ATTINY841-MU - 16MHz 8KB AVR MCU | Microchip Technology
部品番号: ATTINY841-MU ✓ 生産中ATTINY841-MU 概要
An 8-bit AVR microcontroller is a compact embedded-control device that combines a processor core, nonvolatile Flash program memory, data memory, and peripherals on one semiconductor die. The ATtiny841 belongs to the TinyAVR family within the broader hierarchy of 8-bit microcontroller, embedded controller, and semiconductor products. It is intended for control-oriented designs where deterministic low-power operation, analog measurement, and a small board footprint are more important than high processing throughput.
Key features include a 16 MHz maximum clock, 8 KB of Flash program storage, 512 bytes of SRAM, 512 bytes of EEPROM, and a 10-bit ADC with 12 channels. Its operating-voltage range of 1.7 V to 5.5 V supports both low-voltage battery-powered equipment and conventional 3.3 V or 5 V systems. The 20-pin QFN-EP package also provides a compact surface-mount footprint and an exposed thermal pad for board-level heat spreading.
The ATtiny841 architecture uses the AVR 8-bit instruction set and provides integrated analog and digital resources for embedded control. The manufacturer documents programmable I/O behavior, tri-state input operation, and alternative peripheral functions including analog-comparator, analog-to-digital converter, and pin-change-interrupt capabilities. Programming and debugging are supported through Microchip’s in-circuit programming and debug ecosystem, including MPLAB Snap connectivity described on the official product page.
Typical applications include compact sensor nodes, industrial control modules, low-power instrumentation, digital control panels, compact power converters, and mixed-signal monitoring equipment. The 12-channel ADC allows multiple analog inputs to share one controller, while 8 KB of Flash accommodates application firmware and configuration logic. For designs near the upper voltage limit, designers must also account for supply tolerance, clock configuration, and component derating.
The exposed pad must be connected according to the manufacturer’s land-pattern and thermal guidance rather than treated as an unused pin. PCB layout should preserve short analog and power paths, provide the required decoupling capacitors, and route high-impedance sensor inputs away from noisy switching nodes. Firmware and pin multiplexing should be checked against the linked ATtiny441/ATtiny841 datasheet before a new PCB is released.
This page consolidates the supplied distributor specifications, official manufacturer links, lifecycle information, packaging data, and qualified drop-in considerations. It also distinguishes verified package-compatible alternatives from broader functional equivalents, helping engineers compare migration options without treating devices with different memory, voltage, or peripheral capabilities as interchangeable.
ドロップイン代替品: ATTINY841-MU — 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。
ATTINY84A-MU
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ATtiny840-MU
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ATTINY841-MU 最大定格＆電気的特性
| Product Type | 8-bit AVR Microcontroller IC |
| Processor Core | AVR 8-bit |
| 最大クロック周波数 | 16 MHz |
| Flash Memory | 8 KB (8K x 8) |
| SRAM | 512 bytes |
| EEPROM | 512 bytes |
| ADC Resolution | 10 bit |
| ADC Channel Count | 12 channels |
| Operating Voltage Range | 1.7 V to 5.5 V |
| 動作温度範囲 | -40°C to +85°C |
| パッケージ | 20-pin QFN with exposed pad (4 mm x 4 mm) |
| 実装タイプ | Surface Mount |
| I/O Port | Multi-port GPIO with alternate peripheral functions |
| Analog Comparator | Supported |
| Pin-Change Interrupt | Supported |
| Debug and Programming | ICSP and in-circuit debugging |
| RoHS ステータス | Compliant |
| ライフサイクル状態 | In Production |
ATTINY841-MU 20-pin qfn with exposed pad (4 mm x 4 mm) ピン配置ガイド
ATTINY841-MU (20-pin qfn with exposed pad (4 mm x 4 mm) 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: ATTINY841-MU.
詳細は データシート をご参照ください。
主な用途
ATTINY841-MU の用途: 6 件s: Compact Sensor Nodes, Industrial Control Modules, Low-Power Instrumentation, Digital Control Panels, Compact Power Converters, Mixed-Signal Monitoring Equipment.
Compact Sensor Nodes
The ATTINY841-MU fits compact sensor nodes because its 12-channel, 10-bit ADC can acquire several analog measurements while the 16 MHz AVR core handles filtering, threshold logic, and communication updates. The 8 KB Flash budget is suitable for focused acquisition and control firmware rather than a large protocol stack. Operate the controller within the verified 1.7 V to 5.5 V range and use the 512-byte SRAM carefully. The 4 mm by 4 mm QFN-EP also reduces board area, although its exposed pad requires the prescribed copper and thermal arrangement.
おすすめ
Industrial Control Modules
The ATTINY841-MU is appropriate for small industrial control modules that combine digital inputs, analog monitoring, and local actuator control. Its 16 MHz operating rate supports responsive event handling, while the 8 KB Flash and 512-byte SRAM fit focused state-machine or supervisory firmware. The verified -40°C to +85°C range is useful across industrial equipment, although the enclosure, power supply, and protection network must handle the actual environment. Because GPIO functions can be remapped to the ADC, comparator, and interrupts, pin allocation must be reviewed before finalizing the PCB.
おすすめ
Low-Power Instrumentation
The ATTINY841-MU suits low-power instrumentation that must combine sensor conditioning, digital calibration, and a compact serial interface. Its 1.7 V minimum operating voltage supports low-voltage supply designs, while the 10-bit, 12-channel ADC provides useful measurement resolution without requiring a large external converter. The 512-byte EEPROM can retain calibration or configuration data, but endurance and write-cycle limits must be considered in the firmware. Sleep-mode and active-current figures were not included in the supplied extract, so battery-life estimates should use the manufacturer electrical characteristics.
おすすめ
Digital Control Panels
The ATTINY841-MU can implement a compact digital control panel for status indication, button input, and analog setpoint adjustment. Its 16 MHz AVR core provides sufficient control bandwidth for debouncing, display updates, and menu or state logic while the 8 KB Flash constrains it to modest firmware. The 20-pin QFN-EP footprint helps preserve board area in tightly packaged human-interface modules. Designers should use spare ADC channels for panel potentiometers only if analog multiplexing, reference accuracy, and acquisition timing satisfy the intended user experience.
おすすめ
Compact Power Converters
The ATTINY841-MU is relevant to compact power-converter supervisory circuits where a microcontroller monitors analog feedback, controls discrete compensation, and coordinates enable sequencing. Its 12-channel ADC offers multiple monitoring points, and its 1.7 V to 5.5 V operating range can support low-side or low-voltage control sections. The 16 MHz clock is adequate for supervisory rather than high-performance digital conversion. Protection functions, startup behavior, and analog accuracy must be verified against the manufacturer data because the supplied extract does not specify operating current, ADC accuracy, or timing margins.
おすすめ
Mixed-Signal Monitoring Equipment
The ATTINY841-MU works well in mixed-signal monitoring equipment that measures several analog channels and applies local limits, filtering, or fault logic. Its 10-bit ADC provides a practical balance between measurement capability, processing demand, and package size, while the AVR architecture simplifies deterministic firmware development. The 8 KB Flash is suitable for compact algorithms and configuration tables, whereas the 512-byte SRAM requires disciplined buffer sizing. Keep high-impedance analog traces short and isolated from digital switching paths, and verify whether 10-bit resolution meets the measurement accuracy required by the end product.
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: ATTINY841-MU — 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 | ATTINY84A-MU | ATtiny840-MU |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | QFN-20-EP (4x4) | QFN-20-EP (4x4) | QFN-20-EP (4x4) |
| Architecture | 8-bit AVR | 8-bit AVR | 8-bit AVR |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz |
| Flash Memory | 8 KB | 8 KB | 8 KB |
| ADC | 10-bit, 12 channels | 10-bit with fewer verified channels | Not verified on the ATTINY841-MU |
| Special Feature | 12-channel ADC | Reduced ADC channel count | No equivalent ADC capability identified |
主な差別化要因
- Higher verified analog input count （vs ATTINY84A-MU)
- Matches the compact 8 KB, 16 MHz AVR performance class （vs ATTINY84A-MU)
- Broader supplied operating-range verification （vs ATtiny840-MU)
- Analog functionality without external converter expansion （vs ATtiny840-MU)
設計ノート
Use the official 4 mm by 4 mm QFN land pattern and connect the exposed pad to the ground plane using the datasheet-prescribed geometry. The EP is not an optional thermal decoration: it is part of the package’s thermal and electrical design. Keep analog inputs away from switching-node copper, preserve short return paths for the ADC, and place decoupling capacitance close to the supply pins. Because the supplied extract does not reproduce the complete pin table, validate every land and route against the official package drawing before fabrication.
Operate the ATTINY841-MU only within its verified 1.7 V to 5.5 V range and check whether the selected clock configuration, ADC use, or peripheral loading imposes tighter limits. Place local decoupling close to the device and route it using a low-impedance path to the power reference. Do not use the ADC readings as an uncalibrated precision reference; account for reference accuracy and noise in the firmware or add an external reference when measurement quality requires it.
Treat a same-package MCU as a drop-in candidate rather than a guaranteed replacement. The ATtiny841’s 12 ADC channels, alternate port functions, interrupt mappings, and peripheral resources must be compared with the proposed alternative. ATtiny84A-MU has a verified 20-pin QFN-EP comparison record but fewer ADC channels, while ATtiny840-MU lacks the ATTINY841-MU’s verified ADC capability. Also avoid treating ATTINY841-MUR as an engineering alternative because it is a reel-ordering variant of the same device.
Plan the PCB around the ATtiny841’s multiplexed GPIO and analog functions. Confirm every assigned pin in the official datasheet, including alternate-function requirements and reset behavior. Keep sensitive analog traces short, provide a quiet analog ground path where appropriate, and avoid routing them beneath or beside high-current switching paths. The package’s small 4 mm by 4 mm footprint supports compact layouts but leaves less room for probe access and rework, so assembly planning should be included during schematic capture.
コンプライアンス情報
The supplied JLCPCB component record identifies ATTINY841-MU as RoHS compliant. No explicit REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statements were supplied.
