Arduino® Nano R4
— Compact, production-ready Arduino with Renesas RA4M1 —

OVERVIEW
Nano R4 merges Arduino’s signature ease of use with the powerful Renesas RA4M1 microcontroller, enabling effortless scaling from prototyping on the UNO R4 to production-ready applications.
Compact and versatile, it maintains the Nano family pinout and adds castellated pins for easy hardware integration, an on-board Qwiic connector for rapid sensor/peripheral expansion, and a programmable RGB LED for intuitive feedback.
Its single-sided component design is ideal for space-constrained products and SMD soldering on custom carrier boards—seamlessly bridging lab testing and real-world deployment.
Thanks to compatibility with familiar Arduino tools and libraries (including those for UNO R4 Minima), the Nano R4 streamlines building compact, connected, production-ready solutions.

KEY BENEFITS
• Effortless transition from prototype to production using the trusted RA4M1 with minimal code changes.
• Compact, production-ready design: tiny 4.3 × 1.7 cm footprint, castellated pins, single-sided components.
• Easy expansion: built-in Qwiic plus an additional 5V I2C port for sensors/actuators, including Modulino nodes.
• Customizable feedback via a programmable RGB LED for faster debugging and smarter UX.
• Flexible, familiar platform: leverage Arduino IDE, libraries, and a robust community.

APPLICATION EXAMPLES
• Embedded industrial systems where space is limited and reliability is critical.
• Home automation with rapid sensor/actuator integration.
• Prototypes that scale to compact production designs with minimal rework.
• Compact robotics and automation with robust connectivity.
• Custom hardware platforms using the castellated design on bespoke PCBs.

GETTING STARTED
Learning to prototype? Check out the Arduino® Nano R4 with headers for an easier introduction to Nano and Modulino nodes.

TECHNICAL SPECIFICATIONS
Board
• Name: Arduino® Nano R4
• SKU: ABX00142

Microcontroller
• Renesas RA4M1 (Arm® Cortex®-M4)

USB
• USB-C® programming port

Pins
• Digital I/O: 21 (all exposed I/O usable as digital)
• Analog inputs: 8
• DAC: 1
• PWM: 6
• External interrupts: 2, 3

Misc
• DAC: A0
• OpAmp: A1, A2, A3
• VRTC: J5

Communication
• UART: 1
• I2C: 2 (5V: A4, A5 / 3.3V: Qwiic, J3, J4)
• SPI: 1
• CAN: 1

Power
• Circuit operating voltage: +5 VDC
• Input voltage (VIN): +6–21 VDC
• DC current per I/O pin: 8 mA

Clock
• Main core: 48 MHz

Memory (RA4M1)
• Flash: 256 kB
• RAM: 32 kB
• EEPROM: 8 kB

Dimensions
• Width: 18 mm
• Length: 45 mm

FEATURE HIGHLIGHTS
• Nano family pinout, castellated edges, single-sided components
• Qwiic connector + extra 5V I2C port
• Programmable RGB LED