ATMEGA328P-AU

LCSC lists the ATMEGA328P-AU with the following volume pricing: 1+ at $2.348, 10+ at $2.045, 30+ at $1.8242, 250+ at $1.854, 500+ at $1.5695, and 1,000+ at $1.5242 per piece. The minimum order quantity is 1 piece and the standard packaging is 250 pieces per Full Tray. Current in-stock quantity is 8,070 units available for immediate shipment. The part is RoHS compliant with an ECCN of EAR99 and CNHTS code 8542390090. As a widely-used Microchip MCU, it is also available through major global distributors including Digi-Key and Mouser for additional sourcing flexibility.

The ATMEGA328P-AU is housed in a TQFP-32 (7x7mm) surface-mount package with a 0.8mm pin pitch, providing 23 programmable I/O pins. The QFP footprint is compatible with standard IPC-7351-compliant land patterns and is supported with EDA models available on LCSC, simplifying PCB design. The compact 7x7mm body makes it suitable for space-constrained designs. Designers should provide adequate decoupling capacitors on all VCC and AVCC pins per Microchip's recommended PCB layout guidelines. The built-in oscillator eliminates the need for an external crystal in many applications, saving board space and BOM cost.

The ATMEGA328P-AU operates across a wide supply voltage range of 1.8V to 5.5V, making it compatible with both 3.3V and 5V power domains without additional regulation in many designs. The integrated 10-bit ADC provides a resolution of 1/1024 of the reference voltage — on a 5V reference, this gives approximately 4.88mV per LSB. This resolution is adequate for temperature sensing, potentiometer reading, light sensing, pressure transducer interfaces, and battery monitoring. The operating temperature range is -40°C to +85°C, qualifying it for industrial and outdoor applications that experience wide ambient temperature excursions.

The ATMEGA328P-AU provides three on-chip memory types: 32KB of self-programmable in-system FLASH for firmware storage, 1KB of EEPROM for non-volatile data retention across power cycles (such as calibration constants or device configuration), and internal SRAM (refer to datasheet for SRAM size). The 32KB FLASH supports projects of significant complexity — it is the same flash capacity used in the Arduino Uno, which runs full networking stacks and sensor fusion libraries. The in-system programmability means firmware can be updated via the SPI interface without removing the device from the board, simplifying field maintenance and manufacturing programming.

The ATMEGA328P-AU is an 8-bit microcontroller built on Microchip's (formerly Atmel) AVR RISC architecture, operating at a maximum CPU speed of 20MHz with a built-in oscillator. It features 32KB of in-system programmable FLASH program storage, 1KB of EEPROM, and a 10-bit ADC. Housed in a TQFP-32 (7x7mm) package with 23 I/O pins, it is well-suited for embedded control, sensor acquisition, motor control, communication protocol bridging, and IoT edge applications. The wide supply voltage range of 1.8V–5.5V accommodates both 3.3V and 5V system designs without additional level-shifting.