Arduino S.r.l. · structured pinout

Arduino Nano pinout

Name: Arduino Nano pinout with per-pin electrical limits
Creator: Xirkit

All 30 pins of the Arduino Nano, each mapped to the ATmega328P pad it routes to, with its functions and — for 24 pins — the electrical limits from the chip datasheet. Every number cites its page and table.

30 pins documented24 with electrical limits20 gpio2 control2 ground2 power out3 analog1 power incomplete pinout

Pin table

Arduino Nano pins, functions and electrical limits

Markdown · JSON

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
D1/TX	J2 · 1	gpio	PD1	TX (Serial), PD1, TXD, PCINT17	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D0/RX	J2 · 2	gpio	PD0	RX (Serial), PD0, RXD, PCINT16	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
RESET	J2 · 3	control	PC6	PC6, RESET, PCINT14	4.5–5.5 V	-0.5–0.5 V					yes	-0.5–13 V	ATmega328P datasheet p.322 table 322_1
GND	J2 · 4	ground		ground
D2	J2 · 5	gpio	PD2	PD2, INT0, PCINT18	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D3	J2 · 6	gpio	PD3	PWM (~D3), PD3, PCINT19, OC2B, INT1	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D4	J2 · 7	gpio	PD4	PD4, PCINT20, XCK, T0	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D5	J2 · 8	gpio	PD5	PWM (~D5), PD5, PCINT21, OC0B, T1	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D6	J2 · 9	gpio	PD6	PWM (~D6), PD6, PCINT22, OC0A, AIN0	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D7	J2 · 10	gpio	PD7	PD7, PCINT23, AIN1	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D8	J2 · 11	gpio	PB0	PB0, PCINT0, CLKO, ICP1	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D9	J2 · 12	gpio	PB1	PWM (~D9), PB1, PCINT1, OC1A	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D10	J2 · 13	gpio	PB2	PWM (~D10), PB2, PCINT2, SS, OC1B	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D11	J2 · 14	gpio	PB3	PWM (~D11), COPI, PB3, PCINT3, OC2A, MOSI	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D12	J2 · 15	gpio	PB4	CIPO, PB4, PCINT4, MISO	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
D13	J1 · 16	gpio	PB5	LED_BUILTIN, PB5, SCK, PCINT5	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
+3V3	J1 · 17	power out		power_out									p.8
AREF	J1 · 18	analog	AREF	aref									ATmega328P datasheet p.319 table 319_1
A0	J1 · 19	gpio	PC0	D14, PC0, ADC0, PCINT8	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
A1	J1 · 20	gpio	PC1	D15, PC1, ADC1, PCINT9	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
A2	J1 · 21	gpio	PC2	D16, PC2, ADC2, PCINT10	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
A3	J1 · 22	gpio	PC3	D17, PC3, ADC3, PCINT11	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
A4	J1 · 23	gpio	PC4	D18, PC4, ADC4, SDA, PCINT12	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
A5	J1 · 24	gpio	PC5	D19, PC5, ADC5, SCL, PCINT13	3–5.5 V	-0.5–1.5 V	4.2–5 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega328P datasheet p.323 table 323_1
A6	J1 · 25	analog	ADC6	ADC6	analog input only — no digital input buffer	analog input only — no digital input buffer	input-only pin (no output driver)	input-only pin (no output driver)	input-only pin (no output driver)	input-only pin (no output driver)	yes	-0.5–5.5 V	ATmega328P datasheet p.319 table 319_1
A7	J1 · 26	analog	ADC7	ADC7	analog input only — no digital input buffer	analog input only — no digital input buffer	input-only pin (no output driver)	input-only pin (no output driver)	input-only pin (no output driver)	input-only pin (no output driver)	yes	-0.5–5.5 V	ATmega328P datasheet p.319 table 319_1
+5V	J1 · 27	power out		power_out									p.2
RESET	J1 · 28	control	PC6	PC6, RESET, PCINT14	4.5–5.5 V	-0.5–0.5 V					yes	-0.5–13 V	ATmega328P datasheet p.322 table 322_1
GND	J1 · 29	ground		ground
VIN	J1 · 30	power in		power_in									p.8

Answers from the record

Arduino Nano pinout FAQ

What microcontroller does the Arduino Nano use?

The Arduino Nano is built around the ATmega328P, alongside FT232RL, LM1117IMPX-5.0.

How many GPIO pins does the Arduino Nano have?

20 GPIO pins are exposed. Xirkit documents 30 board pins, 24 of them with pin-level electrical limits.

Are the Arduino Nano I/O pins 5 V tolerant?

Yes, the documented I/O pins are 5 V tolerant. Input-high threshold: 3–5.5 V.

How much current can a Arduino Nano GPIO pin source?

Documented output-high current per pin: ≤ 40 mA. Values are traced to the chip datasheet; see the pinout table for per-pin limits and conditions.

What voltage powers the Arduino Nano?

Supply range 5–12 V. Power inputs: VIN (7–12 V).

Go deeper

Looking for something else? Browse every structured part.