ATMEGA3209-AU - 8-bit AVR MCU 32KB 20MHz TQFP-48 | Microchip
N.º de pieza: ATMEGA3209-AU ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.59 | $1,59 |
| 10 | $1.43 | $14,30 |
| 100 | $1.27 | $127,00 |
| 500 | $1.12 | $560,00 |
| 1.000 | $1.02 | $1.020,00 |
| 3.000 | $0.93 | $2.790,00 |
ATMEGA3209-AU Descripción general
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.
Alternativas directas para ATMEGA3209-AU — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATMEGA3209-AU (mismo factor de forma y huella) — difiere en Peripherals, Core Processor, Package, Series, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATMEGA4809-AU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATMEGA3209-AFR
✅ Sustitución directa✓ En stock
$1.71 / unidad
Ver hoja de datos →ATMEGA3209-AUR
✅ Sustitución directa✓ En stock
$1.72 / unidad
Ver hoja de datos →ATMEGA3208-AU
✅ Sustitución directa✓ En stock
$1.59 / unidad
Ver hoja de datos →ATMEGA1609-AU
✅ Sustitución directa✓ En stock
$1.15 / unidad
Ver hoja de datos →ATMEGA4808-AUR
✅ Sustitución directa✓ En stock
$1.98 / unidad
Ver hoja de datos →ATMEGA3209-AU Valores máximos y características eléctricas
| Series | megaAVR 0-series |
| Core Processor | AVR |
| Core Size | 8-bit |
| Frecuencia de reloj máxima | 20 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM (SRAM) | 4 KB |
| EEPROM | 256 B |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| Encapsulado | 48-pin TQFP (7x7 mm) |
| Tipo de montaje | Surface Mount |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, PWM, POR (Power-On Reset) |
| Temperatura de funcionamiento | -40 C to +85 C (industrial) |
| Functional Safety | FuSa (IEC 60730 class B support) |
| Estado RoHS | Compliant |
| Lead Free | Yes |
Configuración de pines de ATMEGA3209-AU
| Pin 1 | VCC — Digital supply voltage |
| Pin 2 | PA0 — Port A bit 0 (GPIO/ADC) |
| Pin 3 | PA1 — Port A bit 1 (GPIO/ADC) |
| Pin 4 | PA2 — Port A bit 2 (GPIO/ADC) |
| Pin 5 | PA3 — Port A bit 3 (GPIO/ADC/REF) |
| Pin 6 | GND — Ground |
| Pin 7 | PA4 — Port A bit 4 (GPIO) |
| Pin 8 | PA5 — Port A bit 5 (GPIO) |
| Pin 9 | PA6 — Port A bit 6 (GPIO) |
| Pin 10 | PA7 — Port A bit 7 (GPIO) |
| Pin 11 | PB0 — Port B bit 0 (GPIO/USART) |
| Pin 12 | PB1 — Port B bit 1 (GPIO/USART) |
| Pin 13 | PB2 — Port B bit 2 (GPIO/SPI) |
| Pin 14 | PB3 — Port B bit 3 (GPIO/SPI) |
| Pin 15 | PB4 — Port B bit 4 (GPIO/SPI) |
| Pin 15 | PB5 — Port B bit 5 (GPIO/SPI/I2C) |
| Pin 16 | GND — Ground |
| Pin 17 | VCC — Digital supply voltage |
| Pin 18 | PC0 — Port C bit 0 (GPIO) |
| Pin 19 | PC1 — Port C bit 1 (GPIO) |
| Pin 20 | PC2 — Port C bit 2 (GPIO/I2C) |
| Pin 21 | PC3 — Port C bit 3 (GPIO/I2C) |
| Pin 22 | PC4 — Port C bit 4 (GPIO) |
| Pin 23 | PC5 — Port C bit 5 (GPIO) |
| Pin 24 | PC6 — Port C bit 6 (GPIO) |
| Pin 25 | PC7 — Port C bit 7 (GPIO) |
| Pin 26 | PD0 — Port D bit 0 (GPIO) |
| Pin 27 | PD1 — Port D bit 1 (GPIO) |
| Pin 28 | PD2 — Port D bit 2 (GPIO) |
| Pin 29 | PD3 — Port D bit 3 (GPIO) |
| Pin 30 | PD4 — Port D bit 4 (GPIO) |
| Pin 31 | PD5 — Port D bit 5 (GPIO) |
| Pin 32 | GND — Ground |
| Pin 33 | VCC — Digital supply voltage |
| Pin 34 | PE0 — Port E bit 0 (GPIO) |
| Pin 35 | PE1 — Port E bit 1 (GPIO) |
| Pin 36 | PE2 — Port E bit 2 (GPIO) |
| Pin 37 | PE3 — Port E bit 3 (GPIO) |
| Pin 38 | PF0 — Port F bit 0 (GPIO/ADC) |
| Pin 39 | PF1 — Port F bit 1 (GPIO/ADC) |
| Pin 40 | PF2 — Port F bit 2 (GPIO/ADC) |
| Pin 41 | PF3 — Port F bit 3 (GPIO/ADC) |
| Pin 42 | PF4 — Port F bit 4 (GPIO/ADC) |
| Pin 43 | PF5 — Port F bit 5 (GPIO/ADC) |
| Pin 44 | RESET — Reset input (active low) |
| Pin 45 | UPDI — Unified Program and Debug Interface |
| Pin 46 | GND — Ground |
| Pin 47 | AVCC — Analog supply voltage |
| Pin 48 | AREF — Analog reference voltage |
Aplicaciones típicas
ATMEGA3209-AU es adecuado para 6 aplicacións: Industrial Control Module, Home Appliance Control, IoT Sensor Node, LED Lighting Controller, Consumer Electronics User Interface, Automotive Body Electronics (Auxiliary).
Industrial Control Module
The ATMEGA3209-AU is an excellent fit for industrial control applications that demand reliability at 8-bit cost. Its 20 MHz AVR core executes deterministic single-cycle instructions while the Core Independent Peripherals (CIPs) and event system offload tasks from the CPU, freeing cycles for application logic. The 32 KB Flash comfortably holds IEC 60730 class B self-test routines plus the main control loop, while the 4 KB SRAM buffers sensor and fieldbus frames. Brown-out detection and power-on reset guarantee safe Flash writes under noisy 24 V industrial rails, and the 1.8-5.5 V supply range accepts common 3.3 V or 5 V regulated rails directly.
Recomendado
Home Appliance Control
The ATMEGA3209-AU is qualified for Functional Safety (FuSa) applications targeting IEC 60730 class B household appliance requirements, per Microchip's megaAVR 0-series FuSa documentation. Its 32 KB Flash holds the application firmware plus the FuSa self-test library, and the brown-out detector plus watchdog timer combine to satisfy the class B diagnostic coverage. The peripheral event system routes signals between timers, ADC, and PWM channels deterministically, ideal for motor speed loops in washing machines, dishwasher pumps, or induction cooktops. The 48-pin TQFP-48 package provides enough GPIO to drive multiple triac/MOSFET outputs plus user-interface buttons and displays.
Recomendado
IoT Sensor Node
The ATMEGA3209-AU is well-matched to battery-powered IoT sensor nodes where deterministic low-power behavior matters most. Its peripheral event system lets a sensor trigger an ADC conversion and DMA transfer without waking the CPU, while sleep currents in the microamp range extend battery life. The 32 KB Flash holds a small TLS/UDP stack plus application logic, and the 4 KB SRAM buffers sensor reads and outgoing frames. Pair it with an external radio module over SPI or UART for a quick wireless node; the 1.8-5.5 V supply range accepts single-cell lithium or 2xAA chemistries directly. The brown-out detector prevents unsafe Flash writes as the battery drains.
Recomendado
LED Lighting Controller
The ATMEGA3209-AU drives multi-channel LED lighting controllers where deterministic PWM and color-mixing accuracy matter most. Its multiple 16-bit timer/counters with PWM outputs handle RGBW channels at 16-bit resolution for smooth color fades, while the event system synchronizes PWM updates to a single timer tick for zero jitter. The 20 MHz core executes color-mixing algorithms in real time, and the 32 KB Flash stores scenes and dimming curves. The 48-pin TQFP-48 package exposes enough PWM-capable pins for up to 16 LED channels plus DMX or DALI interface support over a UART or SPI-connected transceiver.
Recomendado
Consumer Electronics User Interface
The ATMEGA3209-AU is well-suited for consumer electronics user-interface modules where cost and feature integration matter most. Its 32 KB Flash holds capacitive-touch and button-handling firmware, while the 4 KB SRAM buffers display updates and event queues. The I2C/SPI/UART interfaces easily drive small OLED or TFT displays, scan capacitive-touch ICs, and accept commands from a host processor. The 1.8-5.5 V supply range lets the same firmware run on a single-cell Li-ion or 2xAA pack, and the small 48-pin TQFP-48 footprint fits inside handheld remote controls and small appliances.
Recomendado
Automotive Body Electronics (Auxiliary)
The ATMEGA3209-AU can serve auxiliary body-electronics roles in non-safety-critical automotive systems when paired with the automotive-grade variant ATMEGA3209-AFR. Its 32 KB Flash stores body-control logic, 4 KB SRAM buffers CAN/LIN messages via external transceivers, and the 48-pin TQFP-48 footprint fits behind dashboard panels. The AVR core executes single-cycle instructions deterministically, and the peripheral event system handles LIN bus synchronization without fixed-trip CPU overhead. For harsher under-hood or chassis applications, prefer the ATMEGA3209-AFR automotive temperature grade or upgrade to ATMEGA4809-AFR with 48 KB Flash.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA3209-AU — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA4809-AU | ATMEGA3209-AFR | ATMEGA3209-AUR | ATMEGA3208-AU | ATMEGA1609-AU | ATMEGA4808-AU |
|---|---|---|---|---|---|---|---|
| Package | 48-pin TQFP (7x7 mm) | 48-pin TQFP (7x7 mm) - identical | 48-pin TQFP (7x7 mm) - identical | 48-pin TQFP (7x7 mm) - identical | 48-pin TQFP (7x7 mm) - identical | 48-pin TQFP (7x7 mm) - identical | 48-pin TQFP (7x7 mm) - identical |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 48 KB (+50%) | 32 KB (identical) | 32 KB (identical) | 32 KB (identical) | 16 KB (-50%) | 48 KB (+50%) |
| SRAM | 4 KB | 6 KB (+50%) | 4 KB (identical) | 4 KB (identical) | 4 KB (identical) | 2 KB (-50%) | 6 KB (+50%) |
| Maximum Clock Frequency | 20 MHz | 20 MHz (identical) | 20 MHz (identical) | 20 MHz (identical) | 20 MHz (identical) | 20 MHz (identical) | 20 MHz (identical) |
| Core | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Functional Safety (FuSa) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Diferenciadores clave
- Functional Safety (FuSa) IEC 60730 class B support (frente a Classic ATmega328P-AU)
- Event system and Core Independent Peripherals (CIPs) (frente a ATmega328P-AU)
- More Flash and SRAM than ATmega328P (frente a ATmega328P-AU)
Notas de diseño
The ATMEGA3209-AU operates from 1.8 V to 5.5 V supply, but maximum F_CPU scales with VDD per the ATmega3208/3209 datasheet (DS40002174C). Place a 100 nF decoupling capacitor as close as possible to each VCC pin (the 48-pin TQFP exposes 4 VCC/AVCC pins) plus a bulk 10 uF tantalum or ceramic on the supply rail. Use a low-dropout regulator such as MCP1700 for battery-powered designs to minimize quiescent current overhead.
Route the UPDI (Unified Program and Debug Interface) pin as a dedicated single-ended trace to a programming header, keeping it short and away from switching nodes. The RESET pin is internally pulled up but should also have a 10 kohm external pull-up and a 100 nF capacitor for noise immunity. For best ADC accuracy, route AVCC separately from VCC and place a ferrite bead plus decoupling on AVCC per the datasheet reference design.
Brown-out detection (BOD) must be configured before any Flash or EEPROM write - if VDD falls below the BOD threshold during a write, the device may be left in an undefined state. Use the internal 32 kHz ultra-low-power oscillator for sleep-mode timing instead of waking the main 20 MHz oscillator, which dramatically reduces power in duty-cycled designs. Never program the lock bits before verifying Flash contents, as locked devices require a full chip erase to recover.
The peripheral event system lets peripherals signal each other without CPU intervention - for example, a timer overflow can trigger an ADC start automatically. Take advantage of this for deterministic timing: route PWM updates through the event system rather than ISR-driven sequences to avoid jitter. For SPI buses running above 5 MHz, add 22-33 ohm series resistors near the driver pins to dampen ringing, especially with long PCB traces.
Información de cumplimiento
RoHS and lead-free per Microchip product page. Automotive-grade variant ATMEGA3209-AFR is AEC-Q100 qualified; the ATMEGA3209-AU is industrial grade (-40 to +85 C) and is NOT AEC-Q100 qualified.
