FUSB303BTMX

The FUSB303BTMX is a USB Type-C Port Controller from ON Semiconductor. It provides complete CC logic for USB‑C connectors (attach/detach detection, cable orientation, and role detection) and controls VBUS via external FETs to implement a Type-C port’s source/sink behavior. The device is configured and monitored by a host MCU over I2C, with optional interrupt/alert signaling for status events. It can advertise current capability (Rp/Rd), handle safe power-on and fault protection, and support basic USB-C port protection in devices such as adapters, hubs, power banks, and docks. The BT MX suffix indicates a specific package variant and temperature range in which the part is offered. For exact pinout, electrical specs, PD capabilities, and application notes, refer to the official FUSB303BTMX datasheet from ON Semiconductor.

Equivalent parts (USB-C Type-C/PD controllers with CC logic): STMicroelectronics STUSB4500, STUSB1602, STUSB4700; Texas Instruments TPS65988 (and family) or TUSB3x; NXP PTN5110/PTN5111; Infineon/Cypress CYPD3xxx series; On Semiconductor FUSB302 (older PD controller). These are functionally similar but not exact drop-ins—verify PD features, package, and pinout for your design.

Here are the key features of FUSB303BTMX (USB Type-C Port Controller with PD):
- USB Type-C port controller with integrated PD engine
- Dual-role port support (source/sink) with role arbitration
- CC1/CC2 detection and orientation sensing
- I2C interface for configuration, status, and PD events
- VBUS switch/path with built-in current limit and protections
- VCONN support for active cables
- USB PD messaging and negotiation (PD compliant; supports elevation of voltage/current as negotiated)
- Dead-battery support for powered PD negotiation
- Fault protection: overcurrent, overvoltage, short-circuit, and thermal protection
- Interrupt/status outputs for event signaling
- Small 8-pin BTMX package; suitable for space-constrained designs
Note: Specific current limits, voltage ranges, and PD profile support may vary by revision; please consult the datasheet for exact specs.

- Pin count: 16 pins (FUSB303BTMX in a 16-pin QFN package).
- Function: USB Type-C Port Controller with I2C interface for PD/CC negotiation. It monitors CC1/CC2, controls VBUS via an external FET, provides VBUS sensing, and generates host interrupts/alerts. I2C lines (SDA/SCL), RESET, address/config pins, and power/GND pins are included for MCU communication and control.

Manufacturer: ON Semiconductor (onsemi).
What kind of company: A global American semiconductor company that designs and manufactures integrated circuits and semiconductor devices for automotive, industrial, and consumer electronics.

FUSB303BTMX is a USB Type-C PD controller IC. Typical application areas:
- USB-C power adapters/chargers (PD sources)
- USB-C hubs and docking stations
- Laptops, tablets, and 2-in-1 devices with PD charging
- Power banks/portable chargers with PD
- Monitors and displays supporting USB-C PD
- Automotive and consumer electronics with USB-C charging
- Active USB-C cables/accessories requiring CC logic and PD negotiation

QFN package, 20-pin (4x4 mm) with exposed pad (RoHS).