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One of the new ways into the world of electronic innovation is the SMD Arduino UNO R3 Development Board with Cable.
This board is totally different from the Arduino Uno R3. Uno R3 and Uno R3 SMD both boards are based on the ATmega328P Microcontroller but the difference is that the UNO R3 is through-hole version, and this is an SMD version or Surface Mount Device version.
A SMD or surface-mount device is an electronic component that is mounted directly onto the surface of a printed circuit board (PCB), rather than being inserted through holes.
The board has dimensions of 7 x 5 x 1cm and comes to the fore as a compact and reliable choice for both beginners and experienced electronics enthusiasts.
It is designed with 14 digital input/output pins, 6 analog inputs, a 16MHz crystal oscillator, a USB connection, and the CH340G USB to UART Converter Chip, this development board is a perfect match for the electronic prototypes that you want to build with Arduino.
This Arduino programming board is a must-have if you’re into robotics, IoT, home automation, and security system projects.
If your projects are large or small, this Arduino UNO R3 ATmega328P SMD microcontroller brings to you a whole lot of potential and creativity.
| Specification | UNO Wifi | UNO SMD | UNO R3 |
| Microcontroller | ATmega4809 | ATmega328P (SMD) | ATmega328P (Through hole) |
| USB connector | Micro-USB | USB-B | USB-B |
| Digital I/O Pins | 14 | 14 | 14 |
| Analog input pins | 6 | 6 | 6 |
| PWM pins | 5 | 6 | 6 |
| UART | Yes | Yes | Yes |
| I2C | Yes | Yes | Yes |
| SPI | Yes | Yes | Yes |
| I/O Voltage | 5V | 5V | 5V |
| Input voltage (nominal) | 7-12V | 7-12V | 7-12V |
| DC Current per I/O Pin | 20mA | 20 mA | 20 mA |
| Power Supply Connector | Barrel Plug | Barrel Plug | Barrel Plug |
| clock speed | 16 MHz | 16 MHz | 16 MHz |
| USB-Serial chip | ATmega16U2 | CH340 | ATmega16U2 |
| SRAM | 6.144KB | 2KB | 2KB |
| Flash Memory | 48KB | 32KB | 32KB |
| EEPROM | 256 Bytes | 1KB | 1KB |
| Dimensions | 68.6 mm x 53.4 mm | 68.6 mm x 53.4 mm | 68.6 mm x 53.4 mm |
| RADIO MODULE | u-blox NINA-W102 | - | - |
| Inertial Measurement Unit | LSM6DS3TR (3D accelerometer) | - | - |
| LED_BUILTIN | 25 | 13 | 13 |
| Wi-Fi Microprocessor | Yes | - | - |
| Feature | Original Arduino UNO | Compatible SMD UNO |
|---|---|---|
| Microcontroller | ATmega328P (DIP) | ATmega328P (SMD) |
| Build Type | Through-hole components | Surface-mount components |
| Chip Replaceability | Removable and replaceable | Fixed (non-removable) |
| Size | Slightly larger | More compact |
| Performance | Same processing power | Same processing power |
| USB Interface | ATmega16U2 | CH340 or similar USB-to-Serial chip |
| Ease of Repair | Easier (replaceable chip) | Harder to repair |
| Cost | Slightly higher | More affordable |
| Durability | Very robust | Slightly less robust mechanically |
| Best For | Learners who want to experiment with hardware | Budget-friendly, compact projects |
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