ATTINY43U-SU - 8MHz 4KB Flash AVR MCU | Microchip Technology
MPN： ATTINY43U-SU ✓ 啟用中ATTINY43U-SU 概覽
An 8-bit AVR microcontroller is a compact semiconductor controller that executes a reduced-instruction-set computer architecture embedded directly into a product. It belongs to the hierarchy of 8-bit microcontroller, RISC processor, embedded controller, and semiconductor. ATtiny devices combine program Flash, data EEPROM, SRAM, timers, serial interfaces, and I/O ports in one package, allowing a product to perform control and communication tasks without a separate processor.
The ATTINY43U family combines 4 KB Flash with 64 bytes of EEPROM and 256 bytes of SRAM, providing separate areas for firmware, persistent configuration data, and volatile working memory. Its 16 I/O lines support digital sensing and control, while two 8-bit timer/counters with two PWM channels support timing, waveform generation, motor control, and dimming functions. The internal oscillator removes the need for an external clock in designs that do not require precise external frequency referencing.
The ATtiny43U architecture provides 120 instructions, most of which execute in a single clock cycle, according to the manufacturer product description. Its register-based instruction set and 32 working registers support efficient control code. The device is also identified as an ultra-low-voltage part with a 0.9 V operating point, making it relevant to systems powered from low-energy cells or tightly regulated low-voltage rails.
Typical uses include compact sensor nodes, battery-powered instruments, simple motor controls, LED lighting systems, low-cost control panels, and embedded products requiring a small pin-count microcontroller. The combination of 16 I/O lines and two PWM channels is particularly useful for compact devices that must operate several discrete inputs, drive indicators, and generate a controlled output waveform.
When designing around the ATTINY43U-SU, verify the operating-voltage limits and current consumption required by the system power budget against the manufacturer datasheet. Preserve adequate decoupling near the supply pins and route high-current loads away from sensitive control traces. Programming, fuse settings, clock options, and application behavior should be validated with the AVR toolchain and the device-specific programming specification before production.
This product record combines manufacturer specifications, package information, practical application guidance, and verified drop-in alternatives. It also highlights differences among identified same-package variants so engineers can assess compatibility before approving a replacement.
直接替換替代品，適用於 ATTINY43U-SU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
ATTINY43U-SUR
✅ 直接替換📋 參考替代品（不在目錄中）
ATTINY43U-SU 最大額定值與電氣特性
| Product Type | 8-bit AVR RISC microcontroller |
| Program Memory Size | 4 KB (2K x 16) |
| EEPROM Size | 64 bytes |
| SRAM Size | 256 bytes |
| Maximum Clock Speed | 8 MHz |
| General-Purpose I/O Lines | 16 lines |
| General-Purpose Working Registers | 32 registers |
| Timer/Counter Count | 2 timer/counters |
| Timer Width | 8 bits |
| PWM Channels | 2 channels |
| Oscillator Type | Internal |
| Architecture | AVR enhanced RISC |
| Instruction Set | 120 instructions |
| Operating Voltage | 0.9 V minimum identified operating point |
| 封裝 | 20-pin SOIC |
| Package Width | 7.50 mm |
| Package Body Length | 0.295 inch |
| Temperature Grade | Industrial temperature grade |
| Environmental Classification | Green |
ATTINY43U-SU 0.295 inch 腳位配置指南
ATTINY43U-SU（0.295 inch 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATTINY43U-SU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATTINY43U-SU 適用於 6 應用s: Battery-Powered Sensor Node, Compact Motor Control, LED Lighting Controller, Low-Cost Control Panel, Portable Measurement Instrument, Smart Home Sensor Interface.
Battery-Powered Sensor Node
The ATTINY43U-SU fits compact battery-powered sensor nodes because it combines 4 KB of Flash, 256 bytes of SRAM, 64 bytes of EEPROM, and an ultra-low-voltage architecture with a 0.9 V operating point. Sixteen I/O lines can support digital sensors, status indicators, and simple control outputs without a separate I/O expander. The 8 MHz clock provides sufficient execution speed for sampling, filtering, and communication tasks. Design the supply around the battery voltage range, account for regulator efficiency, and use low-leakage states to extend operating time.
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Compact Motor Control
The ATTINY43U-SU can support compact motor-control functions using its two 8-bit timer/counters and two PWM channels. The timers provide basic frequency and timing resources, while PWM can regulate actuator drive levels or indicator brightness. Sixteen I/O lines allow the controller to manage direction controls, limit switches, position inputs, and status feedback. For inductive or high-current loads, use external transistors and current limiting, and verify that the AVR firmware provides the required startup and stall behavior.
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LED Lighting Controller
The ATTINY43U-SU is suitable for small LED-lighting controllers because two PWM channels can generate adjustable duty cycles for brightness or indication functions. Its 16 I/O lines support push-button inputs, mode selection, occupancy sensing, and fault signaling, while 4 KB of Flash accommodates lighting tables and control logic. External transistor or constant-current circuitry should handle LED drive current. Validate PWM timing and update behavior against the connected LED driver rather than driving load current directly from the microcontroller pins.
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Low-Cost Control Panel
ATTINY43U-SU can serve as the controller for a compact keypad, selector, or menu-driven panel. Sixteen I/O lines accommodate switches, LEDs, and display-control signals, while the two timers support debouncing, periodic scanning, and indicator blinking. The 4 KB Flash capacity allows structured firmware for multiple operating modes, and the 64-byte EEPROM can retain basic settings. The 20-pin SOIC package supports a modest board footprint, although an I/O expander may be preferable when many panel connections exceed 16 lines.
推薦
Portable Measurement Instrument
The ATTINY43U-SU can manage a portable measurement instrument when the design needs low-voltage operation, local control, and modest data processing. The 8 MHz AVR core and 4 KB Flash can perform calibration, measurement sequencing, and local display or data-transfer control. Sixteen I/O lines support operating buttons, status LEDs, and digital sensor connections. Use an external precision analog front end for demanding measurements, and keep firmware within the 4 KB program-memory limit while allowing stack and SRAM usage for temporary data.
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Smart Home Sensor Interface
The ATTINY43U-SU can act as the local interface controller for a compact smart-home sensor or actuator node. Sixteen I/O lines allow it to read digital sensors and operate simple relays or indicators, while two PWM channels support gentle actuator modulation. Its 0.9 V operating point and internal oscillator suit low-power designs, and the 20-pin SOIC package keeps the board compact. Firmware should include debouncing, fault states, and safe defaults so loss of power or communication does not leave an actuator in an unsafe condition.
推薦
推薦產品摘要
工程參考資料，適用於 ATTINY43U-SU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATTINY43U-SUR |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 20-pin SOIC | 20-pin SOIC - same |
| Product Type | 8-bit AVR RISC microcontroller | 8-bit AVR RISC microcontroller |
| Program Memory | 4 KB (2K x 16) | 4 KB (2K x 16) |
| EEPROM | 64 bytes | 64 bytes |
| SRAM | 256 bytes | 256 bytes |
| Maximum Clock Speed | 8 MHz | 8 MHz |
| General-Purpose I/O | 16 lines | 16 lines |
| Timer/Counter Resources | Two 8-bit timer/counters with two PWM channels | Two 8-bit timer/counters with two PWM channels |
| Oscillator | Internal | Internal |
主要差異化特點
- Larger memory configuration than the listed ATTINY26L-8SU comparison (對比ATTINY26L-8SU)
- Broader I/O resource for compact embedded controllers (對比ATTINY26L-8SU)
- Two dedicated PWM channels in the same 20-pin SOIC footprint (對比ATTINY43U-SUR)
設計說明
Begin with a complete power-budget calculation covering the ATtiny43U operating current, I/O loads, pull resistors, sensors, and downstream circuitry. The 0.9 V operating point enables low-voltage operation, but the regulator must remain within the device's voltage limits across battery range, temperature, and load transients. Place the required bypass capacitor close to VCC and GND, and confirm the startup voltage and reset behavior so the firmware never operates from an uncontrolled rail.
Use the 20-pin SOIC package drawing and pin-description table from the Microchip ATtiny43U datasheet when assigning PCB tracks. Keep programming-interface and reset-related routes accessible for manufacturing test, preserve the package orientation mark in the assembly drawing, and verify that every exposed connection has a defined function. Check pad dimensions against the selected package rather than relying on a generic SOIC footprint because body widths and lead details can vary.
Keep sensitive analog and communication routes away from switching nodes and high-current load paths. Provide a low-impedance ground connection from the device to the local bypass capacitor, and use compact return paths for digital output edges. If the product includes an external oscillator or radio module, isolate their supply and signal routing from the AVR clock and timer inputs to reduce coupling into timing-sensitive control functions.
Do not treat ATTINY43U-SUR as an arbitrary replacement without confirming the ordering and packing format, while also confirming that the electrical specifications and package remain unchanged. In firmware, account for the 4 KB Flash limit, 256-byte SRAM capacity, and 64-byte EEPROM size before adding libraries. Unused inputs should be configured deliberately, and brownout, watchdog, reset, and fuse behavior should be validated on hardware rather than inferred only from source code.
合規資訊
The product listing identifies the device as Green and industrial temperature grade, but it does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals compliance.