ATMEGA3208-AF - 8-bit AVR MCU 32KB 20MHz TQFP-32 | Microchip
N.º de pieza: ATMEGA3208-AF ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.9 | $2,90 |
| 10 | $2.61 | $26,10 |
| 100 | $2.32 | $232,00 |
| 500 | $2.08 | $1.040,00 |
| 1.000 | $1.86 | $1.860,00 |
ATMEGA3208-AF Descripción general
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, forming the lowest tier of the embedded computing hierarchy: MCU -> embedded processor -> system-on-chip -> full computer system. The megaAVR 0-series sits within the AVR family of 8-bit RISC architectures originally developed by Atmel and now manufactured by Microchip Technology.
Key features of the ATMEGA3208-AF include a 20 MHz maximum clock frequency, 32 KB in-system self-programmable Flash with the latest AVR instruction set, and an extended feature set that includes event system, configurable custom logic (CCL), and 12-bit ADC peripherals typical of the megaAVR 0-series. The AF suffix denotes the TQFP-32 package option with FuSa qualification support, targeting safety-oriented industrial designs.
Technically, the AVR core executes most instructions in a single clock cycle and includes a hardware multiplier, delivering efficient arithmetic throughput for 8-bit applications. Memory organization provides 16K x 16 words of Flash for code, 4 KB of SRAM for variables, and 256 bytes of EEPROM for non-volatile calibration data.
Typical applications include industrial control and automation, functional-safety-oriented monitoring systems, consumer appliances, and motor control or sensing nodes where 20 MHz 8-bit performance with 32 KB program memory is sufficient.
Design consideration: the core may run at reduced clock speeds at the low end of the supply voltage range (around 2.7 V at 8 MHz per distributor data), so verify clock-versus-voltage margins before finalizing the power architecture.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Alternativas directas para ATMEGA3208-AF — 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 ATMEGA3208-AF (mismo factor de forma y huella) — difiere en Core Processor, Peripherals, Package, SRAM, Flash Memory.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATMEGA3208-AU
✅ Sustitución directa✓ En stock
$1.59 / unidad
Ver hoja de datos →ATMEGA4808-AU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATMEGA1608-AU
✅ Sustitución directa✓ En stock
$0.86 / unidad
Ver hoja de datos →ATMEGA808-AU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATMEGA3208-AF Valores máximos y características eléctricas
| Core Processor | AVR (8-bit RISC) with hardware multiplier |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Flash Memory | 32 KB (16K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Series | megaAVR 0-series |
| Functional Safety | FuSa supported |
| Encapsulado | 32-TQFP (7 x 7 mm) |
| Tipo de montaje | Surface Mount |
| Low-Voltage Clock Limit | 8 MHz at 2.7 V minimum supply (per distributor data) |
| Peripherals | Event System, CCL (configurable custom logic), ADC, timers, USART, SPI, I2C |
| Programming Interface | UPDI (Unified Program and Debug Interface) |
| Estado RoHS | Compliant |
Configuración de pines de ATMEGA3208-AF
| Pin 1 | PB5 — Port B bit 5, multifunction GPIO/analog |
| Pin 2 | PB4 — Port B bit 4, multifunction GPIO/analog |
| Pin 3 | PB3 — Port B bit 3, multifunction GPIO/analog |
| Pin 4 | PB2 — Port B bit 2, multifunction GPIO/analog |
| Pin 5 | PB1 — Port B bit 1, multifunction GPIO/analog |
| Pin 6 | PB0 — Port B bit 0, multifunction GPIO/analog |
| Pin 7 | VDD — Power supply |
| Pin 8 | GND — Ground |
| Pin 9 | PD7 — Port D bit 7, multifunction GPIO |
| Pin 10 | PD6 — Port D bit 6, multifunction GPIO |
| Pin 11 | PD5 — Port D bit 5, multifunction GPIO |
| Pin 12 | PD4 — Port D bit 4, multifunction GPIO |
| Pin 13 | PA0 — Port A bit 0, UPDI programming/debug pin |
| Pin 14 | PA1 — Port A bit 1, multifunction GPIO/analog |
| Pin 15 | PA2 — Port A bit 2, multifunction GPIO/analog |
| Pin 16 | PA3 — Port A bit 3, multifunction GPIO/analog |
| Pin 17 | PA4 — Port A bit 4, multifunction GPIO/analog |
| Pin 18 | PA5 — Port A bit 5, multifunction GPIO/analog |
| Pin 19 | PA6 — Port A bit 6, multifunction GPIO/analog |
| Pin 20 | PA7 — Port A bit 7, multifunction GPIO/analog |
| Pin 21 | PC7 — Port C bit 7, multifunction GPIO |
| Pin 22 | PC6 — Port C bit 6, multifunction GPIO |
| Pin 23 | PC5 — Port C bit 5, multifunction GPIO |
| Pin 24 | PC4 — Port C bit 4, multifunction GPIO |
| Pin 25 | PC3 — Port C bit 3, multifunction GPIO |
| Pin 26 | PC2 — Port C bit 2, multifunction GPIO |
| Pin 27 | PC1 — Port C bit 1, multifunction GPIO |
| Pin 28 | PC0 — Port C bit 0, multifunction GPIO |
| Pin 29 | PB7 — Port B bit 7, multifunction GPIO |
| Pin 30 | PB6 — Port B bit 6, multifunction GPIO |
| Pin 31 | PF7 — Port F bit 7, multifunction GPIO/analog |
| Pin 32 | PF6 — Port F bit 6, multifunction GPIO/analog |
Aplicaciones típicas
ATMEGA3208-AF es adecuado para 6 aplicacións: Industrial Control and Automation, Functional-Safety-Oriented Monitoring Systems, Motor Control and Actuation, IoT Sensor Nodes, Consumer Appliances, Test, Measurement and Hobby Development.
Industrial Control and Automation
The ATMEGA3208-AF fits industrial control nodes where its 20 MHz AVR core with hardware multiplier handles control-loop arithmetic and 32 KB Flash accommodates protocol and diagnostic code. The megaAVR 0-series event system routes peripheral signals without CPU intervention, and the FuSa support of the AF variant aids safety-documented machinery controllers. In a typical PLC expansion or sensor-hub board, the MCU runs a deterministic polling loop with USART and I2C links to drives and sensors, while configurable custom logic (CCL) offloads simple gating tasks, reducing interrupt latency versus software-only approaches.
Recomendado
Functional-Safety-Oriented Monitoring Systems
The AF suffix of the ATMEGA3208-AF denotes Functional Safety (FuSa) support, making it appropriate for safety-documented monitoring equipment such as over-temperature supervision, interlock sensing, and equipment-health loggers. The 32 KB Flash stores both the control firmware and diagnostic routines, while 256 bytes of EEPROM retains fault counters and calibration constants across power cycles. Designers typically add redundant sensing paths into the 12-bit ADC class peripherals and use the event system for fast fault propagation, documenting the safety case with the FuSa package support rather than requalifying a standard commercial variant.
Recomendado
Motor Control and Actuation
With a hardware multiplier in the AVR core, the ATMEGA3208-AF executes the fixed-point arithmetic needed for PWM-based motor control at 20 MHz. The megaAVR 0-series timers generate complementary PWM outputs, and the event system synchronizes ADC sampling to PWM edges for current measurement without CPU jitter. In small DC or stepper drive boards, the MCU closes a current/speed loop every PWM period while the CCL implements dead-time gating in hardware. 32 KB Flash is sufficient for field-oriented or sensorless commutation code tables, and UPDI simplifies firmware updates in the field.
Recomendado
IoT Sensor Nodes
The ATMEGA3208-AF serves battery-powered and mains-powered IoT sensor endpoints where an 8-bit MCU provides adequate compute at low cost. Its 32 KB Flash hosts compact networking stacks over USART/SPI-connected radios, and 4 KB SRAM handles buffering and light protocol state. The megaAVR 0-series sleep modes and peripheral event routing allow the CPU to remain idle while peripherals gather data, conserving energy between transmissions. In a typical node, sensors connect via I2C and the MCU forwards measurements through a wireless module, with EEPROM storing device identity and last-known-good calibration.
Recomendado
Consumer Appliances
Home appliances such as coffee machines, fans, and small cooktops use the ATMEGA3208-AF for user-interface scanning, relay/triac control, and safety supervision. The 20 MHz core responds within microsecond timescales to button events, while 32 KB Flash leaves room for localized menus, multi-language strings, and self-test code. Capacitive-touch or encoder inputs map onto the GPIO banks of the TQFP-32 package, and the configurable custom logic debounces inputs in hardware. The FuSa support of the AF variant is additionally useful for appliance functions that require documented safety behavior such as overheat cutoff.
Recomendado
Test, Measurement and Hobby Development
The ATMEGA3208-AF is widely used in bench instruments, data loggers, and hobby platforms thanks to toolchain breadth: Microchip MPLAB X, PICkit 4 / SNAP programmers via UPDI, and the open-source MegaCoreX Arduino package on GitHub that explicitly supports ATmega3208. The hardware multiplier accelerates FFT and filtering math in low-cost measurement firmware, while the 12-bit ADC class peripherals digitize sensor inputs. 32 KB Flash supports substantial display menus and logging, and the TQFP-32 7 x 7 mm footprint fits standard 0.5 mm-pitch hobby breakout boards and educational training kits.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA3208-AF — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA3208-AU | ATMEGA4808-AU | ATMEGA1608-AU | ATMEGA808-AU |
|---|---|---|---|---|---|
| Package | 32-TQFP (7 x 7 mm) | 32-TQFP (7 x 7 mm) - same | 32-TQFP (7 x 7 mm) - same | 32-TQFP (7 x 7 mm) - same | 32-TQFP (7 x 7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB (16K x 16) | 32 KB (16K x 16) | 48 KB (24K x 16) | 16 KB (8K x 16) | 8 KB (4K x 16) |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Programming Interface | UPDI | UPDI | UPDI | UPDI | UPDI |
| Pin Compatibility | megaAVR 0-series TQFP-32 pinout | Pin-to-pin identical | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible |
Diferenciadores clave
- Functional Safety (FuSa) support on the AF variant (frente a ATMEGA3208-AU)
- Balance of memory and pin count in the family (frente a ATMEGA4808-AU)
- Hardware multiplier at 20 MHz (frente a ATMEGA808-AU)
Notas de diseño
Distributor data indicates the ATMEGA3208-AF can operate from a 2.7 V minimum supply only at reduced clock speed (around 8 MHz), so verify the voltage-versus-frequency derating curve in the ATmega3208/3209 datasheet (DS40002174C) before choosing the rail. For 20 MHz operation, budget the higher end of the supply range. Add 100 nF ceramic decoupling on each VDD pin as close to the package as possible, plus bulk 10 uF near the regulator, per Microchip megaAVR 0-series hardware design guidance.
The 32-TQFP 7 x 7 mm body uses 0.8 mm pin pitch and requires a standard TQFP-32 land pattern per the package outline drawing in DS40002174C. Keep the UPDI trace (PA0, pin 13) short and route it to a 3-pad programming header (UPDI, VDD, GND) so production programming does not require board removal. Avoid running fast switching traces under the crystal or analog port pins; use a solid ground plane on layer 2 for lowest-noise ADC results.
The megaAVR 0-series has no dedicated RESET-dedicated pin in default configuration; the reset function is multiplexed and configured via fuses - new designs frequently misconfigure this when migrating from classic AVR parts like ATmega328P. Also, the AF (FuSa) variant exists specifically for safety-documented designs: if your project does not require functional-safety documentation, the standard ATMEGA3208-AU is typically easier to source and equivalent electrically. Finally, EEPROM endurance budgets must be respected; reserve the 256 bytes for wear-leveled writes.
Información de cumplimiento
RoHS compliant per Microchip product/distributor listings. Obtain official Microchip material declarations for REACH, halogen-free, and conflict-minerals status. FuSa (functional safety) support indicated by AF suffix.