ATMEGA3208-XU - 8-bit AVR MCU 20MHz 32KB Flash | Microchip
Référence : ATMEGA3208-XU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.23 | $1,23 |
| 10 | $1.11 | $11,10 |
| 25 | $1.02 | $25,50 |
| 100 | $0.92 | $92,00 |
| 1 000 | $0.84 | $840,00 |
ATMEGA3208-XU Présentation
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and programmable peripherals into one chip, forming the lowest layer of the embedded systems hierarchy: MCU -> embedded processor -> computing system. The megaAVR 0-series is Microchip's latest generation of 8-bit AVR devices, built around a modified Harvard architecture core executing most instructions in a single clock cycle.
Key features of the ATMEGA3208 include its 20 MHz maximum clock frequency, 32 KB (16K x 16) Flash program memory, 4 KB SRAM, and 256 bytes of EEPROM for non-volatile data storage. Connectivity is comprehensive for an 8-bit device: I2C (TWI), SPI, and three USART interfaces. The series introduces Core Independent Peripherals (CIPs), including an Event System that routes signals between peripherals without CPU intervention, plus intelligent analog blocks such as a 10-bit ADC.
From a technical perspective, the AVR core with hardware multiplier delivers efficient 8-bit math performance, and the latest C-compiler-friendly architecture means code written in modern C runs efficiently without hand-tuned assembly. The device also carries Functional Safety (FuSa) documentation support per DigiKey's categorization, easing compliance work in safety-oriented designs. Low-power features across the megaAVR 0-series support sleep modes suitable for battery-conscious applications.
Typical applications include industrial control and automation nodes, consumer appliances, and general-purpose embedded control where a 28-pin footprint, 20 MHz performance, and multiple USARTs are required. The three USART ports make it a strong fit for multi-protocol serial bridging.
A key design consideration: the -XU suffix indicates the 28-lead SSOP package with industrial temperature range; if your board uses a 32-pin TQFP or QFN footprint, select the -AU or -MU variants instead, as packages are not interchangeable without PCB rework.
This page synthesizes distributor pricing, drop-in alternatives within the megaAVR 0-series, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour ATMEGA3208-XU — 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-XU (même facteur de forme et même empreinte) — différant par Series, Core Processor, Package, RoHS Status, SRAM.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA4808-XU
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA1608-XU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$0.58 / unité
Voir la fiche technique →ATMEGA808-XU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$0.68 / unité
Voir la fiche technique →ATMEGA3208-XU Valeurs maximales et caractéristiques électriques
| Core Processor | AVR (8-bit) |
| Core Size | 8-bit |
| Fréquence d'horloge maximale | 20 MHz |
| Flash Memory | 32 KB (16K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Connectivity | I2C, SPI, 3x USART |
| Boîtier / Format | 28-SSOP |
| Style de montage | Surface Mount |
| Largeur du bus de données | 8-bit |
| ADC Resolution | 10-bit |
| Series | megaAVR 0 (ATmega3208) |
| Hardware Multiplier | Yes |
| Functional Safety Support | Yes (FuSa documentation) |
Guide de configuration des broches du ATMEGA3208-XU 28-ssop
Configuration des broches du ATMEGA3208-XU (boîtier 28-ssop). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATMEGA3208-XU.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATMEGA3208-XU convient pour 6 applications: Industrial Control and Automation, Serial Protocol Bridging, Consumer Appliances, Sensor Nodes and IoT Endpoints, Motor Control (Small Loads), Safety-Oriented Embedded Control.
Industrial Control and Automation
The ATMEGA3208-XU fits industrial control nodes that need deterministic 8-bit control with multiple communication ports. Its 20 MHz AVR core with hardware multiplier handles PID and sequencing logic, while 32 KB Flash accommodates control firmware plus a bootloader. The three USARTs allow simultaneous Modbus RTU, a debug console, and an inter-board link; SPI and I2C connect sensors and I/O expanders. Core Independent Peripherals and the Event System let timers and the 10-bit ADC run without CPU intervention, improving loop determinism. DigiKey's Functional Safety (FuSa) categorization means Microchip safety documentation is available for compliance-driven industrial designs, reducing certification effort.
Recommandé
Serial Protocol Bridging
With three USARTs plus SPI and I2C on one 28-pin device, the ATMEGA3208-XU is well suited to protocol converters and gateways - for example translating Modbus RTU on one USART to a proprietary UART link on another while I2C services a configuration EEPROM. The 20 MHz core executes single-cycle instructions with a hardware multiplier, keeping byte-level protocol handling cheap in CPU cycles. 32 KB Flash leaves room for multiple protocol stacks, and 4 KB SRAM supports buffering several frames per port. Using the megaAVR 0-series in the 28-SSOP X package keeps the bridge compact and surface-mountable on dense industrial PCBs.
Recommandé
Consumer Appliances
Home appliances - coffee machines, fans, small pumps, heater controls - typically need one MCU handling a UI, a sensor or two, and a motor or heater drive, all at consumer price points. The ATMEGA3208-XU delivers this at roughly the $1.23 single-unit class (Mouser, as of 2026-09-17). The 10-bit ADC reads NTC thermistors and user potentiometers, Core Independent Peripherals generate PWM for motor or heater control without CPU load, and 256 bytes of EEPROM retain calibration and user settings through power cycles. The 28-SSOP package suits cost-driven two-layer consumer PCBs, and industrial temperature operation adds robustness margin.
Recommandé
Sensor Nodes and IoT Endpoints
The ATMEGA3208-XU serves wired sensor nodes where a radio module handles connectivity and the MCU handles acquisition. Its 10-bit ADC digitizes analog sensors, the Event System routes ADC-complete events to trigger actions without waking heavy code paths, and sleep modes in the megaAVR 0-series keep average current low in duty-cycled designs. SPI connects the node to radio modules or external Flash for local logging, while 32 KB Flash stores acquisition firmware plus a lightweight OTA-style bootloader. The three USARTs allow a debug stream to coexist with the radio link during development, shortening bring-up time considerably.
Recommandé
Motor Control (Small Loads)
For fan, pump, and small DC motor control, the ATMEGA3208-XU pairs Core Independent Peripherals with the 20 MHz AVR core to generate PWM and handle feedback without loading the CPU. Timer outputs drive MOSFET gate drivers or H-bridges, while the 10-bit ADC samples current shunts and back-EMF for closed-loop speed regulation. The hardware multiplier accelerates the fixed-point math in PI loops at 20 MHz. 32 KB Flash accommodates the control loop plus fault handling and a communication port for speed commands over USART, making the part a compact single-chip motor controller in the 28-SSOP footprint.
Recommandé
Safety-Oriented Embedded Control
DigiKey classifies the ATMEGA3208-XU under Functional Safety (FuSa) microcontrollers, reflecting Microchip's safety documentation support for the megaAVR 0-series. For applications that must document development per functional-safety processes, using a part whose manufacturer provides safety manuals, FMEDA-style data, and verification collateral reduces compliance workload. Technically, the Core Independent Peripherals support watchdog and diagnostic patterns, three USARTs enable redundant communication channels, and the deterministic single-cycle AVR core simplifies timing analysis. The 32 KB Flash / 4 KB SRAM budget is adequate for safety logic plus diagnostics in non-automotive, lower-SIL embedded control applications.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA3208-XU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA4808-XU | ATMEGA1608-XU | ATMEGA808-XU |
|---|---|---|---|---|
| Package | 28-SSOP (X) | 28-SSOP - same footprint | 28-SSOP - same footprint | 28-SSOP - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB (16K x 16) | 48 KB | 16 KB | 8 KB |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| SRAM | 4 KB | 6 KB | 2 KB | 1 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 128 bytes |
| Connectivity | I2C, SPI, 3x USART | I2C, SPI, 3x USART | I2C, SPI, 3x USART | I2C, SPI, USART |
| Series / Core | megaAVR 0, 8-bit AVR | megaAVR 0, 8-bit AVR | megaAVR 0, 8-bit AVR | megaAVR 0, 8-bit AVR |
Principaux différenciateurs
- Balanced 32 KB Flash at the family price floor (vs ATMEGA4808-XU)
- Twice the program memory of the entry sibling (vs ATMEGA1608-XU)
- Three USARTs for multi-protocol designs (vs ATMEGA808-XU)
Notes de conception
Package selection is the most common ordering mistake on this family: the -XU suffix is the 28-lead SSOP, while -AU (TQFP-32) and -MU (QFN-32) variants of the ATmega3208 use 32-pin packages with different footprints. The ATMEGA3208-XU cannot be substituted onto a 32-pin PCB without rework. Before ordering, confirm the landing pattern matches the 28-SSOP outline, and cross-check the -XU industrial temperature suffix against your environmental requirements.
The exact supply voltage limits are not included in the retrieved listing data; download the official ATmega3208/3209 datasheet from Microchip's product page and apply the speed-versus-voltage derating curve before fixing your regulator. As a design pattern, decouple each VDD pin with 100 nF ceramics placed within a few millimeters of the pins, plus bulk capacitance at the board level. Verify that your 20 MHz operation point is valid at your minimum supply voltage, not just the nominal value.
Use the UPDI (Unified Program and Debug Interface) single-pin programming of the megaAVR 0-series: reserve the UPDI pin with a series resistor and a 2x3 test-point header rather than a full JTAG-style connector, saving board area on the 28-SSOP layout. Keep the three USART routing pairs short and, for the RS-485/Modbus USART, place the transceiver close to the pin. MegaCoreX (Arduino) support lets you prototype on a breakout before committing to the production footprint.
Informations de conformité
Compliance status was not stated in the retrieved distributor data. Microchip standard parts are typically RoHS-compliant, but confirm on the official ATMEGA3208 product page or the distributor compliance certificate before release.
