Published 19 Oct 2026

Uno SMD clone

\\ {{ electronic:boards:arduino:pa204428a.jpg?200|Uno SMD clone overview}} ^ Module Description || ^Model|**Uno SMD clone**| ^Manufacturer|made in China| ^Brand| | ^Clone of|Arduino Uno R3 SMD| ^Description|Standard Uno using SMD cpu| ^Voltage|5V| ===== Overview ===== This is a budget no-name Arduino Uno SMD clone with an CH340G USB interface rather than an ATmega16U2. I also note both the genuine Arduino Uno SMD and this one use a ceramic resonator instead of a more precise and stable 16MHz crystal oscillator. My example had a very crookedly mounted USB-B socket, and when I tried to resolder it flat onto the board it shorted something, disabling the USB port - so had to undo my fix :-(, and put up with it pressing on the underside of any Arduino shield mounted above. So a cheap Arduino Uno clone for applications not requiring precise timing or expectations of longevity :-). ===== Features ===== * Microcontroller: ATmega328P * Clock Speed: 16 MHz ceramic resonator * 14 digital input/output pins (6 can be PWM outputs) * 6 analog inputs * Operating Voltage: 5V * Input Voltage: 7-12V * 3.3V Power Out: up to 50 mA * I/O Pin Out: up to 20 mA * Digital I/O Pins: 14 (6 support PWM output) * Analog Input Pins: 6 (with 10-bit resolution) * Flash Memory: 32 kB (2kB used by bootloader) * SRAM: 2 kB * EEPROM: 1 KB * Serial I/O: 4 UARTs, one SPI and one I2C interface \\ ---- ===== Schematics ===== /* {{electronic:boards:arduino:uno_pighixxx.png?800|Pinout (unofficial)}} ((from https://web.archive.org/web/20171110175921/http://www.pighixxx.com/test/wp-content/uploads/2014/11/uno.png CCBYSA Alberto Piganti)) {{electronic:boards:arduino:a000066-pinout.png?800|Pinout}} ((from https://docs.arduino.cc/resources/pinouts/A000066-full-pinout.pdf CCBYSA Arduino.cc)) */ {{electronic:boards:arduino:arduino-uno-rev-3-smd-clone-pinout-high-resolution.png?800|Pinout}} ((from https://mischianti.org/arduino-uno-rev-3-ch340-smd-clone-high-resolution-pinout-datasheet-and-specs/ CCBYNCND mischianti.org)) {{electronic:boards:arduino:ch340g_uno_arduinoboard_3a_bw.png?800|Arduino UNO schematic}} ((from https://www.mikrocontroller.net/attachment/258727/CH340G_UNO_ArduinoBoard_3.pdf CCBYSA)) Seems to be the same as this schematic but an MIC5205-3.3YM5 (labelled KB33 on a SOT-23-5 SMD chip) has been substituted for the LP2985-33 LDO regulator. \\ ---- ===== Examples ===== {{electronic:boards:arduino:pa204428a.jpg?800|Uno SMD clone overview right}} {{electronic:boards:arduino:pa204429a.jpg?800|Uno SMD clone overview left}} {{electronic:boards:arduino:pa204430a.jpg?800|Uno SMD clone overview back}} {{electronic:boards:arduino:pa204422a.jpg?800|Uno SMD clone top view}} {{electronic:boards:arduino:pa204427a.jpg?800|Uno SMD clonebottom view}} \\ ---- ^Genuine Arduino Uno R3 SMD :^ /* {{electronic:boards:arduino:arduino_uno_microcontroller.jpg?800|Genuine Arduino Uno R3 SMD top view}}((from https://commons.wikimedia.org/wiki/File:Arduino_UNO_microcontroller.jpg CCBYSA Alyona Makarenko)) */ {{electronic:boards:arduino:arduinounosmd.jpg?800|Genuine Arduino Uno R3 SMD top view}} ((from http://arduino.cc/en/uploads/Main/ArduinoUnoSmd.jpg CCBYSA arduino.cc)) ====== References and Additional Resources ====== * {{https://mischianti.org/wp-content/uploads/2023/11/Arduino-UNO-Rev-3-CH340-SMD-clone-manual.pdf|A Uno SMB clone manual}} * [[https://docs.arduino.cc/hardware/uno-rev3-smd|Arduino UNO SMD docs (genuine version)]] * {{https://docs.arduino.cc/resources/pinouts/A000066-full-pinout.pdf|Pinout details (genuine version)}} * {{https://docs.arduino.cc/resources/schematics/A000066-schematics.pdf|Schematic (genuine version)}}

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