Arduino Leonardo without Headers

SKU: rz24316404
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  1. ATmega32U4 Microcontroller
  2. Input Voltage: 7-12V
  3. 20 Digital I/O Pins
  4. micro USB connection
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The latest addition to the Arduino family is here! The Arduino Leonardo is a microcontroller board based on the exciting USB-enabled ATmega32u4 (datasheet). This chip has about the same amount of flash, RAM, and capability as the ATmega328 found in the UNO. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a spot for a 2.1mm power jack, an ICSP header breakout, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable to get started.

This version of the Leonardo does not come with any headers attached for an ultra-thin, light-weight Arduino!

The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary chip (such as an FTDI friend, FTDI cable or the USB/Serial converter on the UNO). On one hand this means that sketches on the Leo are a little bigger because it’s also handling USB interaction. On the other hand, it allows the Leonardo to appear to a connected computer as a mouse and/or keyboard, in addition to a virtual (CDC) serial / COM port. It also has other implications for the behavior of the board; these are detailed on the getting started page.

This board is only supported in the latest Arduino IDE 1.0.1 so you will also need to update the IDE.

Features and Specifications:
  1. ATmega32U4 Microcontroller
    1. Clock frequency: 16MHz
    2. Flash memory: 32KB
    3. SRAM: 2.5KB
    4. EEPROM: 1KB
  2. Input Voltage: 7-12V
  3. 20 Digital I/O Pins
  4. 7 PWM Channels
  5. 12 ADCs
  6. 16MHz Clock Speed
  7. 32 KB Flash Memory
  8. micro USB connection

Useful Links:

Package Includes:

1 x Arduino Leonardo without Headers

Additional information

Model Type


Microcontroller Chip


Operating Voltage (VDC)


Input Voltage(Recommended)

7V to 12V

Input Voltage (limit)


Analog I/O Pins


Digital I/O Pins


PWM Digital I/O Pins


Clock Speed

16 MHz

Flash Memory

32 KB (ATmega32u4) of which 4 KB used by bootloader


2.5 KB (ATmega32u4)


1 KB (ATmega328)

Weight (gm)


Length (mm)


Width (mm)