ATMEGA3208-AUR - 8-bit AVR MCU 20MHz 32KB Flash | Microchip
Référence : ATMEGA3208-AUR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.42 | $1,42 |
| 10 | $1.28 | $12,80 |
| 100 | $1.12 | $112,00 |
| 500 | $1.02 | $510,00 |
| 1 000 | $0.94 | $940,00 |
ATMEGA3208-AUR Présentation
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals such as timers, communication interfaces, and analog-to-digital converters on one chip. The megaAVR 0-series sits within Microchip's AVR family hierarchy - AVR MCU -> megaAVR -> 0-series - positioned for cost-sensitive embedded control designs that need more performance than classic AVRs without moving to 32-bit cores.
Key features include a 20 MHz maximum clock frequency, 32 KB of self-programmable Flash memory organized as 16K x 16, 4 KB of SRAM for data and stack, and 256 bytes of EEPROM for non-volatile parameter storage. The device operates from a 3.3 V or 5 V supply, easing migration from legacy 5 V systems. The series also carries Functional Safety (FuSa) documentation support, valuable for IEC 61508-style industrial projects.
Technically, the AVR core executes most instructions in a single clock cycle thanks to its Harvard-architecture RISC pipeline, and the integrated hardware multiplier accelerates math-intensive code. The 0-series peripherals - including multi-slice timers, USARTs, SPI, TWI (I2C), and an ADC with internal reference - are controlled through a unified Peripheral Part Access Controller (PPAC-style register map) that is consistent across the family, simplifying code reuse when scaling between 8 KB and 48 KB Flash devices in the same package footprint.
Typical applications include industrial control and automation nodes, home appliances and HVAC boards, and hobby/education platforms - the megaAVR 0-series is supported by the MegaCoreX Arduino hardware package for ATmega3208 and its family members.
Design consideration: choose decoupling capacitors close to each VDD pin on the 7x7 TQFP and verify Brown-Out Reset settings in fuse configuration, since Flash self-programming during runtime requires stable supply margins.
This page synthesizes distributor pricing, drop-in alternatives within the megaAVR 0-series, and practical design notes not consolidated in the manufacturer datasheet. Pricing shown as of 2026-09-17.
Alternatives de remplacement direct pour ATMEGA3208-AUR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA3208-AUR (même facteur de forme et même empreinte) — différant par Core Processor, Series, Peripherals, Packaging, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA3208-AF
✅ Remplacement direct✓ En stock
$1.86 / unité
Voir la fiche technique →ATMEGA3208-AU
✅ Remplacement direct✓ En stock
$1.59 / unité
Voir la fiche technique →ATMEGA3208-AFR
✅ Remplacement direct✓ En stock
$1.62 / unité
Voir la fiche technique →ATMEGA4808-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$1.98 / unité
Voir la fiche technique →ATMEGA1608-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$0.92 / unité
Voir la fiche technique →ATMEGA808-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$1.09 / unité
Voir la fiche technique →ATMEGA3208-AUR Valeurs maximales et caractéristiques électriques
| 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 |
| Tension d'alimentation | 3.3 V / 5 V |
| Boîtier | 32-TQFP (7x7 mm) |
| Type de montage | Surface Mount |
| Series | megaAVR 0-series |
| Functional Safety Support | Yes (FuSa) |
| Nombre de broches | 32 |
| Packaging | Tape & Reel (R suffix) |
Configuration des broches de ATMEGA3208-AUR
| Broche 1 | VDD — Power supply |
| Broche 2 | VDD — Power supply |
| Broche 3 | GND — Ground |
| Broche 4 | GND — Ground |
| Broche 5 | PF0 — Port F bit 0 (ADC input) |
| Broche 6 | PF1 — Port F bit 1 (ADC input) |
| Broche 7 | PF2 — Port F bit 2 (ADC input) |
| Broche 8 | PF3 — Port F bit 3 (ADC input) |
| Broche 9 | GND — Ground |
| Broche 10 | VDDIO2 — Port B independent supply |
| Broche 11 | PB0 — Port B bit 0 |
| Broche 12 | PB1 — Port B bit 1 |
| Broche 13 | PB2 — Port B bit 2 |
| Broche 14 | PB3 — Port B bit 3 |
| Broche 15 | PB4 — Port B bit 4 |
| Broche 16 | PB5 — Port B bit 5 |
| Broche 17 | PC0 — Port C bit 0 |
| Broche 18 | PC1 — Port C bit 1 |
| Broche 19 | PC2 — Port C bit 2 |
| Broche 20 | PC3 — Port C bit 3 |
| Broche 21 | PC4 — Port C bit 4 |
| Broche 22 | PC5 — Port C bit 5 |
| Broche 23 | GND — Ground |
| Broche 24 | VDD — Power supply |
| Broche 25 | PD0 — Port D bit 0 |
| Broche 26 | PD1 — Port D bit 1 |
| Broche 27 | PD2 — Port D bit 2 |
| Broche 28 | PD3 — Port D bit 3 |
| Broche 29 | PD4 — Port D bit 4 |
| Broche 30 | PD5 — Port D bit 5 |
| Broche 31 | PD6 — Port D bit 6 |
| Broche 32 | PD7 — Port D bit 7 / UPDI programming pin (alternate) |
Applications typiques
ATMEGA3208-AUR convient pour 6 applications: Industrial Control and Automation, Home Appliances and HVAC, Hobby, Education, and Arduino-Compatible Boards, Sensor Nodes and IoT Endpoints, Motor Control and Small Drives, Lighting and Smart Home Devices.
Industrial Control and Automation
The ATMEGA3208-AUR fits industrial control nodes because it combines a deterministic 20 MHz AVR RISC core with 32 KB Flash and 4 KB SRAM - enough for Modbus/UART communication stacks, PID loops, and I/O scanning in one low-cost MCU. Its 3.3 V/5 V operation matches legacy 24 V-panel logic translated through standard level shifting, and the megaAVR 0-series Functional Safety documentation supports IEC 61508-oriented development. In a typical sensor node the MCU reads analog inputs via its on-chip ADC, drives relays or PWM outputs through timer slices, and reports over USART or TWI. The hardware multiplier accelerates fixed-point filter math without a 32-bit core cost penalty, and self-programmable Flash enables field firmware updates.
Recommandé
Home Appliances and HVAC
Appliance and HVAC boards benefit from the ATMEGA3208-AUR's blend of cost, robustness, and analog capability. The 32 KB Flash holds user-interface code, sensor compensation tables, and safety routines, while 256 bytes of EEPROM retains calibration and fault logs across power cycles - a key requirement for appliance service diagnostics. The 5 V compatible supply simplifies interface to triacs, relays, and NTC thermistor dividers common in heater and fan control. At 20 MHz with hardware multiplier, the part runs compressor PWM control and button-scanning state machines simultaneously. The 32-pin TQFP (7x7 mm) provides sufficient GPIO for displays, keys, and motor outputs in a footprint that fits typical single-layer-cost appliance PCBs, and Brown-Out Reset protects Flash integrity on noisy mains-derived supplies.
Recommandé
Hobby, Education, and Arduino-Compatible Boards
The megaAVR 0-series is supported by the MegaCoreX Arduino hardware package covering ATmega4809/4808/3209/3208/1609/1608/809/808, making the ATMEGA3208-AUR an attractive core for educational and maker boards. The 20 MHz AVR core executes Arduino sketches efficiently, and 32 KB Flash plus 4 KB SRAM comfortably host sketch code, Serial, SPI, and I2C libraries concurrently - roughly double the SRAM of the classic ATmega328P used in the Uno. The 0-series unified peripheral register map means students migrate between family members with minimal code changes. The 32-pin TQFP is hand-solderable on adapter boards, and MPLAB X plus AVR GCC provide free professional toolchains, lowering the total learning cost for embedded curricula.
Recommandé
Sensor Nodes and IoT Endpoints
For battery-conscious sensor endpoints, the ATMEGA3208-AUR offers the megaAVR 0-series low-power sleep modes together with 4 KB SRAM - sufficient buffers for RF module stacks such as sub-GHz or BLE companion radios driven over UART or SPI. The on-chip ADC with internal reference digitizes temperature, humidity, or current-sense signals without an external converter, and 256 bytes of EEPROM stores device IDs and last-reported values through brown-outs. The 32 KB Flash accommodates a bootloader plus OTA-style update agent alongside application firmware. Its 20 MHz active speed allows burst processing then rapid sleep, and the 32-pin TQFP footprint supports compact two-sided node layouts typical of wireless sensor housings.
Recommandé
Motor Control and Small Drives
Small motor drives - fans, pumps, and DC/stepper controllers - use the ATMEGA3208-AUR's multi-slice timers for complementary PWM generation and the hardware multiplier for speed-loop mathematics at 20 MHz. The 0-series event system routes timer/comparator signals between peripherals without CPU intervention, enabling low-jitter gate patterns for H-bridge drivers. With 32 KB Flash, field-oriented-control or sensorless commutation lookup tables fit alongside communication diagnostics, while 4 KB SRAM holds current-loop state. The 5 V operation directly interfaces gate-driver logic, reducing component count in cost-sensitive drive boards. The 32-pin TQFP provides enough PWM outputs and ADC inputs for three-shunt or single-shunt current sensing in a compact 7x7 mm footprint.
Recommandé
Lighting and Smart Home Devices
Smart lighting and connected-home controllers leverage the ATMEGA3208-AUR for cost-effective local intelligence. The 20 MHz AVR core drives multi-channel LED PWM from timer slices with hardware ease, while 32 KB Flash stores scene tables, dimming curves, and communication protocol handlers (DALI-style UART frames, push-button interfaces). The on-chip ADC reads potentiometer or ambient-light inputs, and EEPROM retains last scene state through power interruptions - essential for luminaire compliance. 3.3 V operation pairs cleanly with wireless modules and capacitive-touch front ends, and the 0-series Functional Safety documentation aids products targeting safety-relevant switching. The 32-pin TQFP (7x7 mm) matches the compact footprints of LED driver boards and wall-control panels.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA3208-AUR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA3208-AF | ATMEGA3208-AU | ATMEGA4808-AUR | ATMEGA1608-AUR | ATMEGA808-AUR |
|---|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB (16K x 16) | 32 KB | 32 KB | 48 KB | 16 KB | 8 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 6 KB | 2 KB | 1 KB |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 128 bytes |
| Packaging | Tape & Reel (R suffix) | Tray | Tube/Tray | Tape & Reel | Tape & Reel | Tape & Reel |
| Pin-to-Pin Compatibility | Reference (TQFP-32) | Identical pinout | Identical pinout | Identical pinout | Identical pinout | Identical pinout |
Principaux différenciateurs
- Balanced 32 KB Flash / 4 KB SRAM mid-point (vs ATMEGA1608-AUR)
- Cost-optimized versus Flash-upgraded sibling (vs ATMEGA4808-AUR)
- Functional Safety documentation support (vs ATMEGA328P (classic megaAVR))
Notes de conception
The ATMEGA3208-AUR operates from a 3.3 V or 5 V supply. Place a 100 nF ceramic decoupling capacitor at each VDD pin (pins 1, 2, 24, and VDDIO2 pin 10) with a solid ground return to pins 3, 4, and 9. If Flash self-programming is used at runtime, maintain supply stability margins and configure Brown-Out Reset appropriately per the datasheet BOD levels, since an unstable rail during self-write can corrupt program memory.
The 32-TQFP (0.8 mm pitch) is easily reflowed but plan a thermal relief ground pour under the device. Keep the UPDI programming pin (shared with PD7) routed to a 3-pin header early in layout - one-wire UPDI needs only a serial resistor from a standard USB-UART bridge or MPLAB SNAP, but retrofitting this trace after tape-out is painful. Keep crystal or internal-oscillator routed lines short and away from PWM/relay drive traces.
Migrating from classic AVRs (e.g., ATmega328P) to the 0-series is not drop-in: the peripheral register map, pinout, and fuse model all differ. Budget firmware time for the register-layer rewrite, and note the 32-pin ATmega3208 does not expose Port A. For Arduino users, the MegaCoreX package (not standard AVR board packages) provides ATmega3208 support. Verify Flash budget against 32 KB before down-selecting to ATMEGA1608.
Informations de conformité
Compliance data was not present in the retrieved web data. Most current Microchip 8-bit MCUs are RoHS-compliant and lead-free, but confirm on the Microchip product page or distributor certificate of conformance before procurement.