{"product_id":"atmega328p-pu-8-bit-avr-microcontroller-dip-28-with-without-arduino-bootloader","title":"ATMEGA328P-PU (8-Bit AVR Microcontroller - DIP-28) — With \u0026 Without Arduino Bootloader","description":"\u003cp data-path-to-node=\"5\" id=\"p-rc_69443e24865dbca7-354\"\u003e\u003cspan class=\"citation-427\"\u003eThe \u003c\/span\u003e\u003cb data-path-to-node=\"5\" data-index-in-node=\"4\"\u003e\u003cspan class=\"citation-427\"\u003eATMEGA328P-PU\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-427 citation-end-427\"\u003e is the legendary 28-pin, through-hole (DIP) microcontroller that powers the classic Arduino Uno.\u003csup class=\"superscript\" data-turn-source-index=\"1\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-426 citation-end-426\"\u003eIt is the absolute standard for breadboard prototyping, custom DIY circuitry, and educational electronics.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-425 citation-end-425\"\u003eIt boasts a highly robust 5V-tolerant architecture, 32KB of Flash memory, and plenty of hardware peripherals (UART, SPI, I2C, PWM) to drive everything from simple LED arrays to complex telemetry networks.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003eHowever, when purchasing this chip, the most critical decision you will make is whether to buy it \u003cb data-path-to-node=\"6\" data-index-in-node=\"98\"\u003e\"With a Bootloader\"\u003c\/b\u003e or \u003cb data-path-to-node=\"6\" data-index-in-node=\"121\"\u003e\"Without a Bootloader\"\u003c\/b\u003e (Bare Silicon). The physical hardware is identical in both cases; the difference lies entirely in the software pre-flashed onto the chip's memory before it ships to you.\u003c\/p\u003e\n\u003ch4 data-path-to-node=\"7\"\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"0\"\u003eOption 1: WITH Bootloader (The \"Arduino-Ready\" Version)\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp data-path-to-node=\"8\" id=\"p-rc_69443e24865dbca7-355\"\u003e\u003cspan class=\"citation-424 citation-end-424\"\u003eWhen you buy an ATmega328P with a bootloader, it has been pre-flashed with a tiny piece of software—usually the \"Optiboot\" bootloader used by the Arduino Uno.\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"9\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,0,0\"\u003e\u003cb data-path-to-node=\"9,0,0\" data-index-in-node=\"0\"\u003eThe Advantage:\u003c\/b\u003e This chip is pure plug-and-play. You can drop it directly into an empty Arduino Uno socket to repair a fried board, or place it on a breadboard and program it instantly using a standard USB-to-Serial adapter (like an FTDI or CH340). The Arduino IDE will recognize it immediately.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,1,0\"\u003e\u003cb data-path-to-node=\"9,1,0\" data-index-in-node=\"0\"\u003eThe Trade-off:\u003c\/b\u003e The bootloader permanently reserves a tiny fraction of your Flash memory (about 0.5KB to 2KB depending on the version). Additionally, there is a slight 1-to-2 second delay every time the chip powers on, as the bootloader pauses to listen for a new USB upload before running your actual code.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-path-to-node=\"10\"\u003e\u003cb data-path-to-node=\"10\" data-index-in-node=\"0\"\u003eOption 2: WITHOUT Bootloader (The \"Bare Metal\" Version)\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp data-path-to-node=\"11\"\u003eWhen you buy the chip without a bootloader, it is a factory-blank slate directly from Microchip\/Atmel.\u003c\/p\u003e\n\u003cul data-path-to-node=\"12\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,0,0\"\u003e\u003cb data-path-to-node=\"12,0,0\" data-index-in-node=\"0\"\u003eThe Advantage:\u003c\/b\u003e You get access to the entire, unadulterated 32KB of Flash memory for your code. Furthermore, because there is no bootloader waiting for a USB signal, your code begins executing the exact millisecond power is applied. This is the preferred choice for mass production and highly optimized, timing-critical bare-metal C programming.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,1,0\"\u003e\u003cb data-path-to-node=\"12,1,0\" data-index-in-node=\"0\"\u003eThe Trade-off:\u003c\/b\u003e You \u003ci data-path-to-node=\"12,1,0\" data-index-in-node=\"19\"\u003ecannot\u003c\/i\u003e program this chip using a simple USB-to-Serial adapter out of the box. To put code on this chip, you must use a dedicated ISP (In-System Programmer)—such as a USBasp, an AVRISP mkII, or another Arduino wired as an \"Arduino as ISP\"—to flash your firmware directly via the chip's SPI pins (MISO, MOSI, SCK, and RESET).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"13\"\u003e\u003cb data-path-to-node=\"13\" data-index-in-node=\"0\"\u003eKey Features \u0026amp; Functional Advantages:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"14\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,0,0\"\u003e\u003cb data-path-to-node=\"14,0,0\" data-index-in-node=\"0\"\u003eBreadboard Native (DIP-28):\u003c\/b\u003e The standard 0.1-inch pin pitch makes it incredibly easy to snap into a solderless breadboard for rapid prototyping or drop into a socketed PCB.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,1,0\"\u003e\u003cb data-path-to-node=\"14,1,0\" data-index-in-node=\"0\"\u003eRobust 5V Logic:\u003c\/b\u003e Natively operates at 5V, allowing for direct interfacing with classic industrial sensors, relays, and character LCDs without delicate level shifters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,2,0\" id=\"p-rc_69443e24865dbca7-356\"\u003e\u003cb data-path-to-node=\"14,2,0\" data-index-in-node=\"0\"\u003ePicoPower Technology:\u003c\/b\u003e\u003cspan class=\"citation-423 citation-end-423\"\u003e Supports ultra-deep sleep modes that draw mere microamps, making it perfect for battery-operated field sensors.\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,3,0\"\u003e\u003cb data-path-to-node=\"14,3,0\" data-index-in-node=\"0\"\u003eFlexible Clock Sources:\u003c\/b\u003e Can run on its internal 8MHz oscillator for low-part-count projects, or be paired with an external 16MHz crystal for high-speed, precise timing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"15\"\u003e\u003cb data-path-to-node=\"15\" data-index-in-node=\"0\"\u003ePerfect For:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"16\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,0,0\"\u003e\u003cb data-path-to-node=\"16,0,0\" data-index-in-node=\"0\"\u003eArduino Uno Repairs (With Bootloader):\u003c\/b\u003e The cheapest, fastest way to bring a dead Arduino Uno back to life. Just pry out the old chip and push the new one in.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,1,0\"\u003e\u003cb data-path-to-node=\"16,1,0\" data-index-in-node=\"0\"\u003eStandalone Breadboard Arduinos:\u003c\/b\u003e Ideal for stripping your project off a development board and running it on a permanent piece of perfboard.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,2,0\"\u003e\u003cb data-path-to-node=\"16,2,0\" data-index-in-node=\"0\"\u003eCustom PCB Production (No Bootloader):\u003c\/b\u003e The most cost-effective way to buy the silicon in bulk when manufacturing your own custom, programmed-in-circuit hardware.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,3,0\"\u003e\u003cb data-path-to-node=\"16,3,0\" data-index-in-node=\"0\"\u003eLearning Bare-Metal AVR:\u003c\/b\u003e The definitive chip for learning how to manipulate hardware registers directly in C, bypassing the overhead of the Arduino framework.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"17\"\u003e\u003cb data-path-to-node=\"17\" data-index-in-node=\"0\"\u003eTechnical Specifications:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"18\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,0,0\" id=\"p-rc_69443e24865dbca7-357\"\u003e\u003cspan class=\"citation-422\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"18,0,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-422\"\u003eCore Processor:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-422 citation-end-422\"\u003e 8-Bit AVR RISC\u003csup class=\"superscript\" data-turn-source-index=\"6\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,1,0\" id=\"p-rc_69443e24865dbca7-358\"\u003e\u003cb data-path-to-node=\"18,1,0\" data-index-in-node=\"0\"\u003eMaximum Clock Speed:\u003c\/b\u003e\u003cspan class=\"citation-421 citation-end-421\"\u003e 20 MHz (Commonly clocked at 16 MHz with an external crystal for Arduino compatibility)\u003csup class=\"superscript\" data-turn-source-index=\"7\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,2,0\"\u003e\u003cb data-path-to-node=\"18,2,0\" data-index-in-node=\"0\"\u003eProgram Memory (Flash):\u003c\/b\u003e 32 KB\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,3,0\"\u003e\u003cb data-path-to-node=\"18,3,0\" data-index-in-node=\"0\"\u003eSRAM:\u003c\/b\u003e 2 KB\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,4,0\"\u003e\u003cb data-path-to-node=\"18,4,0\" data-index-in-node=\"0\"\u003eEEPROM:\u003c\/b\u003e 1 KB\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,5,0\" id=\"p-rc_69443e24865dbca7-359\"\u003e\u003cspan class=\"citation-420\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"18,5,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-420\"\u003eOperating Voltage Range:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-420 citation-end-420\"\u003e 1.8V – 5.5V\u003csup class=\"superscript\" data-turn-source-index=\"8\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,6,0\"\u003e\u003cb data-path-to-node=\"18,6,0\" data-index-in-node=\"0\"\u003eTotal I\/O Pins:\u003c\/b\u003e 23\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,7,0\" id=\"p-rc_69443e24865dbca7-360\"\u003e\u003cspan class=\"citation-419\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"18,7,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-419\"\u003eAnalog-to-Digital Converter (ADC):\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-419 citation-end-419\"\u003e 6 Channels, 10-bit resolution (DIP package specific)\u003csup class=\"superscript\" data-turn-source-index=\"9\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,8,0\" id=\"p-rc_69443e24865dbca7-361\"\u003e\u003cspan class=\"citation-418\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"18,8,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-418\"\u003eCommunication Interfaces:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-418 citation-end-418\"\u003e 1 x UART\/USART, 1 x SPI, 1 x I2C (Two-Wire Interface)\u003csup class=\"superscript\" data-turn-source-index=\"10\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,9,0\" id=\"p-rc_69443e24865dbca7-362\"\u003e\u003cb data-path-to-node=\"18,9,0\" data-index-in-node=\"0\"\u003ePackage \/ Case:\u003c\/b\u003e\u003cspan class=\"citation-417 citation-end-417\"\u003e 28-DIP (0.300\", 7.62mm width)\u003csup class=\"superscript\" data-turn-source-index=\"11\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,10,0\"\u003e\u003cb data-path-to-node=\"18,10,0\" data-index-in-node=\"0\"\u003eMounting Type:\u003c\/b\u003e Through-Hole (PTH)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"K-TECHNICS","offers":[{"title":"With Bootloader","offer_id":42908294381639,"sku":null,"price":550.0,"currency_code":"KES","in_stock":true},{"title":"Without Bootloader","offer_id":42908294414407,"sku":null,"price":550.0,"currency_code":"KES","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/7637\/2039\/files\/ATMEGA328P-PU-BOOT-Main-500x500.webp?v=1780986228","url":"https:\/\/www.ktechnics.com\/products\/atmega328p-pu-8-bit-avr-microcontroller-dip-28-with-without-arduino-bootloader","provider":"K-TECHNICS","version":"1.0","type":"link"}