M66291 R8A66591 USB 2.0 Device Controller IC

The M66291 (R8A66591) Charging / USB 2.0 Device Controller IC is designed to provide USB peripheral functionality in embedded products. With a built-in USB transceiver, this IC handles both the electrical and protocol-level requirements for USB 2.0 Full-Speed devices.

It is widely used in automotive electronics, industrial modules, programmable controllers, instrumentation, and custom embedded designs where reliable USB connectivity is essential. Renesas engineers designed this IC to reduce external components, simplify board layout, and improve power efficiency.

Typical functions include:

• USB device endpoint management
• USB data transfer and buffering
• Signaling and protocol handling
• Smooth integration with microcontrollers and SoCs

Technicians and developers often replace or integrate this IC in systems experiencing USB recognition failures, intermittent device communication, or controller-level faults.

At OKSpare Nehru Place, the M66291 / R8A66591 IC is kept in ready stock and available in both wholesale and retail quantities. Every part is quality tested and suitable for automotive, industrial, and embedded USB applications.

• Manufacturer: Renesas Electronics
• Type: USB 2.0 Full-Speed Device Controller IC
• Function: Enables USB peripheral communication with built-in transceiver
• Package: 48-pin LQFP (Low-Profile Quad Flat Package)
• Communication Role: Handles USB protocol, data exchange, signaling, and endpoint control
• Applications:
• Automotive modules
• Industrial control systems
• Embedded devices requiring USB interface
• Peripheral design / custom system connectivity
• Features:
• Integrated USB PHY/transceiver
• Full-speed 12 Mbps USB communication
• Low-power operation suitable for embedded systems