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This is an Atmel ATmega328-PU 8-bit microcontroller chip, supplied in the 28-pin DIP (dual in-line package) form, with the Arduino Uno bootloader already installed. That pre-installed bootloader is the key detail: rather than needing a separate programmer to burn the bootloader before first use, this chip can be dropped straight into a breadboard or custom board and programmed directly from the Arduino IDE over a serial connection, exactly like the chip already fitted to an Uno board.
It is configured for the UNO core version, uses an external 16MHz crystal for timing, matching the clock speed Arduino sketches and libraries expect by default, and runs at a 5V working voltage, the same as a standard Arduino Uno.
Because it comes in a socketable DIP package rather than a surface-mount chip, it's straightforward to remove from an Uno board, breadboard prototype, or custom PCB and replace if it's ever damaged, or to build several standalone Arduino-compatible circuits using just this chip, a crystal, and some basic support components rather than a full Uno board for each one. It's noted as suitable for Arduino UNO R3 and the earlier Arduino 2011 Uno development board specifically.
This kind of bare, bootloaded chip is a common building block for anyone moving a finished Arduino project off a full development board and onto a smaller, permanent custom circuit, since it keeps full compatibility with existing Arduino sketches while cutting down on unnecessary hardware.
Anyone building a standalone Arduino-compatible circuit, replacing a damaged chip on an existing Uno board, or moving a finished project from a full development board onto custom hardware will find this bootloaded chip a direct, drop-in solution.
Yes, the Arduino Uno bootloader is pre-installed.
A 28-pin DIP (dual in-line) package.
An external 16MHz crystal.
5V.
Arduino UNO R3 and the Arduino 2011 Uno board.
| Brand | Generic |
|---|---|
| Selling unit | PCS |
