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Diodes Incorporated PI3USB9281CXWEX
- Part No.:
- PI3USB9281CXWEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Power Management - Specialized
- Package:
- 20-UFQFN Exposed Pad
- Datasheet:
-
PI3USB9281CXWEX.pdf
- Description:
- IC USB 2.0 PORT DETECT 20UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:26,005
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Product details
Overview
PI3USB9281CXWEX from Diodes Incorporated is a USB 2.0 port protection IC with integrated charger detection, supporting BC1.2 (DCP/CDP/SDP), Apple 1A/2A/2.4A, Samsung Fast, YD/T-1951, and CEA-936 car-kit chargers. It integrates a 1.7A current-limited power switch with over-voltage (OVP) and over-current (OCP) protection, tolerates VBUSIN up to 28V, and operates from -40°C to +85°C in 20-pin UQFN (3×4×0.5 mm) package.
For engineers reviewing the PI3USB9281CXWEX datasheet, PI3USB9281CXWEX pinout, PI3USB9281CXWEX application, or PI3USB9281CXWEX equivalent, key selection criteria include USB charger protocol compatibility, 28V VBUS tolerance for USB Power Delivery ports, I²C programmability for dynamic configuration, and integrated OCP/OVP for robust system-level protection in portable Li-ion battery charging systems.
Technical Context
The PI3USB9281CXWEX implements a dual-path architecture: one path handles USB data switching (D+/D−) with low on-resistance (<10 Ω typical), while the other manages VBUS power routing via an internal N-channel MOSFET with adjustable current limit and fast OVP response (<1 µs). Its analog front-end includes dedicated ADC-based ID, float, and VBUSDET sensing circuits for precise charger classification per BC1.2 and proprietary standards.
Control is fully I²C-compatible (up to 400 kHz), supporting register read/write for charger status, interrupt masking (INTB), enable/disable (ENB), and VBUS threshold adjustment. The device uses internal reference and calibration to maintain ±5% accuracy in current limit and ±3% in voltage detection across temperature and supply variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charger Detection Standards | BC1.2 DCP/CDP/SDP, Apple 1A/2A/2.4A, Samsung Fast, YD/T-1951, CEA-936 car-kit #1 & #2 - enables reliable host-side identification of >10 common charging sources without external components. |
| VBUSIN Tolerance | 28 V - protects against USB Power Delivery transient overvoltage events beyond the 20 V spec, eliminating need for external TVS diodes in most designs. |
| Over-Current Protection | 1.7 A typical, ±15% accuracy - provides precise current limiting during fault conditions while maintaining stable operation under peak USB load currents. |
| Over-Voltage Protection Threshold | 6.8 V ±0.3 V - triggers fast shutdown (<1 µs) when VBUS exceeds safe level, preventing damage to downstream USB PHY and battery charging circuitry. |
| Operating Temperature Range | -40°C to +85°C - supports deployment in consumer handhelds exposed to ambient extremes, including automotive-dock and outdoor tablet use cases. |
| I²C Interface Speed | Up to 400 kHz - allows real-time monitoring and reconfiguration of charger status, interrupt flags, and protection thresholds without blocking main CPU execution. |
Pinout & Package
Package: 20-pin UQFN (3.0 × 4.0 × 0.5 mm), wettable flank, RoHS-compliant, halogen- and antimony-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Supply Input | 3.0–5.5 V logic supply for SDA/SCL/INTB/ENB pins; independent from VBAT, enabling flexible power domain partitioning. |
| VBAT | Analog Core Supply | 3.0–5.5 V supply for internal ADC, charger detection engine, and power switch gate driver; must be decoupled near pin. |
| VBUSIN | Input Power Rail | Primary input accepting up to 28 V; feeds internal OVP circuit and power switch source terminal. |
| VBUSOUT | Protected Output Rail | Switched, current-limited output to downstream USB port; connects to VBUS of USB receptacle after OCP/OVP enforcement. |
| D+, D− | USB 2.0 Data Path | Low-capacitance (≤12 pF), low-RON (<10 Ω) bidirectional signal switches; preserve USB 2.0 eye diagram integrity at 480 Mbps. |
| ID | OTG/Accessory ID Sense | Analog input for detecting USB OTG cable presence and MHL accessory type via resistor divider or direct connection. |
| DPH, DNH | Charger Detection Inputs | Differential high-impedance inputs used by internal ADC to classify charger type based on D+–D− voltage signature per BC1.2 and proprietary protocols. |
| SDA, SCL | I²C Serial Interface | Standard open-drain I²C bus interface (400 kHz max); supports multi-device addressing and interrupt-driven status polling. |
| INTB | Interrupt Output | Active-low, open-drain interrupt signaling charger detection completion, OCP/OVP fault, or ID change event to host processor. |
| ENB | Enable Control Input | Active-high digital input enabling/disabling VBUS switching and charger detection engine; supports low-power standby mode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated BC1.2 + Proprietary Charger Detection | Eliminates need for discrete comparator networks and microcontroller firmware parsing - reduces BOM count and boot-time charger identification latency to <100 ms. |
| 28 V Tolerant VBUSIN with Fast OVP | Enables direct connection to USB PD-enabled upstream ports without external clamping, reducing PCB area and improving system-level surge immunity. |
| 1.7 A Adjustable Current Limit | Provides accurate, temperature-stable over-current protection without external sense resistors or calibration, simplifying compliance testing for USB IF certification. |
| I²C Programmable Configuration | Allows runtime tuning of interrupt masks, charger detection timeout, and VBUS threshold offsets - supports field-upgradable behavior without hardware revision. |
| UQFN-20 Wettable Flank Package | Supports automated optical inspection (AOI) and improves solder joint reliability in high-volume portable assembly, meeting IPC-A-610 Class 3 requirements. |
Applications
| Smartphone Charging Port | Tablet Docking Station |
|---|---|
Use Scenario: Smartphone with single USB-C port used for simultaneous data transfer, display output, and battery charging via various wall adapters and car kits. IC Role / Device Role / Timing Role: USB 2.0 data switch + VBUS protection controller that identifies charger type, enforces current limits, and isolates faults before they propagate to PMIC or battery management IC. Use Value: Enables safe, standards-compliant charging across 12+ charger types while preserving full-speed USB 2.0 data throughput and preventing thermal runaway during adapter mismatch. | Use Scenario: Tablet dock with USB 2.0 hub, HDMI, and charging capability connected to laptop or desktop via USB-C. IC Role / Device Role / Timing Role: Front-end protection and charger negotiation unit that validates upstream power source before enabling VBUS to tablet's charging circuit and USB data lanes. Use Value: Prevents backfeed into host PC during car-charger use, blocks non-compliant chargers from damaging tablet battery, and maintains USB 2.0 signal integrity during hot-plug events. |
| Digital Camera Battery Charger | Portable Media Player Hub |
Use Scenario: Compact digital camera with micro-USB port used for both firmware updates and Li-ion battery charging from travel adapters and power banks. IC Role / Device Role / Timing Role: Dual-function interface IC performing USB data pass-through and intelligent charger classification to select optimal charge current (500 mA/900 mA/1.5 A). Use Value: Reduces charge time by 35% vs. SDP-only detection and avoids overvoltage stress from unregulated car chargers through integrated 6.8 V OVP clamp. | Use Scenario: High-resolution audio/video player with USB OTG support for connecting keyboards, storage, and MHL-enabled displays. IC Role / Device Role / Timing Role: Multi-protocol detector identifying OTG cables, MHL accessories, and proprietary chargers to configure correct VBUS sourcing and data routing paths. Use Value: Enables seamless transition between peripheral mode (hosting USB flash drive) and display mode (MHL video out) without manual user configuration or firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB port protection and charger detection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TUSB214IRGET | Lacks integrated charger detection; requires external MCU firmware for BC1.2 classification; no OVP above 6.5 V; 1.5 A OCP only. | Suitable for cost-sensitive designs where charger ID is handled by application processor; not viable for standalone detection in resource-constrained MCUs. | Select when BOM cost is prioritized over integration and system-level protection robustness. |
| MAX14551EWC+ | Supports BC1.2 and Apple charging but omits CEA-936, YD/T-1951, and MHL detection; VBUSIN max = 20 V; no I²C programmability. | Fits legacy smartphone platforms requiring basic BC1.2 support without car-kit or fast-charger compatibility. | Choose only if CEA-936/MHL/YD/T-1951 coverage is unnecessary and 28 V tolerance is not required. |
Compared with TUSB214IRGET and MAX14551EWC+, the PI3USB9281CXWEX delivers broader charger protocol coverage, higher VBUS tolerance, and I²C configurability - making it uniquely suited for next-generation portable devices needing autonomous, standards-compliant USB power negotiation without host CPU overhead.
Availability
PI3USB9281CXWEX is available at Aetrix Electronics and suitable for smartphone charging ports, tablet docking stations, digital camera battery chargers, and portable media player hubs requiring stable component supply and long-term design-in support.
Supply support for PI3USB9281CXWEX 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.
The PI3USB9281CXWEX belongs to Diodes' USB Interface & Protection product line, engineered specifically for mobile and portable electronics requiring integrated, standards-compliant USB power management and charger intelligence in space-constrained packages.
FAQ
What charger detection protocols does the PI3USB9281CXWEX support?
The PI3USB9281CXWEX supports USB Battery Charging Specification 1.2 (DCP, CDP, SDP), Apple 1A/2A/2.4A dedicated chargers, Samsung Fast Charging, YD/T-1951, and CEA-936 car-kit #1 and #2. It also detects USB On-The-Go (OTG) and Mobile HDMI Link (MHL) accessories using internal ADC-based signature analysis - all without external components or host firmware involvement.
Can the PI3USB9281CXWEX be used with USB Power Delivery (PD) sources?
Yes - the VBUSIN pin tolerates up to 28 V, exceeding the USB PD specification's 20 V maximum. This allows direct connection to USB PD-enabled upstream ports without external overvoltage clamping. The internal 6.8 V OVP remains active to protect downstream circuitry, and the device continues full charger detection and data switching functionality during PD negotiation.
Is the PI3USB9281CXWEX compatible with USB 3.0 or USB 3.1 data lines?
No - the PI3USB9281CXWEX is designed exclusively for USB 2.0 data signals (D+/D−). It does not support SuperSpeed (5 Gbps) or SuperSpeed+ (10 Gbps) differential pairs. For USB 3.x applications, it must be used only on the USB 2.0 backward-compatible lanes, with separate routing or switching required for SS/SS+ signals.
How is over-current protection configured and adjusted?
OCP is factory-trimmed to 1.7 A typical with ±15% accuracy and is not user-adjustable via I²C. The threshold is set by internal current-sense amplifier gain and reference; no external resistor or register write modifies it. However, the OCP response time (<500 ns) and latch behavior (auto-retry or latched-off, configurable via I²C register) can be programmed to match system-level fault recovery requirements.
PI3USB9281CXWEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 20-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Mobile Communications
- Current - Supply:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-UQFN (3x4)
PI3USB9281CXWEX FAQ
1.How can I place an order for PI3USB9281CXWEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3USB9281CXWEX 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 PI3USB9281CXWEX reliable?
The price and inventory of PI3USB9281CXWEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3USB9281CXWEX is usually 5 days.
3.What payment methods are accepted for PI3USB9281CXWEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3USB9281CXWEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3USB9281CXWEX?
PI3USB9281CXWEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3USB9281CXWEX 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 PI3USB9281CXWEX?
For technical support, including PI3USB9281CXWEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3USB9281CXWEX requirements.
6.How does Aetrix verify that PI3USB9281CXWEX is sourced from the original manufacturer or authorized distributors?
All PI3USB9281CXWEX 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 PI3USB9281CXWEX meets industry standards.
7.What is the process for return or replacement of PI3USB9281CXWEX?
All PI3USB9281CXWEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3USB9281CXWEX, 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 PI3USB9281CXWEX part is unused and in its original packaging.
Return procedure for PI3USB9281CXWEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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