My Inquiry
My Account
Diodes Incorporated AP2181FMG-7
- Part No.:
- AP2181FMG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
AP2181FMG-7.pdf
- Description:
- IC PWR SWITCH P-CHANNEL 1:1 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,136
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP2181FMG-7 from Diodes Incorporated is a single-channel, active-low high-side USB power switch with 2.1A current limiting, 95mΩ RDS(ON) at 5V, and integrated short-circuit/thermal protection. It operates from 2.7V–5.5V input, features 0.6ms typical rise time and 7ms FLG deglitch, and is used in USB 2.0 hot-swap ports on laptops, docking stations, and set-top boxes.
For engineers reviewing the AP2181FMG-7 datasheet, AP2181FMG-7 pinout, AP2181FMG-7 application, or AP2181FMG-7 equivalent, key selection criteria include enable polarity (active-low), thermal shutdown threshold (+140°C), reverse current blocking, UVLO (1.9V typ), and U-DFN2018-6 package compatibility with space-constrained USB port designs.
Technical Context
The AP2181FMG-7 integrates a low-RDS(ON) N-channel MOSFET with precision current-sense FET architecture for accurate 2.1A over-current limiting without external resistors. Its internal deglitch circuit suppresses false FLG assertions during capacitive inrush transients.
It implements dual-protection hierarchy: immediate current limiting upon overload detection (ILIMIT = 2.1A), followed by thermal shutdown at +140°C with +25°C hysteresis. UVLO ensures switch remains off until VIN ≥ 1.9V, enabling safe hot-plug operation in host/self-powered USB hubs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit | 2.1A typical - clamps output current to prevent damage during sustained overload or short-circuit conditions |
| RDS(ON) | 90mΩ max (U-DFN2018-6, 25°C, VIN=5V) - minimizes conduction loss and self-heating under 1.5A continuous load |
| Input Voltage Range | 2.7V–5.5V - supports full USB 2.0 bus voltage range including worst-case droop scenarios |
| Enable Polarity | Active-low - simplifies interface with USB controller GPIOs that assert low to enable port power |
| FLG Blanking Time | 7ms typical - eliminates false fault reporting during normal 100µF output capacitor charging transients |
| Thermal Shutdown | +140°C trip with +25°C hysteresis - enables automatic recovery after fault removal without system reset |
| Reverse Current Blocking | Enabled when disabled - prevents backflow from VOUT to VIN, critical for multi-rail systems with shared supplies |
Pinout & Package
AP2181FMG-7 is packaged in U-DFN2018-6 (2.0mm × 1.8mm, 0.5mm pitch), featuring an exposed thermal pad connected to GND for enhanced thermal dissipation (θJA = 70°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Primary return path for power and logic; must be connected to PCB ground plane with thermal vias |
| 2 (IN) | Power input | Accepts 2.7V–5.5V supply; requires local 0.01–0.1µF ceramic bypass capacitor |
| 3 (EN) | Enable control | Active-low logic input; pulled high internally; drives low to activate switch |
| 4 (FLG) | Fault reporting | Open-drain output asserted low during over-current or thermal fault; 7ms deglitch built-in |
| 5,6 (OUT) | Power output | Switched output to USB port load; both pins must be tied together externally |
Key Features
| Feature | Design Value |
|---|---|
| USB 2.0 Compliance | Meets electrical timing and protection requirements for standard downstream USB ports |
| Controlled Rise Time | 0.6ms typical - limits inrush current to <1.5A during hot-plug, reducing stress on upstream supply |
| No External Components Required | Integrated deglitch, UVLO, and current sense eliminate need for external RC networks or sense resistors |
| Low Shutdown Current | 1µA max - enables ultra-low-power standby in battery-backed or always-on USB hub applications |
| ESD Robustness | 4kV HBM - protects against handling ESD events during assembly and field service |
Applications
| USB Host Port Protection | Self-Powered Hub Port |
|---|---|
|
Use Scenario: Single USB 2.0 downstream port on a desktop PC motherboard requiring over-current protection and hot-plug compliance. IC Role / Device Role / Timing Role: High-side power switch controlling VBUS delivery; enables/disables port power under host software control with precise current limiting. Use Value: Prevents bus-wide shutdown during peripheral short-circuit faults while maintaining USB enumeration integrity via FLG-driven controller interrupt. |
Use Scenario: Downstream port on a monitor-integrated USB hub supplying power to keyboards/mice without drawing from host PC. IC Role / Device Role / Timing Role: Isolates hub's local 5V rail from individual port loads; provides independent fault reporting per port via dedicated FLG lines. Use Value: Enables per-port current limiting and thermal management, allowing hub firmware to disable only faulty ports instead of entire hub. |
| Laptop Docking Station | Set-Top Box USB Peripheral Port |
|
Use Scenario: Power switching for USB peripherals (storage, Ethernet adapters) connected via a Thunderbolt/USB-C dock. IC Role / Device Role / Timing Role: Hot-swap controller managing inrush into high-capacitance loads (e.g., 120µF SSD power rails); coordinates with system PMIC via EN/FLG handshake. Use Value: Eliminates audible relay click and voltage droop on main system rail during peripheral insertion, improving user experience. |
Use Scenario: USB port on IPTV set-top box powering streaming sticks or wireless receivers. IC Role / Device Role / Timing Role: Standalone power gate with UVLO ensuring port remains off until stable 5V rail is established post-power-on reset. Use Value: Prevents spurious device enumeration or firmware crash caused by marginal VBUS during cold start or brownout recovery. |
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 |
|---|---|---|---|
| TUSB2036IRHBR | Integrated USB 2.0 hub controller + power switches; 3-port, 100mA per port; no adjustable current limit | Requires full hub functionality; not suitable for discrete port gating | Select when needing multi-port hub logic + power control in one IC; not a drop-in replacement |
| TPS2051BDBVR | Active-high enable; 1.5A fixed current limit; 110mΩ RDS(ON); no reverse current blocking | Lacks reverse blocking and tighter current accuracy; requires external pull-up on EN | Choose for cost-sensitive designs where active-high control and relaxed current tolerance are acceptable |
Compared with TUSB2036IRHBR and TPS2051BDBVR, AP2181FMG-7 offers superior current-limit accuracy (±10% vs ±30%), reverse current blocking, and active-low enable-critical for direct integration with USB host controllers lacking dedicated enable pull-ups.
Availability
AP2181FMG-7 is available at Aetrix Electronics and suitable for USB 2.0 host ports, self-powered hubs, and docking station peripheral interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP2181FMG-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 power management, signal integrity, and protection solutions for consumer, computing, and industrial markets.
The AP2181/AP2191 family was designed specifically for USB 2.0-compliant hot-swap power distribution, emphasizing low RDS(ON), precise current limiting, and robust fault reporting in miniature packages.
FAQ
What is the maximum continuous load current supported by AP2181FMG-7?
The AP2181FMG-7 is rated for 1.5A maximum continuous load current per the manufacturer's recommended operating conditions. This value accounts for thermal derating across -40°C to +85°C ambient and ensures reliable operation without exceeding junction temperature limits under typical PCB layout conditions.
Does AP2181FMG-7 provide reverse current blocking when disabled?
Yes. When the AP2181FMG-7 is disabled (EN high), it blocks reverse current flow from OUT to IN. This is achieved through internal MOSFET body diode isolation and active gate control, preventing backfeeding into the upstream 5V rail-a requirement for systems with multiple independent power domains.
How does the 7ms FLG deglitch function interact with large output capacitors?
The 7ms deglitch window ignores transient over-current events shorter than ~4ms, allowing safe charging of up to 120µF output capacitance without false FLG assertion. This eliminates need for external RC filters while maintaining fast fault response for sustained shorts (>15ms duration).
Can AP2181FMG-7 be used in USB-C applications?
No. AP2181FMG-7 is specified only for USB 2.0 signaling and 5V-only power delivery. It lacks support for USB-C alternate modes, CC logic, or programmable power supply (PPS) negotiation. For USB-C applications, discrete power switches must be paired with dedicated USB-C controller ICs.
AP2181FMG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 6-UFDFN Exposed Pad
- 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):
- 90mOhm
- 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:
- U-DFN2018-6
AP2181FMG-7 FAQ
1.How can I place an order for AP2181FMG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2181FMG-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 AP2181FMG-7 reliable?
The price and inventory of AP2181FMG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2181FMG-7 is usually 5 days.
3.What payment methods are accepted for AP2181FMG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2181FMG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2181FMG-7?
AP2181FMG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2181FMG-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 AP2181FMG-7?
For technical support, including AP2181FMG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2181FMG-7 requirements.
6.How does Aetrix verify that AP2181FMG-7 is sourced from the original manufacturer or authorized distributors?
All AP2181FMG-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 AP2181FMG-7 meets industry standards.
7.What is the process for return or replacement of AP2181FMG-7?
All AP2181FMG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP2181FMG-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 AP2181FMG-7 part is unused and in its original packaging.
Return procedure for AP2181FMG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP2181FMG-7 Tags
-
TPS22919DCKR
Texas Instruments
-
MIC2091-1YM5-TR
Microchip Technology
-
MIC2090-1YM5-TR
Microchip Technology
-
TPS22995RZFR
Texas Instruments
-
TPS22975DSGR
Texas Instruments
-
SIP32510DT-T1-GE3
Vishay Siliconix
-
ULN2003D1013TR
STMicroelectronics
-
MIC2005A-1YM5-TR
Microchip Technology
-
MIC2005A-1YM6-TR
Microchip Technology
-
TPS22916BYFPR
Texas Instruments
-
TPS22917DBVR
Texas Instruments
-
ULN2003APWR
Texas Instruments
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
