FUSB302MPX - USB Type-C Controller with PD | onsemi
MPN: FUSB302MPX β Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
FUSB302MPX Overview
A USB Type-C controller is a dedicated interface IC that manages the CC (Configuration Channel) lines of a USB Type-C connector. In the system hierarchy, it sits between the USB power path / USB 3.1 physical connector and the host microcontroller, handling attach detection, cable orientation, role swap, and PD message negotiation so the application processor does not need to bit-bang the PD protocol.
Key features of the FUSB302MPX include full USB Type-C CC-line termination and detection, a full-featured PD PHY supporting BMC (Biphase Mark Coding) signaling on the CC line, an I2C slave interface for host control, and integrated VCONN support for powering electronically marked cables. The programmable architecture lets firmware implement sink, source, or dual-role power policies in software.
Technically, the device integrates a PD transceiver with BMC encoding/decoding, comparator-based CC voltage monitoring for attach and orientation detection, and register-based configuration accessible over I2C at up to 400 kHz clock rates. The exposed-pad MLP-14 package provides low thermal impedance and short trace lengths, which benefits CC-line signal integrity at BMC data rates. RoHS-compliant, lead-free construction supports modern environmental requirements.
Typical applications include USB Type-C power adapters and chargers, smartphone and tablet port controllers, notebook and dock power negotiation, power banks with PD sink input, and monitor or display-port alternate-mode designs. In each case the FUSB302MPX handles CC attach detection and PD contract negotiation while the system MCU manages the actual power conversion stage.
A key design consideration: onsemi explicitly recommends the FUSB302BMPX for new designs; the FUSB302B family incorporates updates aligned to later USB-C specification releases, and per onsemi the B version is a drop-in replacement requiring no software optimization.
This page adds value beyond the manufacturer datasheet by synthesizing distributor availability, drop-in alternative guidance, design notes, and comparison data in one engineer-oriented reference.
Drop-in alternatives for FUSB302MPX β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with FUSB302MPX (same form factor and footprint) β differing in Package, Packaging, USB Standard.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
FUSB302BMPX
β Drop-Inβ In Stock
$0.42 / Unit
View Datasheet βFUSB302B01MPX
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
FUSB302TMX
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
FUSB302MPX Maximum Ratings & Electrical Characteristics
| Function | Programmable USB Type-C Controller with Power Delivery |
| USB Standard | USB 3.1 |
| Interface | I2C |
| Supply Voltage Range | 2.8 V to 5.5 V |
| Package | 14-MLP (2.5x2.5 mm), Exposed Pad |
| Mounting Type | Surface Mount |
| Number of Pins | 14 |
| PD PHY | BMC signaling on CC line |
| CC Line Detection | Attach, orientation, role detection |
| VCONN Support | Yes |
| Programming | Firmware-programmable via I2C registers |
| RoHS Status | Compliant |
| Packaging | Tape and Reel (T/R) |
FUSB302MPX 14-mlp (2.5x2.5 mm), exposed pad Pin Configuration Guide
Pin configuration for FUSB302MPX (14-mlp (2.5x2.5 mm), exposed pad package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for FUSB302MPX.
Refer to the datasheet for full pin configuration.
Typical Applications
FUSB302MPX is suitable for 6 applications: USB PD Chargers and Adapters, Smartphones and Tablets USB Type-C Ports, Laptops, Docks and Hubs, Power Banks with PD Input, Monitors and Display Alternate-Mode Systems, Embedded and Development Platforms.
USB PD Chargers and Adapters
The FUSB302MPX fits USB PD charger designs because its integrated BMC PD PHY negotiates voltage and current contracts on the CC line while its 2.8V to 5.5V supply range is easily met by charger housekeeping rails. In a typical source design, the controller senses attach and cable orientation on CC1/CC2, enables VCONN for e-marked cables, and relays negotiated contracts over I2C to the system MCU, which then commands the flyback or buck power stage to the requested PD voltage. Because PD protocol timing is handled in hardware, even a small, low-cost MCU can run the complete source policy. The trade-off is firmware complexity: all policy logic lives in host code rather than in autonomous silicon, which is why onsemi recommends the FUSB302B step for new designs facing current compliance testing.
Recommended
Smartphones and Tablets USB Type-C Ports
Mobile devices were the primary target market for the FUSB302 family: the 2.5x2.5 mm 14-MLP package and low external-component count fit dense smartphone and tablet PCBs. The controller performs CC-line attach detection, orientation resolution, and role detection (sink, source, or audio accessory), and its PD PHY negotiates fast-charge contracts up to the levels allowed by the platform policy. Power consumption is minimal, preserving battery life in standby, and the I2C register interface integrates cleanly with application-processor power-management firmware. Designers should route CC1/CC2 as short matched traces to the connector to protect BMC signal integrity, and place the exposed pad on a solid ground pour. Onsemi recommends the FUSB302B variant for new mobile designs due to updated USB-C spec alignment.
Recommended
Laptops, Docks and Hubs
In notebook docking stations and USB hubs, the FUSB302MPX acts as the Type-C port controller that manages attach, orientation, and PD contract negotiation between the host and upstream power. Docks typically operate as PD sinks on the upstream port while providing source functionality downstream, and the programmable register architecture of the FUSB302MPX lets firmware implement such dual-role policies flexibly. VCONN support powers electronically marked cables so the design can source above 3A where the cable rating permits. The exposed-pad MLP-14 package provides good thermal and ground performance for continuous high-power delivery. Because PD messaging timing is handled on-chip, the dock's main MCU is relieved of real-time protocol duties, simplifying firmware architecture and reducing bill-of-material cost.
Recommended
Power Banks with PD Input
Power banks benefit from the FUSB302MPX in its sink role: the controller negotiates a PD contract with an external charger to recharge the bank's cells at the highest mutually supported voltage, then acts as a source when charging connected devices. The programmable nature of the FUSB302MPX makes role swapping straightforward, with firmware toggling CC terminations between Rd (sink) and Rp (source) via I2C registers. Its 2.8V to 5.5V operating range is compatible with the bank's boost-converter housekeeping rail. For e-marked 5A cables, VCONN output enables reading cable capability so the bank never advertises more current than the cable safely carries. Designers must ensure the CC pins are protected against ESD at the connector, per standard Type-C port requirements.
Recommended
Monitors and Display Alternate-Mode Systems
Type-C monitors use controllers like the FUSB302MPX to negotiate PD power and signal role-swap or alternate-mode intent on the CC line. While SuperMUTeCapable alternate-mode configuration typically involves a separate superspeed mux controlled by the system, the FUSB302MPX supplies the PD messaging foundation: it detects attach, resolves orientation (which the mux needs for lane steering), and negotiates the power contract that determines how many watts the monitor receives or delivers upstream. The register-level interface lets monitor firmware coordinate PD events with DisplayPort link training and mux switching. Onsemi recommends the FUSB302B step for new monitor platforms to ease USB-C compliance testing under the current specification releases.
Recommended
Embedded and Development Platforms
Single-board computers, development boards, and industrial embedded systems adopting USB Type-C ports use the FUSB302MPX as the low-cost CC and PD front end. Open-source driver libraries exist for the family, simplifying integration with Linux and RTOS hosts, and the I2C register interface means any MCU with a standard I2C peripheral can implement PD policy. The controller handles orientation detection so USB 3.1 superspeed muxes can be steered correctly, and its PD PHY negotiates input power for boards drawing 15W to 100W from PD chargers. For industrial designs, verify the operating temperature range in the current onsemi datasheet. New designs should use the FUSB302B variant per onsemi's recommendation for specification compliance.
Recommended
Recommended Products Summary
Engineering reference data for FUSB302MPX β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | FUSB302BMPX | FUSB302B01MPX | FUSB302TMX |
|---|---|---|---|---|
| Package | 14-MLP (2.5x2.5 mm), Exposed Pad | 14-MLP (2.5x2.5 mm), Exposed Pad - same | 14-MLP (2.5x2.5 mm), Exposed Pad - same | 14-MLP (2.5x2.5 mm), Exposed Pad - same |
| Brand | onsemi | onsemi | onsemi | onsemi (originally Fairchild) |
| Supply Voltage | 2.8 V to 5.5 V | 2.8 V to 5.5 V | 2.8 V to 5.5 V | 2.8 V to 5.5 V |
| USB Standard | USB 3.1 | USB 3.1 | USB 3.1 | USB 3.1 |
| PD PHY / BMC | Yes | Yes | Yes | Yes |
| USB-C Spec Alignment | Original revision (earlier spec releases) | Updated to latest spec releases | Updated to latest spec releases | Original revision |
| Recommended for New Designs | No (use B-step) | Yes | Yes | No |
Key Differentiators
- Confirmed drop-in replacement path exists (vs FUSB302BMPX)
- Fully programmable PD policy (vs FUSB302TMX)
- Compact exposed-pad MLP-14 package (vs Cross-brand Type-C controllers (e.g., ST STUSB4500, QFN-12))
Design Notes
Connect the exposed pad of the 14-MLP package to a solid ground plane through an array of 4-9 vias directly under the pad. This exposed pad is the main ground return for the PD transceiver, so a floating or poorly connected pad degrades BMC signal quality on the CC lines and can cause PD message CRC failures during negotiation. Place the 0.1uF VDD decoupling capacitor within 1-2 mm of the supply pin, and add a 1uF bulk capacitor nearby for PD burst-current transients.
Route CC1 and CC2 from the connector to the FUSB302MPX as short, length-matched traces (ideally under 15 mm) on a layer adjacent to ground. The PD BMC waveform shares these pins with DC attach-level sensing, so coupling from adjacent switching regulator nodes or high-speed USB 3.1 superspeed pairs can corrupt PD arbitration. Keep a ground guard or at least 3x trace-width spacing from switching nodes, and add the standard ESD protection at the connector per USB Type-C port requirements.
The most common integration pitfall is software, not hardware: the original FUSB302 was developed while the USB-C specification was still changing, and per onsemi the FUSB302B variant incorporates updates that make USB-IF compliance easier and is the recommended part for new designs. When replacing an FUSB302MPX with the FUSB302BMPX, onsemi confirms no software optimization is required, but new firmware development should target the B-step register behavior and validate against current USB-C compliance test suites.
Compliance Information
RoHS compliant and lead-free per onsemi/DigiKey product listings. REACH, halogen-free, and conflict-minerals status not stated in verified data - confirm via onsemi environmental documentation.
