ATTINY43U-MU - 8MHz 4KB AVR MCU | Microchip Technology
料号： ATTINY43U-MU ✓ 量产中ATTINY43U-MU 概述
An 8-bit microcontroller is a compact embedded-control processor that executes firmware to monitor inputs, control outputs, and manage system timing. The ATTINY43U belongs to the AVR family of RISC-based embedded processors, with the ATtiny43U positioned as a low-power, low-pin-count device for compact control systems. Its resource mix of Flash program memory, EEPROM, and SRAM supports small control loops, parameter storage, and modest working-data requirements.
Key features include 4 KB of Flash program memory, 64 B of EEPROM, 256 B of SRAM, and 16 general-purpose I/O lines. Two 8-bit timer/counters provide two PWM channels for timing and basic proportional-control functions. The manufacturer describes an advanced RISC architecture with 120 instructions, most of which execute in a single clock cycle, supporting an execution rate approaching 1 MIPS per MHz.
The ATTINY43U uses the AVR8 architecture and is designed for low-voltage, low-power embedded control. Its 20-QFN-EP package provides 16 I/O capabilities while minimizing PCB area. The exposed-pad package designation supports compact surface-mount construction, although final thermal performance depends on the PCB copper and power dissipation of the selected operating mode.
Typical applications include compact sensor interfaces, simple motor and actuator controllers, low-power condition-monitoring modules, industrial control tiles, and battery-operated equipment. In each case, the 8 MHz AVR core and small memory footprint are suitable for local control functions where a higher-performance MCU, larger memory system, or more complex package would add unnecessary cost or space.
Designers should verify the complete electrical limits, ADC behavior, clock options, pin multiplexing, and exposed-pad connection directly against the manufacturer datasheet before layout. Because the 16 I/O lines share pins with specialized functions, peripheral assignments must be checked against the required application and board-level routing.
This page consolidates verified manufacturer and distributor information for the ATTINY43U-MU, including memory characteristics, package details, sourcing links, application guidance, and documented gaps where complete electrical data was not present in the supplied search results.
直接替换替代料： ATTINY43U-MU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料ATTINY43U-MU 最大额定值与电气特性
| Product Type | 8-bit RISC microcontroller |
| CPU Core | AVR8 |
| Architecture | Enhanced RISC |
| 数据总线宽度 | 8 bit |
| 最大时钟频率 | 8 MHz |
| Flash Memory | 4 KB (2K x 16) |
| EEPROM | 64 B |
| SRAM | 256 B |
| General-Purpose I/O Lines | 16 |
| General-Purpose Working Registers | 32 |
| Timer/Counters | 2 x 8-bit |
| PWM Channels | 2 |
| Instruction Set | 120 instructions |
| Lowest Stated Supply Voltage | 0.9 V |
| 封装 | 20-QFN-EP (4 x 4 mm) |
| 安装类型 | Surface mount |
| Process Technology | Low-power CMOS |
ATTINY43U-MU 20-qfn-ep (4 x 4 mm) 引脚配置指南
ATTINY43U-MU（20-qfn-ep (4 x 4 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATTINY43U-MU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATTINY43U-MU 适用于 6 应用s: Compact Sensor Interface, Battery-Powered Condition Monitoring, Small Motor and Actuator Control, LED Dimming and Lighting Control, Industrial Control Tile, Low-Power Household Accessory.
Compact Sensor Interface
The ATTINY43U-MU fits compact sensor interfaces because its 8 MHz AVR8 core can execute control and signal-conditioning firmware while the device provides 4 KB Flash, 64 B EEPROM, and 256 B SRAM. The 256 B SRAM is suitable for short acquisition buffers and working variables, while EEPROM can retain calibration or configuration values between power cycles. Its 20-QFN-EP 4 x 4 mm package helps minimize board area in distributed sensing modules. Designers should allocate the 16 I/O lines against sensor inputs, communications, and any ADC requirements, and confirm peripheral multiplexing and the exposed-pad layout in doc8048.
推荐
Battery-Powered Condition Monitoring
The ATTINY43U-MU is appropriate for battery-powered condition monitoring because the manufacturer classifies it as an ultra-low-voltage AVR microcontroller and the verified listing identifies a 0.9 V operating level. Its 4 KB Flash can hold event detection and logging logic, while 64 B of EEPROM preserves small configuration records without occupying RAM. The two 8-bit timer/counters support periodic wake-up, sampling, and timeout functions, and the 20-QFN-EP package reduces physical footprint. Final battery-life calculations must use the verified operating-current and sleep-mode figures from the manufacturer datasheet rather than generic AVR estimates.
推荐
Small Motor and Actuator Control
The ATTINY43U-MU can serve as the local controller in a small motor or actuator system because it includes two 8-bit timer/counters with two PWM channels and an 8 MHz AVR core. Those channels can generate the timing signals required for basic proportional control, while 16 general-purpose I/O lines accommodate position inputs, limit switches, and driver-control outputs. The 4 KB Flash and 256 B SRAM are adequate for compact control loops rather than complex motion algorithms. Engineers should account for driver transistors, protection circuitry, inductive transients, and the controller's pin multiplexing when laying out the board.
推荐
LED Dimming and Lighting Control
ATTINY43U-MU is suitable for simple LED dimming and lighting-control modules because its two timer/counters provide two PWM channels and its 8 MHz core supports responsive duty-cycle and fade algorithms. Sixteen I/O lines leave room for button inputs, status indicators, and an external driver interface, while 4 KB Flash accommodates a compact user-interface state machine. The small 20-QFN-EP package also fits inline lighting modules and space-constrained control boards. For multi-channel or high-current lighting, the MCU should drive external transistor or LED-driver circuitry rather than load the I/O pins directly.
推荐
Industrial Control Tile
The ATTINY43U-MU can support a compact industrial control tile that reads discrete inputs, operates timing functions, and coordinates local outputs. Its 16 general-purpose I/O lines provide a practical interface capacity for sensors, interlocks, and status signals, while the two 8-bit timer/counters with two PWM channels support repetitive machine-control tasks. The 8 MHz AVR core offers sufficient throughput for deterministic logic that does not require networking or high-bandwidth computation. Industrial qualification, isolation, surge protection, and extended-temperature requirements must be evaluated separately from the general electrical specifications in doc8048.
推荐
Low-Power Household Accessory
ATTINY43U-MU fits small household accessories that need local button handling, status indication, and low-power operation. Its 16 I/O lines can support user inputs, alarm outputs, and an external communications device, while the 4 KB Flash and 256 B SRAM suit compact state-machine firmware. The 20-QFN-EP package helps reduce product size, and the ultra-low-voltage architecture is useful in designs powered by small energy sources or low-voltage batteries. Engineering validation should cover standby current, wake-up timing, ESD requirements, and the electrical limits for every externally accessible signal.
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推荐产品汇总
工程参考数据： ATTINY43U-MU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Package | 20-QFN-EP (4 x 4 mm) |
| Brand | Microchip Technology |
| CPU Core | AVR8 |
| Data Bus Width | 8 bit |
| Maximum Clock Frequency | 8 MHz |
| Flash Memory | 4 KB (2K x 16) |
| EEPROM | 64 B |
| SRAM | 256 B |
| General-Purpose I/O Lines | 16 |
| Timer/Counters | 2 x 8-bit |
| PWM Channels | 2 |
| Lowest Stated Supply Voltage | 0.9 V |
设计说明
Treat the exposed pad as a functional board requirement rather than an optional thermal feature. Consult doc8048 for the permitted pad connection and land pattern, then provide a continuous ground or specified pad structure directly beneath the QFN. Keep the package footprint within the manufacturer's assembly guidelines because a copied 20-QFN land pattern may not match the exposed-pad geometry exactly.
Verify the complete operating-voltage range before selecting decoupling and external interface levels. The verified data establishes a 0.9 V operating level but does not provide maximum voltage, current, or power-domain limits. Check the operating conditions associated with the 8 MHz clock in the datasheet, place the required local bypass capacitors at the supply pins, and confirm that any external pull-up or sensor voltage cannot exceed the selected I/O domain.
Map the 16 general-purpose I/O lines against all required ADC, timer, communication, and control functions before fixing the PCB layout. Multiplexed functions can constrain simultaneous peripheral use, so alternate pin assignments may be necessary. Route sensitive or fast-changing signals away from noisy power-stage and switching-regulator areas, and follow the manufacturer's package and exposed-pad guidance rather than relying on generic QFN conventions.
Do not treat the ATTINY43U as a pin-compatible substitute for ATTINY44 or another AVR device solely because both use a 20-pin QFN-family package. The verified search results do not confirm matching exposed pads, pin assignments, voltage limits, or peripheral functions. Any substitution requires a complete comparison of the manufacturer pinout, electrical characteristics, clock system, interrupt vector, and programming workflow against the existing PCB.
合规信息
The supplied verified excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown or not qualified rather than being inferred from general manufacturer policies.
