ATMEGA3208-XU - 8-bit AVR MCU 20MHz 32KB Flash | Microchip
部品番号: ATMEGA3208-XU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 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 概要
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.
ドロップイン代替品: ATMEGA3208-XU — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATMEGA3208-XU （同一形状・フットプリント） — 相違点: Series, Core Processor, Package, RoHS Status, SRAM.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA4808-XU
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ATMEGA1608-XU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$0.58 / 個
データシートを見る →ATMEGA808-XU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$0.68 / 個
データシートを見る →ATMEGA3208-XU 最大定格＆電気的特性
| Core Processor | AVR (8-bit) |
| Core Size | 8-bit |
| 最大クロック周波数 | 20 MHz |
| Flash Memory | 32 KB (16K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Connectivity | I2C, SPI, 3x USART |
| パッケージ / ケース | 28-SSOP |
| 実装スタイル | Surface Mount |
| データバス幅 | 8-bit |
| ADC Resolution | 10-bit |
| Series | megaAVR 0 (ATmega3208) |
| Hardware Multiplier | Yes |
| Functional Safety Support | Yes (FuSa documentation) |
ATMEGA3208-XU 28-ssop ピン配置ガイド
ATMEGA3208-XU (28-ssop パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: ATMEGA3208-XU.
詳細は データシート をご参照ください。
主な用途
ATMEGA3208-XU の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATMEGA3208-XU — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- 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)
設計ノート
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.
コンプライアンス情報
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.
