ATMEGA3209-MF - 8-Bit AVR MCU 20MHz 32KB QFN-48 | Microchip
MPN: ATMEGA3209-MF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.68 | $0.68 |
| 10 | $0.65 | $6.50 |
| 100 | $0.61 | $61.00 |
| 500 | $0.58 | $290.00 |
| 1,000 | $0.55 | $550.00 |
ATMEGA3209-MF Overview
An 8-bit microcontroller is a single-chip computing device whose CPU processes data in 8-bit words, combining a processor core, program memory (Flash), data memory (SRAM/EEPROM) and peripherals on one die. Within the system hierarchy, it belongs to the embedded MCU class of the megaAVR 0 series, positioned between small 8-bit MCUs like the tinyAVR family and larger 32-bit ARM-based MCUs. The megaAVR 0 series uses the latest AVR Core Independent Peripherals, letting timers, ADC and communication blocks run without CPU intervention.
Key features of the ATMEGA3209-MF include the 20 MHz AVR processor with a hardware multiplier for fast arithmetic, 32 KB Flash for application code, and the Functional Safety (FuSa) qualification that supports IEC 61508-class designs. Multiple USARTs, an SPI and an I2C peripheral, plus a 10-bit ADC and event system, make it suitable for compact, code-dense embedded control.
Technically, the AVR RISC core executes most instructions in a single clock cycle, so the 20 MHz clock delivers high effective throughput for an 8-bit architecture. The hardware multiplier accelerates signal processing and control loops, while Core Independent Peripherals offload timing and analog tasks from the CPU, reducing interrupt latency and power consumption.
Typical applications include industrial automation and control nodes, embedded systems requiring functional-safety documentation, consumer appliances, and sensing/IoT endpoints that need rich connectivity in a small 7x7 mm QFN-48 footprint. Community firmware support such as MegaCoreX Arduino support for the ATmega3209 further speeds prototyping.
Design consideration: verify the exact supply-voltage range and temperature grade on the official datasheet before finalizing the power budget, and reserve the UPDI programming pin access on your PCB for one-wire debug and Flash programming.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing references are as of 2026-09-17, with entry-level pricing from LCSC from $0.6775.
Drop-in alternatives for ATMEGA3209-MF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA3209-MF (same form factor and footprint) — differing in Core Processor, Package, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA4809-MF
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.85 / Unit
View Datasheet →ATMEGA1609-MFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.25 / Unit
View Datasheet →ATMEGA809-MF
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.75 / Unit
View Datasheet →ATMEGA3209-MF Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory Size | 32 KB (16K x 16) |
| SRAM Size | 4 KB |
| EEPROM Size | 256 bytes |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset |
| Series | megaAVR 0 (Functional Safety, FuSa) |
| Number of Pins | 48 |
| Package | 48-QFN (7x7 mm) |
| Mounting Type | Surface Mount |
| Programming Interface | UPDI (Unified Program Debug Interface) |
| Product Status | Active |
| RoHS Status | Compliant |
ATMEGA3209-MF 48-qfn (7x7 mm) Pin Configuration Guide
Pin configuration for ATMEGA3209-MF (48-qfn (7x7 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA3209-MF.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA3209-MF is suitable for 6 applications: Industrial Automation Control Nodes, Functional Safety Embedded Systems, Consumer Appliances, IoT Sensor Endpoints, Motor Control and Power Tool Electronics, Embedded Education and Prototyping.
Industrial Automation Control Nodes
The ATMEGA3209-MF fits industrial automation nodes because its 20 MHz AVR core with hardware multiplier executes PID-style control loops efficiently, while the Core Independent Peripherals let timers and the event system run PWM sequencing and sensor sampling without CPU intervention. Its Functional Safety (FuSa) designation from the megaAVR 0 family supports safety-relevant industrial designs that need documented failure-mode analysis. In a typical node, the MCU drives actuators through PWM outputs, reads analog sensors via the ADC, and reports over a UART/RS-485 link; the 32 KB Flash holds protocol stacks with margin. Brown-out detect and reset peripherals guard against unreliable rail conditions common on factory floors.
Recommended
Functional Safety Embedded Systems
For embedded systems targeting functional-safety development flows, the ATMEGA3209-MF is explicitly designated a Functional Safety (FuSa) part by Microchip, meaning the manufacturer supplies supporting safety collateral for the megaAVR 0 family. The deterministic single-cycle AVR core simplifies worst-case execution time analysis at 20 MHz, an important property for safety-related control logic. Designers typically implement input plausibility checks in firmware, use the brown-out detector for supply supervision, and reserve the UPDI interface for traceable firmware updates. The 32 KB Flash accommodates application code plus diagnostic routines, while the 4 KB SRAM handles redundant data structures required by safety concepts in industrial machinery and process control.
Recommended
Consumer Appliances
Consumer appliance control boards benefit from the ATMEGA3209-MF's balance of cost and integration: pricing from roughly $0.68 per unit (LCSC, as of 2026-09-17) makes it competitive for high-volume products, while the 48-pin QFN (7x7 mm) footprint keeps two-layer PCBs compact. The I2C and UART/USART peripherals connect touch controllers and displays, and the 10-bit ADC (family peripheral) reads temperature probes and user controls. Core Independent Peripherals allow button debouncing and display multiplexing in hardware, reducing firmware complexity. Because community MegaCoreX Arduino support exists for the ATmega3209, appliance makers can prototype control logic rapidly before committing to production firmware.
Recommended
IoT Sensor Endpoints
The ATMEGA3209-MF serves as the processing core of wired IoT sensor endpoints, where the I2C and SPI interfaces connect environmental or motion sensors and the UART streams data to a radio module or gateway. Its hardware multiplier accelerates sensor compensation math (such as thermistor linearization) at the 20 MHz clock, and the event system permits periodic ADC sampling controlled entirely by a timer, minimizing wake latency. The 32 KB Flash stores sensor drivers plus a compact application protocol, and 256 bytes of EEPROM retains calibration constants across power cycles. Active product status and multi-distributor availability (8 sources on Octopart) reduce long-term supply risk for deployed fleets.
Recommended
Motor Control and Power Tool Electronics
Entry-level motor control and power-tool electronics use the ATMEGA3209-MF because the hardware multiplier supports fast duty-cycle recalculation, and family timers generate complementary PWM with dead-time control through Core Independent Peripherals. The brown-out detect/reset peripheral protects gate-drive logic during battery sag events common in cordless tools. Firmware for commutation tables and protection state machines fits within 32 KB Flash with room for bootloader-based field updates. The 7x7 mm 48-QFN package with exposed thermal characteristics suits compact driver PCBs, and the 20 MHz clock provides sufficient loop rate for brushed and low-speed brushless motor control where full DSP-class MCUs would be cost-prohibitive.
Recommended
Embedded Education and Prototyping
The ATMEGA3209-MF is popular in education and prototyping because the entire megaAVR 0 family is supported by MCUdude's MegaCoreX Arduino hardware package, giving the ATmega3209 a modern toolchain with Core Independent Peripheral libraries. Hobbyists and labs use it for learning 8-bit embedded C, peripheral configuration, and UPDI-based programming with low-cost tools. The 32 KB Flash provides generous room for student projects combining UART, I2C and SPI peripherals, and the same-footprint family (4809/3209/1609/809) lets learners upgrade or downgrade memory without changing hardware. DigiKey and LCSC stock the part, with pricing around $0.68 per unit as of 2026-09-17, keeping prototype budgets small.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA3209-MF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA4809-MF | ATMEGA1609-MF | ATMEGA809-MF | ATMEGA3209-AFR |
|---|---|---|---|---|---|
| Package | 48-QFN (7x7 mm) | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | TQFP-48 (different footprint) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Speed | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz |
| Flash Memory | 32 KB | 64 KB | 16 KB | 8 KB | 32 KB |
| SRAM | 4 KB | 6 KB | 2 KB | 1 KB | 4 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 128 bytes | 256 bytes |
| Connectivity | I2C, SPI, UART/USART | I2C, SPI, UART/USART | I2C, SPI, UART/USART | I2C, SPI, UART/USART | I2C, SPI, UART/USART |
Key Differentiators
- Functional Safety (FuSa) designation (vs ATMEGA3209-AFR)
- Compact 7x7 mm 48-QFN footprint with full port set (vs ATMEGA3209-AFR)
- Best price/performance in the 48-pin QFN family (vs ATMEGA4809-MF)
Design Notes
The 48-QFN (7x7 mm) package requires an exposed pad or well-defined ground plane beneath the die. Connect the center pad (if present on the footprint) to a solid ground pour with an array of thermal vias, and place 100 nF decoupling capacitors within 2 mm of each VDD pin. The UPDI single-wire programming interface must remain accessible - add a 3-pin header (UPDI, VDD, GND) during layout so post-assembly programming is possible without fixture rework.
Verify the supply-voltage range and current budget against the official ATmega3208/3209 datasheet before finalizing the power tree; the exact operating range is marked as data-needed on this page. Use local bulk capacitance (4.7-10 uF) plus per-pin 100 nF ceramics, and rely on the internal brown-out detect/reset peripheral as a low-cost supply supervisor. Estimated: for mostly-digital I/O activity at 20 MHz, MCU current draw is typically in the milliamp range, so LDO dropout and rail sequencing are rarely limiting factors.
When substituting family members (ATMEGA4809-MF, ATMEGA1609-MF, ATMEGA809-MF), memory sizes and EEPROM sizes differ - the ATmega809 has only 8 KB Flash and 128 bytes EEPROM, which can silently truncate large firmware images. Confirm peripheral instance counts per package on the datasheet before assuming identical code runs across variants. Also note that some ATMEGA3209 suffixes (e.g., -AFR) are TQFP, not QFN; ordering errors between MF and AFR suffixes are a frequent sourcing mistake.
Compliance Information
RoHS compliance indicated by distributor listing of a modern active Microchip MCU; detailed REACH/lead-free/halogen status should be confirmed on the official Microchip product page environmental data sheet.
