Arduino UNO R3 SMD is a version of the Arduino Uno, but uses a surface mount version of the Atmega328 instead of the through-hole version. This version was made in response to a shortage in supply of the through-hole Atmega328P. The board is based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analogue inputs, a 16MHz 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 an AC-to-DC adapter or battery to get started.
The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega8U2 programmed as a USB-to-serial converter.
This is the SMD version. This version has the ATmega chip is surface mounted to the board, so the chip cannot be easily replaced, unlike the original where the chip can be easily pulled out and replaced. Performance will be the same as the original.
ESP32 38 Pin Development Board — WiFi + Bluetooth Dual Core 
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