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Arduino UNO R4 WiFi pinout

Name: Arduino UNO R4 WiFi pinout with per-pin electrical limits
Creator: Xirkit

All 51 pins of the Arduino UNO R4 WiFi, each mapped to the R7FA4M1AB3CFP pad it routes to, with its functions and — for 33 pins — the electrical limits from the chip datasheet. Every number cites its page and table.

51 pins documented33 with electrical limits4 control5 power out7 ground2 power in32 gpio1 analogcomplete pinout

Pin table

Arduino UNO R4 WiFi pins, functions and electrical limits

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VIH/VIL: input thresholds · VOH/VOL: output levels · IOH/IOL: output current. Values apply to the chip pad each pin routes to, under the conditions cited in the source.
Pin	Position	Kind	Chip pad	Functions	VIH	VIL	VOH	VOL	IOH	IOL	5 V tolerant	Abs max	Source
BOOT	JANALOG · 1	control	P201	BOOT (mode select), P201, MD	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
IOREF	JANALOG · 2	power out		power_out									p.19 table 19_1
Reset	JANALOG · 3	control	RES	RESET
+3V3	JANALOG · 4	power out		power_out									p.16
+5V	JANALOG · 5	power out		power_out									p.16
GND	JANALOG · 6	ground		ground
GND	JANALOG · 7	ground		ground
VIN	JANALOG · 8	power in		power_in									p.8 table 8_1
A0	JANALOG · 9	gpio	P014	A0, D14, DAC (DA0, 12-bit), P014, AN009, DA0	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
A1	JANALOG · 10	gpio	P000	A1, D15, OPAMP+, P000, IRQ6, AN000, AMP0+, TS21	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
A2	JANALOG · 11	gpio	P001	A2, D16, OPAMP-, P001, IRQ7, AN001, AMP0-, TS22	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
A3	JANALOG · 12	gpio	P002	A3, D17, OPAMP OUT, P002, IRQ2, AN002, AMP0O	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
A4	JANALOG · 13	gpio	P101	A4, D18, I2C SDA (Wire), P101, KR01/IRQ1, AGTEE0, GTETRGB, GTIOC5A, TXD0/MOSI0/SDA0, CTS1_RTS1/SS1, SDA1, MOSIA, AN021, CMPREF0, VL2	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
A5	JANALOG · 14	gpio	P100	A5, D19, I2C SCL (Wire), P100, KR00/IRQ2, AGTIO0, GTETRGA, GTIOC5B, RXD0/MISO0/SCL0, SCK1, SCL1, MISOA, AN022, CMPIN0, VL1	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
SCL	JDIGITAL · 1	gpio	P100	SCL, I2C SCL (Wire), P100, KR00/IRQ2, AGTIO0, GTETRGA, GTIOC5B, RXD0/MISO0/SCL0, SCK1, SCL1, MISOA, AN022, CMPIN0, VL1	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
SDA	JDIGITAL · 2	gpio	P101	SDA, I2C SDA (Wire), P101, KR01/IRQ1, AGTEE0, GTETRGB, GTIOC5A, TXD0/MOSI0/SDA0, CTS1_RTS1/SS1, SDA1, MOSIA, AN021, CMPREF0, VL2	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
AREF	JDIGITAL · 3	analog		AREF (analog reference input)
GND	JDIGITAL · 4	ground		ground
D13	JDIGITAL · 5	gpio	P102	D13, SCK, CANRX0, LED_BUILTIN (shared net P102), P102, KR02, AGTO0, GTOWLO, GTIOC2B, CRX0, SCK0, TXD2/MOSI2/SDA2, RSPCKA, AN020/ADTRG0, CMPIN1, VL3	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D12	JDIGITAL · 6	gpio	P410	D12, CIPO, P410, IRQ5, AGTOB1, GTOVLO, GTIOC6B, RXD0/MISO0/SCL0, MISOA, SEG08, TS06	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D11	JDIGITAL · 7	gpio	P411	D11, COPI, PWM, P411, IRQ4, AGTOA1, GTOVUP, GTIOC6A, TXD0/MOSI0/SDA0, MOSIA, SEG07, TS07	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D10	JDIGITAL · 8	gpio	P103	D10, CS, CANTX0, PWM, P103, KR03, GTOWUP, GTIOC2A, CTX0, CTS0_RTS0/SS0, SSLA0, AN019, CMPREF1, VL4	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D9	JDIGITAL · 9	gpio	P303	D9, PWM, P303, GTIOC7B, SEG03/COM7, TS02	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D8	JDIGITAL · 10	gpio	P304	D8, P304, IRQ9, GTIOC7A, SEG20, TS11	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D7	JDIGITAL · 11	gpio	P112	D7, P112, GTIOC3B, TXD2/MOSI2/SDA2, SCK1, SSLB0, SSIBCK0, CAPL, TSCAP	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D6	JDIGITAL · 12	gpio	P111	D6, PWM, P111, IRQ4, GTIOC3A, SCK2, SCK9, RSPCKB, CAPH, TS12	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D5	JDIGITAL · 13	gpio	P107	D5, PWM, P107, KR07, GTIOC0A, COM3	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D4	JDIGITAL · 14	gpio	P106	D4, P106, KR06, GTIOC0B, SSLA3, COM2	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D3	JDIGITAL · 15	gpio	P105	D3, PWM, external interrupt, P105, KR05/IRQ0, GTETRGA, GTIOC1A, SSLA2, COM1, TS34	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D2	JDIGITAL · 16	gpio	P104	D2, external interrupt, P104, KR04/IRQ1, GTETRGB, GTIOC1B, RXD0/MISO0/SCL0, SSLA1, COM0, TS13	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D1	JDIGITAL · 17	gpio	P302	D1, TX0, Serial1 TX (SCI_TXD2), P302, IRQ5, GTOUUP, GTIOC4A, TXD2/MOSI2/SDA2, SSLB3, SEG02/COM6, TS08	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
D0	JDIGITAL · 18	gpio	P301	D0, TX0, Serial1 RX (SCI_RXD2), P301, IRQ6, AGTIO0, GTOULO, GTIOC4B, RXD2/MISO2/SCL2, CTS9_RTS9/SS9, SSLB2, SEG01/COM5, TS09	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
OFF	JOFF · 1	control		buck converter enable (pull low to switch the board off)
GND	JOFF · 2	ground		ground
VRTC	JOFF · 1	power in	VBATT	power_in									R7FA4M1AB3CFM datasheet p.29 table 29_1
CIPO	ICSP · 1	gpio	P410	SPI CIPO, P410, IRQ5, AGTOB1, GTOVLO, GTIOC6B, RXD0/MISO0/SCL0, MISOA, SEG08, TS06	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
+5V	ICSP · 2	power out		power_out									p.16
SCK	ICSP · 3	gpio	P102	SPI SCK, P102, KR02, AGTO0, GTOWLO, GTIOC2B, CRX0, SCK0, TXD2/MOSI2/SDA2, RSPCKA, AN020/ADTRG0, CMPIN1, VL3	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
COPI	ICSP · 4	gpio	P411	SPI COPI, P411, IRQ4, AGTOA1, GTOVUP, GTIOC6A, TXD0/MOSI0/SDA0, MOSIA, SEG07, TS07	≥ 4 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	no	-0.3–5.3 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
RESET	ICSP · 5	control	RES	RESET
GND	ICSP · 6	ground		ground
ESP_IO42	J6_ESP · 1	gpio	GPIO42	GPIO42, MTMS, GPIO matrix (any routable peripheral signal: UART, I2C, I2S, LEDC PWM, MCPWM, RMT, PCNT, TWAI, SPI, LCD/camera)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	40 mA typ	28 mA typ	no	-0.3–3.6 V	ESP32-S3 datasheet p.65 table 65_2
ESP_IO41	J6_ESP · 2	gpio	GPIO41	GPIO41, MTDI, CLK_OUT1, GPIO matrix (any routable peripheral signal: UART, I2C, I2S, LEDC PWM, MCPWM, RMT, PCNT, TWAI, SPI, LCD/camera)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	40 mA typ	28 mA typ	no	-0.3–3.6 V	ESP32-S3 datasheet p.65 table 65_2
ESP_TXD0	J6_ESP · 3	gpio	GPIO43	GPIO43, TXD0, U0TXD, CLK_OUT1, GPIO matrix (any routable peripheral signal: UART, I2C, I2S, LEDC PWM, MCPWM, RMT, PCNT, TWAI, SPI, LCD/camera)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	40 mA typ	28 mA typ	no	-0.3–3.6 V	ESP32-S3 datasheet p.65 table 65_2
ESP_DOWNLOAD	J6_ESP · 4	gpio	GPIO0	GPIO0, DOWNLOAD, GPIO matrix (any routable peripheral signal: UART, I2C, I2S, LEDC PWM, MCPWM, RMT, PCNT, TWAI, SPI, LCD/camera), RTC_GPIO0, sar_i2c_scl_0	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	40 mA typ	28 mA typ	no	-0.3–3.6 V	ESP32-S3 datasheet p.65 table 65_2
ESP_RXD0	J6_ESP · 5	gpio	GPIO44	GPIO44, RXD0, U0RXD, CLK_OUT2, GPIO matrix (any routable peripheral signal: UART, I2C, I2S, LEDC PWM, MCPWM, RMT, PCNT, TWAI, SPI, LCD/camera)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	40 mA typ	28 mA typ	no	-0.3–3.6 V	ESP32-S3 datasheet p.65 table 65_2
GND	J6_ESP · 6	ground		ground
GND	J2_QWIIC · 1	ground		ground
+3.3V	J2_QWIIC · 2	power out		power_out									p.16
SDA (Wire1)	J2_QWIIC · 3	gpio	P401	IIC0_SDA, P401, IRQ5, GTETRGA, GTIOC6B, CTX0, CTS0_RTS0/SS0, TXD1/MOSI1/SDA1, SDA0, SEG05, TS19	4–5.8 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	yes	-0.3–6.5 V	R7FA4M1AB3CFM datasheet p.32 table 32_1
SCL (Wire1)	J2_QWIIC · 4	gpio	P400	IIC0_SCL, P400, CACREF, IRQ0, AGTIO1, GTIOC6A, SCK0, SCK1, SCL0, AUDIO_CLK, SEG04, TS20	4–5.8 V	≤ 1 V	≥ 4.2 V	≤ 0.8 V	≤ -4 mA	≤ 4 mA	yes	-0.3–6.5 V	R7FA4M1AB3CFM datasheet p.32 table 32_1

Answers from the record

Arduino UNO R4 WiFi pinout FAQ

What microcontroller does the Arduino UNO R4 WiFi use?

The Arduino UNO R4 WiFi is built around the R7FA4M1AB3CFP, alongside ESP32-S3, NLASB3157DFT2G, ISL854102FRZ-T, TXB0108DQSR.

How many GPIO pins does the Arduino UNO R4 WiFi have?

20 GPIO pins are exposed. Xirkit documents 51 board pins, 33 of them with pin-level electrical limits.

Are the Arduino UNO R4 WiFi I/O pins 5 V tolerant?

2 pins are 5 V tolerant and 30 are not — check each pin in the pinout table before connecting 5 V signals.

How much current can a Arduino UNO R4 WiFi GPIO pin source?

Documented output-high current per pin: ≤ -4 mA. Values are traced to the chip datasheet; see the pinout table for per-pin limits and conditions.

What voltage powers the Arduino UNO R4 WiFi?

Supply range 1.6–24 V. Power inputs: VIN (6–24 V), VRTC (1.6–3.6 V).

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