arduino Nano R4

Part & documents

Data sheet	Data sheet →
Source	store.arduino.cc/products/nano-r4 →

Specs

MCU	Renesas R7FA4M1AB3CFM#HA0 (Arm Cortex-M4 at 48 MHz with FPU, 256 kB flash, 32 kB SRAM, 8 kB data flash, 14-bit ADC, 12-bit DAC, OPAMP, RTC, CAN)
Clock	48 MHz
RAM	32 KB

Pinout

30 pads, as the vendor numbers them.

#	Name	Function	Signals
1	D13 / SCK	Analog-side header JP1 pad 1: D13 / SCK, the SPI serial clock	digital 13, SPI SCK
2	+3V3	Analog-side header JP1 pad 2: +3V3, output of the AP2112K-3.3TRG1 regulator - it feeds the Qwiic connector, and Arduino warns the board may get very hot if more than 150 mA is drawn from it	3.3 V rail
3	AREF	Analog-side header JP1 pad 3: AREF, the ADC's external reference input (VAREF). On this board VDD is the 5 V rail, so a 5 V logic level and a 5 V ADC full scale are the defaults	analogue reference
4	A0	Analog-side header JP1 pad 4: A0, analogue input 0 and the 12-bit DAC output	analogue input 0, DAC output
5	A1	Analog-side header JP1 pad 5: A1, analogue input 1 and the operational amplifier's non-inverting input	analogue input 1, OPAMP +
6	A2	Analog-side header JP1 pad 6: A2, analogue input 2 and the operational amplifier's inverting input	analogue input 2, OPAMP -
7	A3	Analog-side header JP1 pad 7: A3, analogue input 3 and the operational amplifier's output	analogue input 3, OPAMP out
8	A4	Analog-side header JP1 pad 8: A4, analogue input 4 and SDA of the main I2C bus (Wire) - Arduino says not to use it as an ADC input while the bus is in use	analogue input 4, I2C SDA
9	A5	Analog-side header JP1 pad 9: A5, analogue input 5 and SCL of the main I2C bus (Wire) - same warning as A4	analogue input 5, I2C SCL
10	A6	Analog-side header JP1 pad 10: A6, analogue input 6 with no digital function	analogue input 6
11	A7	Analog-side header JP1 pad 11: A7, analogue input 7 with no digital function	analogue input 7
12	5V	Analog-side header JP1 pad 12: 5V, the board's 5 V rail (USB power, or the buck converter's output when running from VIN)	5 V rail, USB power
13	BOOT	Analog-side header JP1 pad 13: BOOT, mode selection - pulling it at reset puts the RA4M1 into its bootloader for board recovery	boot mode select
14	GND	Analog-side header JP1 pad 14: GND	ground
15	VIN	Analog-side header JP1 pad 15: VIN, the DC input, 6 V to 21 V, stepped down to 5 V by the MP2322GQH buck converter	power input
16	D12 / CIPO	Digital-side header JP2 pad 15: D12 / CIPO (controller in, peripheral out - the old MISO)	digital 12, SPI CIPO
17	D11 / COPI	Digital-side header JP2 pad 14: D11 / COPI (controller out, peripheral in - the old MOSI), PWM capable	digital 11, SPI COPI, PWM
18	D10 / CS	Digital-side header JP2 pad 13: D10 / CS, the SPI chip select, PWM capable	digital 10, SPI CS, PWM
19	D9	Digital-side header JP2 pad 12: D9, PWM capable	digital 9, PWM
20	D8	Digital-side header JP2 pad 11: D8	digital 8
21	D7	Digital-side header JP2 pad 10: D7	digital 7
22	D6	Digital-side header JP2 pad 9: D6, PWM capable	digital 6, PWM
23	D5	Digital-side header JP2 pad 8: D5, PWM capable and the CAN receive line - an external CAN transceiver is required	digital 5, PWM, CAN RX
24	D4	Digital-side header JP2 pad 7: D4, the CAN transmit line - an external CAN transceiver is required	digital 4, CAN TX
25	D3	Digital-side header JP2 pad 6: D3, PWM capable	digital 3, PWM
26	D2	Digital-side header JP2 pad 5: D2	digital 2
27	GND	Digital-side header JP2 pad 4: GND	ground
28	RST	Digital-side header JP2 pad 3: RST, the reset line, with a reset button on the board	reset, reset button
29	D0/RX	Digital-side header JP2 pad 2: D0/RX, the hardware UART's receive line - the same port the USB-C serial interface presents	digital 0, UART RX
30	D1/TX	Digital-side header JP2 pad 1: D1/TX, the hardware UART's transmit line, shared with the USB-C serial interface	digital 1, UART TX

Buses

Bus	Signals	Pins	Voltage	Note
I2C ×2	SDA, SCL	A4, A5	5 V on A4/A5, 3.3 V on the Qwiic connector V	Two buses, no on-board device, so no addresses. The main bus is Wire on A4 (SDA) and A5 (SCL) at 5 V; the Qwiic JST-SH connector carries I2C0 as Wire1 at 3.3 V, with the level translation fitted on the board. Arduino says A4 and A5 must not be used as ADC inputs while the main bus is in use, and that both connection points can be populated at once.
SPI ×1	SCK, CIPO, COPI, CS	D13/SCK, D12 / CIPO, D11 / COPI, D10 / CS	5 V V	One SPI bus on D13 (SCK), D12 (CIPO - the old MISO name), D11 (COPI - the old MOSI name) and D10 (CS), all 5 V logic.
UART ×1	TX, RX	D1/TX, D0/RX	5 V V	One hardware UART on D0 (RX) and D1 (TX). The USB-C port is wired to the same serial interface, so a device on those pads shares the port the IDE uses.
CAN ×1	CAN_TX, CAN_RX	D4, D5	5 V V	The RA4M1's CAN controller reaches D4 (TX) and D5 (RX), but the board carries no transceiver - an external one is required before either pad can sit on a CAN bus.

Power

Input	6.0-21.0 V DC on VIN (buck-converted to 5 V by the MP2322GQH), or 4.8-5.5 V on the USB-C connector
Input range	VIN 6.0 V min, 7.0 V typ, 21.0 V max; VUSB 4.8 V min, 5.0 V typ, 5.5 V max; USB input current 500 mA max

The RTC and its 32.768 kHz domain can be backed up from VBATT (JP2-adjacent pad, 1.6-3.6 V); the switch-over from the main supply to the backup cell happens as VCC falls through 2.09 V typical.

Outputs

Rail	Rating	Note
5V	5 V V	The board's logic rail, from USB or from the buck converter, brought out on JP1 pad 12. A power-OR circuit selects between the two sources automatically.
3.3V	3.3 V V	AP2112K-3.3TRG1 LDO feeding the Qwiic connector, on JP1 pad 2. Arduino warns the board may become very hot if more than 150 mA is drawn from this pin.

Notes

Arduino numbers the two headers independently: JP1 (analog side) pads 1-15 and JP2 (digital side) pads 1-15, with JP2's own numbers running 15 down to 1. Two pads numbered 1-15 in one pin list would collide, so pins[] numbers JP1 1-15 and JP2 16-30, and every description names the connector and the vendor's own pad number - the same offset convention the VS1053 entry uses for its two 1x16 headers. Labels are the 'Function' column of the datasheet's own pinout tables (4.1.1 Analog / 4.1.2 Digital), joined to the pad numbers in those same tables, so number and label come from one machine-readable source rather than from a picture. The board's own datasheet is the vendor document linked in datasheet_url; the silicon's document is Renesas' RA4M1 series documentation, which Arduino links rather than mirrors, and no figure here is quoted from it. 14 digital I/O, 8 analog channels, 43.18 x 17.78 mm, castellated edges for carrier soldering, and Arduino's Nano Connector Carrier (ASX00061) is the matching carrier.

AI context

Dense context for pasting into a model prompt — addresses, pinout, voltages, tolerances and the vendor's reference circuit.

PART: Arduino Nano R4, SKU ABX00142, 43.18 x 17.78 mm Nano-form-factor board on a Renesas R7FA4M1AB3CFM#HA0 - Arm Cortex-M4 at 48 MHz with floating point unit, 256 kB flash, 32 kB SRAM, 8 kB data flash (EEPROM), 14-bit ADC, 12-bit DAC, one operational amplifier, RTC with an external crystal, USB 2.0 full-speed and CAN (transceiver external). The board is 5 V logic throughout, keeps the classic Nano 2 x 15 pinout with castellated pads, adds a 4-pin Qwiic connector on a second I2C bus, a programmable RGB LED, a single-colour LED_BUILTIN, a reset button and an MP2322GQH buck converter on VIN.
PINOUT: Arduino numbers the two headers independently - JP1 (analog side) pads 1-15 and JP2 (digital side) pads 1-15, with JP2's numbers running the opposite way - so this entry numbers JP1 1-15 and JP2 16-30 and each description names its connector and the vendor's own pad number. JP1 (1-15): D13/SCK, +3V3, AREF, A0, A1, A2, A3, A4, A5, A6, A7, 5V, BOOT, GND, VIN. JP2 in this entry's order, pads 15 down to 1 (16-30): D12/CIPO, D11/COPI, D10/CS, D9, D8, D7, D6, D5, D4, D3, D2, GND, RST, D0/RX, D1/TX.
I2C: two buses and no device on either, so there are no addresses. The main bus (the Wire object) is on A4 SDA and A5 SCL at 5 V; the Qwiic connector carries the secondary bus (Wire1) on a JST-SH SM04B-SRSS-TB, powered at 3.3 V from the AP2112K-3.3TRG1 regulator and level-translated up to the RA4M1's 5 V domain. Arduino states A4 and A5 should not be used as ADC inputs while the bus is in use, and that devices may be attached to the pins and the Qwiic connector at the same time.
SUPPLY: VIN accepts 6.0 V minimum, 7.0 V typical, 21.0 V maximum DC and is buck-converted to 5 V; the USB-C input accepts 4.8 V to 5.5 V (5.0 V typical) and Arduino says never to exceed 5 V there. A power-OR circuit picks between USB and the buck output automatically. The 3V3 pin is an output only - above 150 mA drawn from it Arduino warns the board may get very hot, because it is an LDO.
LOGIC AND LIMITS: every header pin is 5 V logic and VDD is tied to the 5 V rail, so AREF defaults to 5 V full scale; the Qwiic connector is the only 3.3 V interface. Each GPIO handles 8 mA maximum - Arduino says never to drive more than that directly and to use a transistor or MOSFET for anything heavier. VBATT for the RTC backup accepts 1.6 V to 3.6 V and the switch-over to backup happens as VCC falls through 2.09 V typical (1.99 to 2.19 V).
TRAPS: (1) the Qwiic bus is 3.3 V while the rest of the board is 5 V - a Qwiic sensor sees 3.3 V logic, and the translation is on the board, in one direction of use only. (2) Wire1 is Qwiic and Wire is A4/A5; code written for one will not find a device on the other. (3) A4/A5 are the only ADC channels wired to the main I2C bus, so a bus in use removes analogue inputs 4 and 5. (4) VIN has a 6 V minimum - a 5 V supply must go to the 5V pin or USB-C, not VIN. (5) D4 and D5 are the CAN pair and need an external transceiver; nothing on the board converts them. (6) D0/RX and D1/TX are the same UART the USB-C serial interface drives. (7) USB-C must not be fed more than 5 V, and the port is rated 500 mA.
BOARD FACTS: 14 digital I/O, 8 analogue channels, operating temperature -40 to +85 C, 43.18 x 17.78 mm Nano footprint with dual castellated/through-hole pads on a 2.54 mm pitch, 1.0 mm holes, four 1.65 mm mounting holes and a single-sided component placement so it can be reflowed onto a carrier. The board is code-compatible with the UNO R4 Minima for the RA4M1 peripherals, and Arduino's own Nano Connector Carrier (ASX00061) is the matching carrier.

Provenance

Every figure on this page was read from the 3 sources below and last checked on Oct 24, 2026.