when external 5V supply is removed while panel remains powered. Use Value: Avoids backfeed into isolated 3.3V logic rails, preserves firmware integrity during maintenance, and meets IEC60950-1 safety certification. |
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 |
|---|---|---|---|
| AP2191SG-13 | Identical specs except EN pin is active-high; same SO-8 package, RDS(ON), current limit, and FLG behavior | Requires host MCU GPIO configured for active-high enable instead of active-low | Select when system logic naturally drives high-enable signals or shares firmware with AP2191-based designs |
| TCK112G,LF | Lower 1.2A current limit; 130mΩ RDS(ON); no UVLO; 10ms FLG blanking; same SO-8 footprint | Lacks USB 2.0 compliance features and thermal hysteresis; suited for non-USB 5V rail switching | Choose only for cost-sensitive, non-USB applications where 1.2A and simplified protection suffice |
Compared with AP2191SG-13, AP2181SG-13 offers identical protection and performance but requires inverted enable logic; versus TCK112G, it provides higher current capability, tighter current limit accuracy, USB-compliant UVLO, and superior thermal management-making it the only choice for certified USB 2.0 port designs.
Availability
AP2181SG-13 is available at Aetrix Electronics and suitable for USB host port protection, laptop docking station power switching, and industrial HMI panel designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AP2181SG-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 high-volume electronics markets.
The AP2181 belongs to Diodes' USB Power Switch product line, engineered specifically for robust, standards-compliant hot-swap protection in consumer, computing, and communications equipment with minimal external components.
FAQ
What is the function of the NC pin on AP2181SG-13?
Pin 8 is designated NC (No Connection) and has no internal bond wire or silicon connection. Diodes Incorporated recommends tying this pin to the OUT net on the PCB to reduce electromagnetic interference and improve thermal coupling to the output copper pour. It must not be left floating in high-noise environments.
Does AP2181SG-13 support reverse voltage protection?
Yes - the device blocks reverse current flow from OUT to IN when disabled, preventing backfeed into upstream supplies. This is achieved through internal MOSFET body diode orientation and gate control logic; no external Schottky diode is required for basic reverse blocking.
Can AP2181SG-13 drive a 2.2µF ceramic output capacitor without triggering FLG?
Yes - the 7ms FLG deglitch timeout is designed to ignore inrush currents from typical USB output capacitance (≤2.2µF ceramic + bulk electrolytic). With CL = 2.2µF and RLOAD = 10Ω, measured inrush duration is <1ms, well below the deglitch window.
What is the maximum continuous output current at +70°C ambient in SO-8 package?
At +70°C ambient, the SO-8 package's θJA = 110°C/W and RDS(ON) ≤ 115mΩ yield a maximum continuous output current of 1.5A - matching the datasheet's rated IOUT specification and validated across full temperature range per Recommended Operating Conditions.
AP2181SG-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:
- 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-SOP
AP2181SG-13 FAQ
1.How can I place an order for AP2181SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2181SG-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 AP2181SG-13 reliable?
The price and inventory of AP2181SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2181SG-13 is usually 5 days.
3.What payment methods are accepted for AP2181SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2181SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2181SG-13?
AP2181SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2181SG-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 AP2181SG-13?
For technical support, including AP2181SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2181SG-13 requirements.
6.How does Aetrix verify that AP2181SG-13 is sourced from the original manufacturer or authorized distributors?
All AP2181SG-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 AP2181SG-13 meets industry standards.
7.What is the process for return or replacement of AP2181SG-13?
All AP2181SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP2181SG-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 AP2181SG-13 part is unused and in its original packaging.
Return procedure for AP2181SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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