ATTINY40-SUR - 12MHz 8-Bit AVR MCU, 4KB Flash | Microchip (Tape & Reel)
MPN： ATTINY40-SUR ✓ 啟用中ATTINY40-SUR 概覽
An 8-bit AVR microcontroller is a compact embedded controller that executes firmware instructions on a Harvard-style architecture, balancing processing capability, memory efficiency, and low power consumption. The AVR family belongs to the broader hierarchy of microcontrollers, embedded processors, and semiconductors. TinyAVR devices are particularly useful for cost-sensitive control, monitoring, signal-generation, and communication tasks where a larger MCU would add unnecessary cost or board area.
Key verified features include 4 KB flash organized as 2K by 16 words, 256 B SRAM, 12 I/O lines, 16 working registers, and an 8-bit timer/counter with two PWM channels. Its 12 MHz maximum frequency provides substantially more instruction throughput than lower-clock ATtiny devices. The 20-pin SOIC package also supports conventional surface-mount assembly while exposing enough pins for power, clock, programming, reset, I/O, and timer functions.
The AVR enhanced RISC architecture supports efficient execution of firmware commonly written for AVR-compatible toolchains. The processor architecture and instruction set should be reviewed against the manufacturer datasheet before porting code, especially when the replacement MCU has a different instruction set, peripheral arrangement, interrupt vector table, or programming interface. The supplied sources do not expose detailed ADC, comparator, timer-resolution, or electrical operating-limit values.
Typical uses include compact industrial controls, LED and general-purpose dimming, simple sensor acquisition, small motor or actuator control, battery-powered monitoring, and embedded interface modules. Its two PWM channels can support timing, dimming, or basic proportional actuator functions, while the 12 I/O lines provide flexibility for switches, indicators, sensors, and external logic.
When designing a PCB, reserve the programming and reset connections, route clock and decoupling pins according to the manufacturer reference layout, and confirm that every external signal remains within the device’s verified voltage limits. Because the verified snippets do not supply a numerical operating-voltage range, ADC resolution, pin electrical limits, or package dimensions, those values must be checked in the official ATtiny40 documentation before release to manufacturing.
This product page combines verified Microchip and distributor data, source-backed availability links, practical application guidance, and explicit data-gap markers. It does not infer unverified electrical specifications or present functional comparators as drop-in replacements when pin or peripheral compatibility has not been demonstrated.
直接替換替代品，適用於 ATTINY40-SUR — 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。
此系列的變體
與下列產品可直接替換的同系列型號： ATTINY40-SUR （相同外形與佔位）.
此產品無可直接替換的替代品。
申請替代品ATTINY40-SUR 最大額定值與電氣特性
| Microcontroller Type | 8-bit AVR RISC-based microcontroller |
| 最大時脈頻率 | 12 MHz |
| Program Memory | 4 KB flash (2K x 16) |
| Program Memory Type | ISP flash |
| Data Memory | 256 B SRAM |
| General-Purpose I/O Lines | 12 |
| General-Purpose Working Registers | 16 |
| Timer/Counter | 8-bit timer/counter |
| PWM Channels | 2 |
| Processor Architecture | AVR enhanced RISC architecture |
| 資料匯流排寬度 | 8 bit |
| 封裝 | 20-pin SOIC |
| 安裝類型 | Surface mount |
ATTINY40-SUR 20-pin soic 腳位配置指南
ATTINY40-SUR（20-pin soic 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： ATTINY40-SUR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATTINY40-SUR 適用於 6 應用s: Compact industrial control module, LED dimming and PWM control, Battery-powered sensor monitor, Small motor and actuator controller, Embedded interface and protocol bridge, Automated test fixture controller.
Compact industrial control module
The ATTINY40-SUR fits compact control modules that supervise switches, indicators, interlocks, or simple actuators. Its 8-bit AVR core operates up to 12 MHz, providing faster instruction throughput than lower-clock ATtiny options while retaining only 4 KB of flash and 256 B of SRAM for small embedded tasks. With 12 general-purpose I/O lines, the MCU can connect digital inputs and outputs without requiring a larger pin count. The two PWM channels may support status lighting, proportional output, or a basic actuator drive. Before release, verify the official voltage range, pin current limits, and industrial temperature requirements; those values are not available in the supplied snippets.
推薦
LED dimming and PWM control
The ATTINY40-SUR is suitable for small LED dimming, indicator, or sign-control boards because its verified timer/counter provides two PWM channels. The 12 MHz clock gives the firmware additional timing headroom for button handling, debouncing, status logic, and modulation updates, while 4 KB flash and 256 B SRAM remain sufficient for a compact control loop. The MCU can read a command over its 12 I/O lines and update PWM duty cycle without a larger processor. Verify output drive current, supply range, and PWM electrical limits from the official datasheet; the supplied search data does not quantify those constraints.
推薦
Battery-powered sensor monitor
The ATTINY40-SUR can serve as the controller in a small, duty-cycled sensor monitor because it is identified as a low-power CMOS 8-bit AVR MCU with 4 KB ISP flash and 256 B SRAM. Its 12 general-purpose I/O lines accommodate threshold inputs, indicators, and control signals, while the 8-bit timer/counter supports periodic sampling or wake scheduling. The two PWM outputs can also drive a sensor enable or low-rate actuator. Actual battery suitability depends on active and sleep current, ADC characteristics, and voltage limits that are not specified in the supplied snippets; obtain those values before calculating average power.
推薦
Small motor and actuator controller
The ATTINY40-SUR can control small actuators where two PWM outputs and modest real-time logic are sufficient. Its 12 MHz AVR core can execute motor-state logic faster than many low-clock 8-bit designs, while two verified PWM channels can generate command or modulation signals for LED indicators, fans, solenoids, or transistor-driven loads. The MCU itself is not a power driver, so the design must add suitable transistors, flyback protection, current sensing, and fault handling. Verify pin drive capability and absolute maximum ratings in the official datasheet because the retrieved snippets provide only core MCU specifications.
推薦
Embedded interface and protocol bridge
The ATTINY40-SUR is appropriate for a small embedded interface node that converts digital commands into control outputs or monitors status inputs. Its 4 KB ISP flash supports firmware updates during production, while 12 I/O lines can carry serial signals, configuration inputs, and logic-level handshakes. The 12 MHz clock and compact AVR instruction set make it responsive for lightweight protocol handling without the cost of a 32-bit MCU. Before selecting it for a new protocol bridge, verify which serial peripherals are available and confirm their pin multiplexing; the supplied snippets list PWM and timers but do not provide a complete peripheral inventory.
推薦
Automated test fixture controller
The ATTINY40-SUR can coordinate a small automated test fixture by sequencing digital stimulus, reading pass or fail inputs, and driving indicator or actuator outputs. Its 12 MHz maximum clock supports responsive state-machine firmware, and the 8-bit timer/counter with two PWM channels can provide timing or stimulus functions where required. The 20-pin SOIC package supports compact fixture-controller PCBs, while ISP programming simplifies production firmware loading. Designers must confirm test-point access, input thresholds, output drive limits, isolation, and supply tolerances from the official electrical documentation before using the MCU near external test equipment.
推薦
推薦產品摘要
工程參考資料，適用於 ATTINY40-SUR — 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 | ATTINY40-SUR | ATTINY40-SURR |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SOIC | 20-pin SOIC | 20-pin SOIC |
| Architecture | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC |
| Maximum Clock Frequency | 12 MHz | 12 MHz | 12 MHz |
| Flash Memory | 4 KB | 4 KB | 4 KB |
| SRAM | 256 B | 256 B | 256 B |
| General-Purpose I/O | 12 lines | 12 lines | 12 lines |
| PWM Channels | 2 channels | 2 channels | 2 channels |
| Ordering Suffix | -SU distributor sourcing entry | -SU | -UR reel-oriented ordering variant |
主要差異化特點
- Exact ATtiny40 identity avoids uncertain cross-device migration (對比ATTINY461V-10SUR)
- Two verified PWM channels support compact modulation functions (對比ATMEGA8A-AUR)
- Higher verified clock than many compact low-power ATtiny designs (對比ATtiny40-SUR)
設計說明
Place programming and reset access on test pads or a header even if the production PCB is primarily intended for autonomous operation. This preserves ISP programming during prototype bring-up and field refurbishment. Follow the official Microchip pinout and recommended decoupling arrangement; the verified snippets identify ISP flash and a 20-pin SOIC but do not provide exact package pin numbers, capacitor values, or layout dimensions.
Validate the power architecture against the official ATtiny40 electrical limits before connecting external loads. The verified snippets mention 3.3 V but do not establish the full operating-voltage range, so 3.3 V cannot be treated as a complete design specification. Check regulator tolerance, startup behavior, decoupling, I/O voltage domains, and load-switch transients. Do not use the MCU pins to drive motors, relays, or other high-current loads directly.
At the verified 12 MHz maximum clock, keep clock and high-speed control traces short, route them away from switching nodes, and provide a quiet return path. Use series damping or slower edge rates where ringing appears. Because exact clock-pin mapping, rise/fall limits, output-drive data, and recommended layouts are absent from the supplied snippets, validate them from the official datasheet and measure the assembled board rather than extrapolating.
Do not assume that another 20-pin 8-bit MCU with 4 KB flash is automatically interchangeable. ATTINY461V-10SUR and ATTINY1634 variants appeared in comparison results, but the provided evidence does not prove identical pin multiplexing, peripheral behavior, interrupt layout, or firmware compatibility. For a true drop-in decision, compare every pin, voltage domain, reset and programming interface, timer mapping, and application timing requirement against manufacturer documentation.
合規資訊
The supplied search results do not provide exact compliance declarations for ATTINY40-SUR. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status must be confirmed from current Microchip documentation. AEC-Q100 is not applicable unless a specific automotive-qualified ordering code is identified and supported by a qualification statement.