Arduino Uno compatible R3 with CH340 c/w cable
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Arduino Uno compatible R3 with CH340 c/w cable


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SKU: #SB-A-00234 Category:



The Uno R3 SMD is an Uno compatible version of the latest R3 iteration of the Arduino Uno, which is the most popular of the many development boards available for hobbyists.  It uses an SMD version of the microprocessor rather than the older style DIP package used on the original product and has some additional features.


  • Uno R3  (Arduino compatible)
  • 1 x 40 break-away male header strip


  • ATmega328 processor running at 16MHz
  • CH340 Serial to USB converter
  • 32KB Flash memory
  • 14 Digital I/O
  • 6 PWM shared with the digital I/O
  • 6 Analog inputs that can also be used as digital I/O for a total of up to 20 digital I/O
  • 1 Hardware serial port
  • 5V Operation

The Uno R3 SMD operates at 5V which can be supplied via an external power supply or through the USB port connection.  The power source is selected automatically if both are available.  If an external supply is used, it is recommended to use a supply between 7-12V.  Higher input voltages will cause the on-board regulator to work harder and may cause it to overheat.  Our 7.5V AC adapter works extremely well for powering these boards.

A great feature on this version of the board is that besides the standard female headers for bringing out I/O, each female header also has a row of holes next to it to which can be soldered male headers, a second row of female headers or even wires.  These can be soldered to either the top or bottom side of the board.  The board comes with a strip of male headers which are normally soldered to the top side of the board as shown in one of the pictures.  If the male headers are soldered to the bottom of the board, the board can’t be mounted directly into a breadboard since the separate sections of headers on one side are not spaced apart on 0.1″ centers and the holes are offset somewhat side-to-side.

The board also has an array of solder points which gives another place to access I2C (SCL/SDA), Serial (TX/RC), 3.3V, 5V and GND which can come in handy.

Like all Arduino compatible boards, it can be programmed using the Arduino IDE via the USB port.


Microcontroller ATmega328P
Serial to USB Converter CH340
Operating Voltage 5V
Input Voltage 7-12V
Digital I/O Pins 14
PWM I/O Pins (Shared with Digital I/O) 6
Analog Input Pins 6
DC Current per I/O Pin 20mA
DC Current which can be drawn from 3.3V Pin 50mA
Flash Memory 32 KBytes
SRAM 2 KBytes
Clock Speed 16MHz
Built-in LED Attached to digital I/O Pin 13
USB Connector Style B-Type Female
Board Dimensions (PCB) 68.8 x 53.4mm (2.7 x 2.1″)
Board Dimensions (with connector overhang) 77 x 53.4mm  (3 x 2.1″)


Packing list

x1 unit Uno compatible R3 with CH340 c/w cable

x1 unit USB B cable