PI3USB9281CXWEX - USB Port Protection & Charger Detect | Diodes Inc.
MPN: PI3USB9281CXWEX β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.74 | $1.74 |
| 10 | $1.57 | $15.70 |
| 100 | $1.4 | $140.00 |
| 500 | $1.2 | $600.00 |
| 1,000 | $1.05 | $1,050.00 |
Drop-in alternatives for PI3USB9281CXWEX β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PI3USB9281AXWEX
β Drop-Inπ Reference alternative (not in catalog)
PI3USB9281CXWEX Maximum Ratings & Electrical Characteristics
| Function | USB 2.0 Port Detection with Port Protection |
| Charger Detection | Yes - various market chargers, MHL, OTG, car chargers per CEA936 |
| Integrated Power Switch | Yes, with over-voltage and over-current protection |
| VBUSIN Pin Tolerance | Up to 28 V |
| USB-PD Compatibility | Supports USB 3.0 PowerDelivery environments (VBUS to 20 V) |
| Operating Temperature Range | Up to +85 C |
| Package | 20-UQFN (3x4 mm) Exposed Pad |
| Mounting Type | Surface Mount |
PI3USB9281CXWEX 20-uqfn (3x4 mm) exposed pad Pin Configuration Guide
Complete pinout information for PI3USB9281CXWEX (20-uqfn (3x4 mm) exposed pad package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for PI3USB9281CXWEX.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
PI3USB9281CXWEX is suitable for 6 applications: Smartphone USB Charging Port, Tablet USB Charging and Accessory Detection, Notebook / Ultrabook USB Charging Port, Digital Camera USB Port, Power Bank and Portable Charger Input, In-Vehicle USB Charging Module.
Smartphone USB Charging Port
Smartphones rely on the micro-USB or USB-C connector both for data and for charging the integrated Li-ion battery, making the port the single most fault-exposed interface on the device. The PI3USB9281CXWEX fits this role because it detects every common charger type available in the market, including MHL accessories, OTG accessories, and car chargers per the CEA936 specification, allowing the phone to configure the correct charge current automatically. Its integrated power switch adds over-voltage and over-current protection directly at the port, and the 28V-tolerant VBUSIN pin provides the headroom needed for USB 3.0 PowerDelivery environments where VBUS reaches 20V. Placed between the connector and the charge path with datasheet-recommended capacitance, it prevents fault voltage from reaching the battery charger IC while reporting accessory type to the application processor.
Recommended
Tablet USB Charging and Accessory Detection
Tablets draw higher charge currents than phones and are frequently connected to third-party chargers, car chargers, and OTG accessories, so accurate charger detection directly determines charging speed and safety. The PI3USB9281CXWEX addresses this by enumerating the attached accessory type - market chargers, MHL, OTG, and CEA936 car chargers - and reporting it to the system controller so the correct charging profile is selected. The integrated power switch with over-voltage and over-current protection guards the Li-ion charge input against damaged or counterfeit chargers, and the 28V VBUSIN tolerance keeps the port protected even if a USB 3.0 PowerDelivery source negotiates up to 20V. Operating up to +85C ambient covers typical tablet thermal environments, and the compact 20-UQFN (3x4 mm) footprint suits densely packed main boards.
Recommended
Notebook / Ultrabook USB Charging Port
Notebooks with integrated Li-ion batteries that charge via USB connectors - the exact use case cited in the manufacturer datasheet - need robust port front-ends because the notebook may act as both host and charging sink. The PI3USB9281CXWEX provides the detection state machine for market chargers, MHL and OTG accessories, and CEA936 car chargers, while its integrated power switch with over-voltage and over-current protection isolates faults at the connector. The 28V-tolerant VBUSIN input is particularly valuable here because notebooks increasingly participate in USB 3.0 PowerDelivery ecosystems where VBUS can reach 20V. Operating up to +85C and packaged in a 20-UQFN (3x4 mm) exposed-pad package, it integrates into the notebook's power-distribution area near the connector with minimal board space and supports the port-detection signaling expected by the embedded controller.
Recommended
Digital Camera USB Port
Digital cameras charge their Li-ion batteries via USB and simultaneously support OTG accessories for media transfer, making charger and accessory detection a core requirement of the camera's port circuitry. The PI3USB9281CXWEX detects the chargers and accessories attached to the port - including MHL accessories for TV output and CEA936 car chargers for in-vehicle charging - and its integrated power switch provides over-voltage and over-current protection against damaged cables and chargers. The 28V VBUSIN tolerance protects the camera's charge input if a USB 3.0 PowerDelivery source is connected, and operation up to +85C covers typical consumer usage. The small 20-UQFN (3x4 mm) package fits the compact camera main board, placed between the USB connector and the charge-management circuit per the datasheet application schematic.
Recommended
Power Bank and Portable Charger Input
Power banks accept charge from arbitrary USB sources - wall chargers, car chargers, and PC ports - so the input stage must identify the source and protect the internal Li-ion cells and boost-charge circuitry. The PI3USB9281CXWEX performs this detection across the full range of market charger types, including OTG detection for the discharge path and CEA936 car-charger detection, while the integrated power switch with over-voltage and over-current protection blocks fault voltages before they reach the charging IC. The 28V-tolerant VBUSIN pin gives the margin required for USB 3.0 PowerDelivery sources operating at up to 20V, an increasingly common input on modern power banks. In the 20-UQFN (3x4 mm) exposed-pad package with operation to +85C, it sits directly at the USB input connector with minimal board area impact.
Recommended
In-Vehicle USB Charging Module
Automotive and aftermarket USB charging modules face harsh input conditions: long inductive cables, load dump on the vehicle rail, and a wide variety of consumer devices expecting specific charging signatures. The PI3USB9281CXWEX supports car-charger detection per the CEA936 specification, so attached phones and tablets recognize the port as a dedicated charging source and draw maximum allowed current. Its integrated power switch with over-voltage and over-current protection, combined with a VBUSIN tolerance of up to 28V for USB 3.0 PowerDelivery environments, protects downstream circuitry from vehicle transients and from PowerDelivery-capable devices negotiating up to 20V. Operation up to +85C and the compact 20-UQFN (3x4 mm) exposed-pad package suit enclosed charging-module designs, where the IC is placed at the USB receptacle output ahead of the charging converter.
Recommended
Recommended Products Summary
Engineering reference data for PI3USB9281CXWEX β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PI3USB9281AXWEX | PI3USB9281CGEEX |
|---|---|---|---|
| Package | 20-UQFN (3x4 mm) Exposed Pad | 20-UQFN (3x4 mm) Exposed Pad - same | [DATA_NEEDED] - different suffix package |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated |
| VBUSIN Tolerance | Up to 28 V | [DATA_NEEDED - confirm A-version datasheet] | Up to 28 V (same C-version die) |
| Charger Detection | Market chargers, MHL, OTG, car chargers per CEA936 | Charger detection per A-version datasheet | Same as PI3USB9281CXWEX |
| Integrated Power Switch with OVP/OCP | Yes | Yes | Yes |
| Operating Temperature | Up to +85 C | [DATA_NEEDED] | Up to +85 C |
| USB 3.0 PowerDelivery Support | Yes (28V VBUSIN headroom) | [DATA_NEEDED] | Yes |
| Drop-In Footprint Compatible | Reference | Yes - same 20-UQFN footprint | No - different package suffix |
Key Differentiators
- 28V-tolerant VBUSIN for USB PowerDelivery (vs PI3USB9281AXWEX)
- Fully integrated protection switch (vs PI3USB9281CGEEX)
- Comprehensive accessory detection (vs PI3USB9281AXWEX)
Design Notes
Place the PI3USB9281CXWEX as close to the USB connector as possible so the integrated power switch interrupts the VBUS path before any downstream circuitry. The exposed pad of the 20-UQFN (3x4 mm) package should be soldered to a ground pour with an adequate via array - it serves as the primary thermal and ground return path. Keep the VBUSIN trace wide enough for the maximum configured charge current and follow the manufacturer datasheet's recommended external capacitor values on VBUS IN and VBUS OUT.
Do not assume the A-version (PI3USB9281AXWEX) carries the same 28V VBUSIN tolerance as the C-version. The 28V rating exists specifically to survive USB 3.0 PowerDelivery environments where VBUS reaches 20V; substituting the A-version in a PowerDelivery design without verifying its rating risks over-voltage damage to the protection switch. Additionally, detection of MHL and CEA936 car chargers depends on correct ID-pin resistor networks - copy these directly from the datasheet application circuit.
Estimated: the on-chip power switch dissipates I^2 x Rds(on) during charging; because the switch on-resistance value is not present in the verified data, compute dissipation from the datasheet Rds(on) at your specific charge current before finalizing the thermal design. For a 2A charge current the copper pour under the exposed pad must keep the junction within the rated operating range up to +85C ambient. Verify OCP threshold settings so legitimate high-current chargers are not falsely tripped.
Compliance Information
Compliance data was not present in the verified web data. The 'EX' suffix in Diodes Incorporated part numbering conventionally indicates lead-free/RoHS packaging, but this must be confirmed on the manufacturer product page before being treated as verified.
