Arduino S.r.l. · structured pinout

Arduino Mega 2560 Rev3 pinout

Name: Arduino Mega 2560 Rev3 pinout with per-pin electrical limits
Creator: Xirkit

All 96 pins of the Arduino Mega 2560 Rev3, each mapped to the ATmega2560-16AU pad it routes to, with its functions and — for 78 pins — the electrical limits from the chip datasheet. Every number cites its page and table.

96 pins documented78 with electrical limits1 nc6 power out2 control6 ground2 power in72 gpio7 debugcomplete pinout

Pin table

Arduino Mega 2560 Rev3 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
NC	JANALOG · 1	nc		no_connect
IOREF	JANALOG · 2	power out		power_out									p.11 table 11_1
Reset	JANALOG · 3	control	RESET	RESET	4.5–5.5 V	-0.5–0.5 V						-0.5–13 V	ATmega2560-16AU datasheet p.355 table 355_1
+3V3	JANALOG · 4	power out		power_out									p.38
+5V	JANALOG · 5	power out		power_out									p.11 table 11_1
GND	JANALOG · 6	ground		ground
GND	JANALOG · 7	ground		ground
VIN	JANALOG · 8	power in		power_in									p.6 table 6_1
A0	JANALOG · 9	gpio	PF0	A0 (ADC0), A0, PF0, ADC0	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A1	JANALOG · 10	gpio	PF1	A1 (ADC1), A1, PF1, ADC1	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A2	JANALOG · 11	gpio	PF2	A2 (ADC2), A2, PF2, ADC2	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A3	JANALOG · 12	gpio	PF3	A3 (ADC3), A3, PF3, ADC3	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A4	JANALOG · 13	gpio	PF4	A4 (ADC4), A4, PF4, ADC4, TCK	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A5	JANALOG · 14	gpio	PF5	A5 (ADC5), A5, PF5, ADC5, TMS	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A6	JANALOG · 15	gpio	PF6	A6 (ADC6), A6, PF6, ADC6, TDO	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A7	JANALOG · 16	gpio	PF7	A7 (ADC7), A7, PF7, ADC7, TDI	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A8	JANALOG · 17	gpio	PK0	A8 (ADC8), A8, PK0, ADC8, PCINT16	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A9	JANALOG · 18	gpio	PK1	A9 (ADC9), A9, PK1, ADC9, PCINT17	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A10	JANALOG · 19	gpio	PK2	A10 (ADC10), A10, PK2, ADC10, PCINT18	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A11	JANALOG · 20	gpio	PK3	A11 (ADC11), A11, PK3, ADC11, PCINT19	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A12	JANALOG · 21	gpio	PK4	A12 (ADC12), A12, PK4, ADC12, PCINT20	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A13	JANALOG · 22	gpio	PK5	A13 (ADC13), A13, PK5, ADC13, PCINT21	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A14	JANALOG · 23	gpio	PK6	A14 (ADC14), A14, PK6, ADC14, PCINT22	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
A15	JANALOG · 24	gpio	PK7	A15 (ADC15), A15, PK7, ADC15, PCINT23	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D21	JDIGITAL · 1	gpio	PD0	D21, I2C SCL (Wire), PD0, SCL, INT0	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D20	JDIGITAL · 2	gpio	PD1	D20, I2C SDA (Wire), PD1, SDA, INT1	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
AREF	JDIGITAL · 3	power in	AREF	power_in									ATmega2560-16AU datasheet p.410 table 410_1
GND	JDIGITAL · 4	ground		ground
D13	JDIGITAL · 5	gpio	PB7	D13, PWM (analogWrite), LED_BUILTIN (PB7), PB7, OC0A, OC1C, PCINT7	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D12	JDIGITAL · 6	gpio	PB6	D12, PWM (analogWrite), PB6, OC1B, PCINT6	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D11	JDIGITAL · 7	gpio	PB5	D11, PWM (analogWrite), PB5, OC1A, PCINT5	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D10	JDIGITAL · 8	gpio	PB4	D10, PWM (analogWrite), PB4, OC2A, PCINT4	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D9	JDIGITAL · 9	gpio	PH6	D9, PWM (analogWrite), PH6, OC2B	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D8	JDIGITAL · 10	gpio	PH5	D8, PWM (analogWrite), PH5, OC4C	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D7	JDIGITAL · 11	gpio	PH4	D7, PWM (analogWrite), PH4, OC4B	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D6	JDIGITAL · 12	gpio	PH3	D6, PWM (analogWrite), PH3, OC4A	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D5	JDIGITAL · 13	gpio	PE3	D5, PWM (analogWrite), PE3, OC3A, AIN1	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D4	JDIGITAL · 14	gpio	PG5	D4, PWM (analogWrite), PG5, A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A ( A C F C D E_{0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7} D C_{7 0 1 2} V N R F F F F F F F F K K K K K K K K N C J A A A A G A P P P P P P P P P P P P P P P P G V P P P P 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 (OC0B	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D3	JDIGITAL · 15	gpio	PE5	D3, PWM (analogWrite), PE5, OC3C, INT5	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D2	JDIGITAL · 16	gpio	PE4	D2, PWM (analogWrite), PE4, OC3B, INT4	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D1	JDIGITAL · 17	gpio	PE1	D1, Serial TX0 (USB via ATmega16U2), PE1, TXD0	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D0	JDIGITAL · 18	gpio	PE0	D0, Serial RX0 (USB via ATmega16U2), PE0, RXD0, PCINT8	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D14	JDIGITAL · 19	gpio	PJ1	D14, Serial3 TX3, PJ1, TXD3, PCINT10	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D15	JDIGITAL · 20	gpio	PJ0	D15, Serial3 RX3, PJ0, RXD3, PCINT9	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D16	JDIGITAL · 21	gpio	PH1	D16, Serial2 TX2, PH1, TXD2	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D17	JDIGITAL · 22	gpio	PH0	D17, Serial2 RX2, PH0, RXD2	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D18	JDIGITAL · 23	gpio	PD3	D18, Serial1 TX1, PD3, TXD1, INT3	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D19	JDIGITAL · 24	gpio	PD2	D19, Serial1 RX1, PD2, RXD1, INT2	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D20	JDIGITAL · 25	gpio	PD1	D20, I2C SDA (Wire), PD1, SDA, INT1	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D21	JDIGITAL · 26	gpio	PD0	D21, I2C SCL (Wire), PD0, SCL, INT0	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
+5V	XIO (2x18 double header) · 1	power out		power_out									p.11 table 11_1
D22	XIO (2x18 double header) · 2	gpio	PA0	D22, PA0, AD0	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D24	XIO (2x18 double header) · 3	gpio	PA2	D24, PA2, AD2	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D26	XIO (2x18 double header) · 4	gpio	PA4	D26, PA4, AD4	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D28	XIO (2x18 double header) · 5	gpio	PA6	D28, PA6, AD6	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D30	XIO (2x18 double header) · 6	gpio	PC7	D30, PC7, A15	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D32	XIO (2x18 double header) · 7	gpio	PC5	D32, PC5, A13	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D34	XIO (2x18 double header) · 8	gpio	PC3	D34, PC3, A11	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D36	XIO (2x18 double header) · 9	gpio	PC1	D36, PC1, A9	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D38	XIO (2x18 double header) · 10	gpio	PD7	D38, PD7, T0	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D40	XIO (2x18 double header) · 11	gpio	PG1	D40, PG1, RD	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D42	XIO (2x18 double header) · 12	gpio	PL7	D42, PL7	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D44	XIO (2x18 double header) · 13	gpio	PL5	D44, PWM (analogWrite), PL5, OC5C	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D46	XIO (2x18 double header) · 14	gpio	PL3	D46, PWM (analogWrite), PL3, OC5A	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D48	XIO (2x18 double header) · 15	gpio	PL1	D48, PL1, ICP5	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D50	XIO (2x18 double header) · 16	gpio	PB3	D50, SPI CIPO, PB3, MISO, PCINT3	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D52	XIO (2x18 double header) · 17	gpio	PB1	D52, SPI SCK, PB1, SCK, PCINT1	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
GND	XIO (2x18 double header) · 18	ground		ground
+5V	XIO (2x18 double header) · 1	power out		power_out									p.11 table 11_1
D23	XIO (2x18 double header) · 2	gpio	PA1	D23, PA1, AD1	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D25	XIO (2x18 double header) · 3	gpio	PA3	D25, PA3, AD3	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D27	XIO (2x18 double header) · 4	gpio	PA5	D27, PA5, AD5	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D29	XIO (2x18 double header) · 5	gpio	PA7	D29, PA7, AD7	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D31	XIO (2x18 double header) · 6	gpio	PC6	D31, PC6, A14	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D33	XIO (2x18 double header) · 7	gpio	PC4	D33, PC4, A12	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D35	XIO (2x18 double header) · 8	gpio	PC2	D35, PC2, A10	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D37	XIO (2x18 double header) · 9	gpio	PC0	D37, PC0, A8	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D39	XIO (2x18 double header) · 10	gpio	PG2	D39, PG2, ALE	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D41	XIO (2x18 double header) · 11	gpio	PG0	D41, PG0, WR	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D43	XIO (2x18 double header) · 12	gpio	PL6	D43, PL6	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D45	XIO (2x18 double header) · 13	gpio	PL4	D45, PWM (analogWrite), PL4, OC5B	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D47	XIO (2x18 double header) · 14	gpio	PL2	D47, PL2, T5	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D49	XIO (2x18 double header) · 15	gpio	PL0	D49, PL0, ICP4	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D51	XIO (2x18 double header) · 16	gpio	PB2	D51, SPI COPI, PB2, MOSI, PCINT2	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
D53	XIO (2x18 double header) · 17	gpio	PB0	D53, SPI SS, PB0, SS, PCINT0	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
GND	XIO (2x18 double header) · 18	ground		ground
PB4	JP5 (ATmega16U2) · 1	debug	PB4	ATmega16U2 PB4, PB4, OC2A, PCINT4	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
PB6	JP5 (ATmega16U2) · 2	debug	PB6	ATmega16U2 PB6, PB6, OC1B, PCINT6	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
PB5	JP5 (ATmega16U2) · 3	debug	PB5	ATmega16U2 PB5, PB5, OC1A, PCINT5	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
PB7	JP5 (ATmega16U2) · 4	debug	PB7	ATmega16U2 PB7, PB7, OC0A, OC1C, PCINT7	3–5.5 V	-0.5–1.5 V	≥ 4.2 V	≤ 0.9 V	≤ 40 mA	≤ 40 mA	yes	-0.5–5.5 V	ATmega2560-16AU datasheet p.355
CIPO	ICSP1 (ATmega16U2) · 1	debug		ATmega16U2 CIPO
+5V	ICSP1 (ATmega16U2) · 2	power out		power_out									p.11 table 11_1
SCK	ICSP1 (ATmega16U2) · 3	debug		ATmega16U2 SCK
COPI	ICSP1 (ATmega16U2) · 4	debug		ATmega16U2 COPI
RESET	ICSP1 (ATmega16U2) · 5	control	RESET	ATmega16U2 RESET	4.5–5.5 V	-0.5–0.5 V						-0.5–13 V	ATmega2560-16AU datasheet p.355 table 355_1
GND	ICSP1 (ATmega16U2) · 6	ground		ground

Answers from the record

Arduino Mega 2560 Rev3 pinout FAQ

What microcontroller does the Arduino Mega 2560 Rev3 use?

The Arduino Mega 2560 Rev3 is built around the ATmega2560-16AU, alongside ATmega16U2, 5V linear regulator (part not named).

How many GPIO pins does the Arduino Mega 2560 Rev3 have?

54 GPIO pins are exposed. Xirkit documents 96 board pins, 78 of them with pin-level electrical limits.

Are the Arduino Mega 2560 Rev3 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 Mega 2560 Rev3 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 Mega 2560 Rev3?

Supply range 4.5–12 V. Power inputs: VIN (7–12 V), AREF (4.5–5.5 V).

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