Arduino Mega 2560 Revision 3

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  • Jameco Part no.: 2152366
  • Manufacturer: Arduino
  • Manufacturer no.: A000067
  • HTS code: 8537109060
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Start controlling the world around you with Jameco's wide selection of Arduino Boards & products. These microcontroller boards are the most robust and documented boards on the market. Choose from the Arduino Uno, Arduino Motor Shield, DFRobot Relay Module, and more. We also carry the perfect board for more powerful projects like the Arduino Due - this board contains everything you need to support the microcontroller.

Arduino Mega 2560 (Revision 3)

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The Arduino Mega 2560 is a microcontroller board based on the ATmega2560 (datasheet). It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. The Mega is compatible with most shields designed for the Arduino Duemilanove or Diecimila.

The Mega 2560 is an update to the Arduino Mega, which it replaces.

The Mega2560 differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the ATmega16U2 (ATmega8U2 in the revision 1 and revision 2 boards) programmed as a USB-to-serial converter.
Revision 2 of the Mega2560 board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.

Revision 3 of the board has the following new features:
  • 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the Arduino Due that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
  • Stronger RESET circuit.
  • Atmega 16U2 replace the 8U2.


  • Microcontroller: ATmega2560
  • Operating Voltage: 5V
  • Input Voltage (recommended): 7-12V
  • Input Voltage (limits): 6-20V
  • Digital I/O Pins: 54 (of which 14 provide PWM output)
  • Analog Input Pins: 16
  • DC Current per I/O Pin: 40 mA
  • DC Current for 3.3V Pin: 50 mA
  • Flash Memory: 256 KB of which 8 KB used by bootloader
  • SRAM: 8 KB
  • EEPROM: 4 KB
  • Clock Speed: 16 MHz

Schematic, Reference Design & Pin Mapping

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Resources & Downloads

Arduino Documentary: Open Source Hardware is Here

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Specification Value
Design LevelBeginner
Family8-bit AVR
Number of I/Os70
PWM Channels16
Input Voltage Range7 VDC to 12 VDC
Memory8 KB SRAM
Length4.00 in., 101.60 mm
Width2.10 in., 53.34 mm

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