Two-port USB hub controller with USB 3.2 and industrial temperature
The Microchip USB5742BT-I/2G is a two-port USB hub controller supporting both USB 2.0 and USB 3.2 protocols, making it suitable for high-speed peripheral expansion in embedded systems that need backward compatibility with legacy USB 2.0 devices. The dual supply rails — 1.08V to 1.32V for the core and 3V to 3.6V for the I/O — require a regulated power tree; the 1.2V rail should be derived from a low-noise LDO to keep the SerDes jitter within the USB 3.2 eye mask.
Package and board integration — 56-VFQFN exposed pad
The 56-VFQFN package (7x7 mm body, 0.5 mm pitch) with exposed thermal pad requires a solder-paste stencil opening that covers at least 50% of the pad area, and the PCB land pattern should connect the pad to a copper plane on an inner layer for thermal management — the junction-to-board thermal resistance is dominated by this pad. The SMBus and SPI interfaces share the same pins in a multiplexed configuration — the strapping resistor on the CFG_SEL pin at power-up selects which protocol the host uses for register access; leaving it floating defaults to SMBus.
Active lifecycle and compliance documentation
ROHS3 compliant (exemption-free), covering the full EU RoHS substance ban including the four phthalates added in Directive 2015/863. Microchip provides the datasheet, application notes for USB 3.2 PHY layout, and an IBIS model for signal-integrity simulation — these are available from the manufacturer's documentation portal under the USB5742 product family.