ATTINY426-MF - 20MHz 4KB Flash AVR Microcontroller | Microchip
料号： ATTINY426-MF ✓ 量产中ATTINY426-MF 概述
A microcontroller is a programmable integrated circuit containing a processor core, memory, peripherals, and I/O circuitry on one semiconductor device. The ATTINY426 belongs to the tinyAVR 2 family, a compact branch of the AVR 8-bit RISC microcontroller portfolio. This device hierarchy combines a small instruction set, event-control peripherals, and flexible pin multiplexing in a low-pin-count package suitable for embedded control systems.
Key features include 20 MHz maximum CPU operation, 4 KB of Flash for program storage, 512 bytes of SRAM for working variables, and 128 bytes of EEPROM for nonvolatile data. The device also provides I2C, SPI, and UART/USART connectivity, enabling communication with sensors, serial memories, transceivers, and host systems. Its industrial temperature range supports demanding industrial control, sensor, and embedded interface applications.
The AVR processor architecture provides an 8-bit RISC execution model with a hardware multiplier for efficient arithmetic operations. Its 4 KB program memory is sufficient for compact control logic, protocol handlers, state machines, and mixed analog-to-digital control functions. The 20-pin VQFN package also offers a practical balance between functional connectivity and board-space savings, although its exposed-pad construction requires careful PCB layout and assembly planning.
Typical uses include industrial sensor nodes, compact motor and actuator controllers, serial protocol bridges, battery-powered monitoring equipment, and low-cost embedded automation modules. The device is particularly suitable when a design needs more general-purpose performance than a simple logic IC while retaining a compact footprint, low pin count, and familiar AVR software toolchain.
PCB implementation should follow the exact land pattern, exposed-pad, and solder-reflow requirements in the Microchip package drawing. Firmware development should preserve sufficient Flash, SRAM, and EEPROM headroom for interrupts, stack use, bootloader requirements, and field updates rather than treating the memory ratings as the entire application capacity.
This page consolidates manufacturer specifications, package information, sourcing details, application guidance, and defensible drop-in comparison points. It also distinguishes a genuine pin-compatible replacement from parts that merely belong to the broader microcontroller category, helping engineers make a footprint-safe sourcing decision.
直接替换替代料： ATTINY426-MF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
ATTINY826-MFR
✅ 直接替换📋 参考替代料（不在目录中）
ATTINY426-MF 最大额定值与电气特性
| Product Type | 8-bit Microcontroller |
| Series | tinyAVR 2 |
| CPU Core | AVR RISC |
| Architecture | 8-bit |
| Maximum CPU Frequency | 20 MHz |
| Hardware Multiplier | Yes |
| Flash Memory | 4 KB (4K x 8) |
| SRAM | 512 bytes |
| EEPROM | 128 bytes |
| Supply Voltage Levels | 2.5 V, 3.3 V, 5 V |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 20-pin VQFN |
| Package Dimensions | 3 x 3 mm |
| Packaging | Tray |
| Connectivity | I2C, SPI, UART/USART |
| RoHS 状态 | Compliant |
| Green Classification | Green |
ATTINY426-MF 3 x 3 mm 引脚配置指南
ATTINY426-MF（3 x 3 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： ATTINY426-MF.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATTINY426-MF 适用于 6 应用s: Industrial Sensor Node, Serial Protocol Bridge, Compact Actuator Controller, Battery-Powered Monitoring Equipment, LED Lighting Controller, Embedded Automation Controller.
Industrial Sensor Node
The ATTINY426-MF fits compact industrial sensor nodes that must acquire measurements, apply local filtering, and forward status data over a serial link. Its 20 MHz AVR core provides useful processing headroom for control logic, while 4 KB Flash, 512 bytes SRAM, and 128 bytes EEPROM support a small state machine and configuration storage. I2C and SPI permit connection to sensors and serial memories, while UART/USART supports a host or gateway. The -40°C to +125°C rating provides useful thermal margin in equipment that operates near industrial machinery, provided the sensor, communications circuitry, and power source meet their own specifications.
推荐
Serial Protocol Bridge
The ATTINY426-MF is suitable for a compact serial bridge that converts between UART/USART and a peripheral bus such as I2C or SPI. The 20 MHz processor can manage framed communication, command parsing, status reporting, and basic timeout handling without occupying substantial board space. Its 4 KB Flash is appropriate for a focused protocol implementation, while 512 bytes SRAM supports receive buffers and protocol state. Designers should budget stack and interrupt overhead and use the manufacturer's timing and pin-multiplexing guidance before selecting a particular operating speed or peripheral instance.
推荐
Compact Actuator Controller
The ATTINY426-MF can control small actuators, relays, valves, or indicators where deterministic 8-bit logic, local I/O, and serial adjustment are more important than high processing throughput. Its hardware multiplier assists with scaling, timing, and proportional-control calculations, while PWM-capable timer resources can be used for motor, dimming, or proportional valve commands. The 20-pin VQFN preserves board area, and the 125°C upper temperature rating supports industrial environments. Final designs must account for inductive transients, driver current, thermal rise, and the voltage margin required by attached loads.
推荐
Battery-Powered Monitoring Equipment
The ATTINY426-MF is appropriate for battery-powered monitoring equipment that periodically measures an input, evaluates a threshold, and reports an event through UART, SPI, or I2C. Its compact 20-pin VQFN package supports dense instrument designs, while the 128-byte EEPROM can retain calibration or identification values and 4 KB Flash can hold the main acquisition and reporting firmware. Low-power operation should be designed around the exact sleep modes, wake-up sources, and peripheral clock requirements in the family data sheet. Battery life also depends on sensor standby current, regulator efficiency, and radio or communications duty cycle.
推荐
LED Lighting Controller
The ATTINY426-MF can serve as a compact controller for constant-current LED strips, status indicators, or programmable lighting modules. Timer resources can generate the required PWM waveform, while 4 KB Flash is sufficient for calibration tables, lighting sequences, communication commands, and fault handling. The 3 x 3 mm VQFN helps reduce board area in integrated luminaires, and UART or I2C provides a path for configuration from an external controller. LED reliability depends on correct current limiting, driver topology, thermal management, dimming behavior, and protection against wiring or switching transients.
推荐
Embedded Automation Controller
The ATTINY426-MF supports compact embedded automation modules that combine digital inputs, outputs, communications, and local decision logic. Its 8-bit AVR core and hardware multiplier are adequate for sequencing, counting, debouncing, diagnostics, and basic closed-loop calculations, while I2C, SPI, and UART/USART allow expansion with sensors and remote modules. The industrial temperature range and small VQFN footprint help it fit into space-constrained equipment. For safety-related or long-life deployments, developers should include watchdog recovery, brownout behavior, write endurance management, and production firmware traceability in the design.
推荐
推荐产品汇总
工程参考数据： ATTINY426-MF ——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 | ATTINY826-MFR |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 20-pin VQFN (3 x 3 mm) | 20-pin VQFN (3 x 3 mm) |
| CPU Architecture | 8-bit AVR RISC | 8-bit AVR |
| Maximum CPU Frequency | 20 MHz | 20 MHz |
| Flash Memory | 4 KB (4K x 8) | 8 KB |
关键差异点
- Lower program-memory demand for focused embedded functions （对比 ATTINY826-MFR)
- Full 20 MHz operating-class match within the same tinyAVR 2 family （对比 ATTINY826-MFR)
- Footprint-compatible family option avoids a package conversion （对比 ATTINY826-MFR)
设计说明
Use the Microchip package drawing for the 20-pin VQFN land pattern rather than adapting a generic QFN footprint. Preserve the exposed-pad geometry, copper thermal area, solder-mask clearance, and paste pattern specified by the manufacturer. Because the device has no protruding leads, an incorrect pad-length or paste-volume choice can create solder bridging or inadequate thermal coupling. Review the assembly drawing alongside the electrical pin table before releasing the PCB files.
Confirm the complete power-supply requirement against the ATTINY426-MF electrical characteristics in the family data sheet, including operating voltage, reset behavior, clock startup, and I/O limits. The device is identified as supporting 2.5 V, 3.3 V, and 5 V operating levels, but external sensors and communications circuits may impose different rail requirements. Place local bypass capacitors at the supply pins using the layout guidance in the manufacturer documentation and test startup, reset, and brownout behavior across the intended input range.
Do not treat the nominal 4 KB Flash and 512-byte SRAM as entirely available to application code. Interrupt vectors, bootloader code, stack depth, library routines, receive buffers, and EEPROM wear-management routines consume additional memory. Estimate worst-case stack use and leave margin for future maintenance. Also confirm the exact programming and boot behavior before replacing ATTINY426-MF with ATTINY826-MFR, since the additional Flash changes the memory organization of the firmware image.
合规信息
The ATTINY426-MF listing identifies the device as RoHS Compliant and Green. No separate REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification statement is established by the available manufacturer and distributor information.
