ATMEGA3209-AU
ATMEGA3209-AU - 8-bit AVR MCU 32KB 20MHz TQFP-48 | Microchip
The Microchip Technology ATMEGA3209-AU is an 8-bit megaAVR 0-series microcontroller built on the AVR core with hardware multiplier, running at up to 20 MHz, integrating 32 KB Flash, 4 KB SRAM, and 256 bytes of EEPROM, and housed in a 48-pin TQFP package measuring 7x7 mm. It supports 1.8 V to 5.5 V supply voltage and exposes I2C, SPI, and UART/USART interfaces alongside multiple timer/counter and PWM peripherals.
A microcontroller (MCU) is a single-chip computer that combines a processor core, non-volatile program memory, volatile data memory, and integrated peripherals such as timers, communication interfaces, and analog converters. The ATmega3209 belongs to the megaAVR 0-series, Microchip's 8-bit MCU family that sits alongside classic ATmega and tinyAVR lines, and is notable for its Core Independent Peripherals (CIPs) and event system that allow peripheral functions to run without CPU intervention.
Key features include a maximum operating frequency of 20 MHz, 32 KB self-programmable Flash, 4 KB SRAM, 256 bytes of EEPROM, brown-out detection and power-on reset for safe Flash writes, multiple 16-bit timer/counters with PWM, and a peripheral event system that routes signals between on-chip peripherals deterministically. Functional Safety support makes this part suitable for safety-critical designs following IEC 60730 class B guidance.
Architecturally, the ATmega3209 uses the latest AVR core with a two-stage pipeline and single-cycle execution for most instructions, and an integrated hardware multiplier for accelerated arithmetic. The 48-pin package variant exposes the maximum I/O count of the family, allowing service bus support for richer peripheral routing compared with the smaller 28-, 32-, or 40-pin variants in the same series.
Typical applications include industrial control modules, home appliances, IoT sensor nodes, LED lighting controllers, and general consumer electronics where a robust 8-bit MCU with generous Flash, multiple serial ports, and Core Independent Peripherals provides deterministic behavior at low cost. Functional Safety support also enables white-good appliance designs.
When designing with this device, select supply voltage and clock frequency together because the maximum clock speed scales with VDD. Always verify brown-out detector settings before Flash programming to guarantee safe writes, and reserve the 256-byte EEPROM for parameters that must survive power cycles such as calibration and runtime counters.
This page synthesizes distributor pricing, drop-in alternatives within the megaAVR 0-series, and practical design notes not found in the manufacturer datasheet. Prices are quoted as of 2026-10-05.
USD $0.93
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