STM32L412KBU6 - 80MHz Cortex-M4 MCU, 128KB Flash | ST
MPN： STM32L412KBU6 ✓ 啟用中STM32L412KBU6 概覽
An ultra-low-power microcontroller is a semiconductor that combines a processing core, embedded memory, and peripherals while optimizing energy use during active, standby, shutdown, and RTC backup operation. The STM32L4 series belongs to the hierarchy of Arm Cortex-M microcontrollers, 32-bit embedded processors, and energy-conscious semiconductor platforms. Its FlexPowerControl architecture supports low-power designs in which duty-cycled sensing, communication, and control functions can remain responsive without continuous full-power operation.
The STM32L412KBU6 provides 128 KB of Flash and an Arm Cortex-M4 processor operating at up to 80 MHz. STMicroelectronics specifies 300 nA consumption in VBAT mode for the RTC and 32 x 32-bit backup registers, plus 16 nA shutdown consumption with four wakeup pins. Operation is supported from -40 °C to 85 °C or 125 °C, depending on the device variant and qualification context. The MCU also supports USB according to the manufacturer product listing and integrates low-power features suited to portable sensing and connected industrial products.
Its 1.71 V to 3.6 V operating range allows direct operation from a regulated 3.3 V rail. When powered through an external switched-mode supply, the VDD12 domain operates from 1.00 V to 1.32 V. The combination of 80 MHz processing performance, 128 KB Flash, and multiple low-power modes supports real-time control, sensor aggregation, low-rate communications, USB-connected accessories, and compact embedded nodes without requiring a separate high-performance processor.
Typical applications include battery-powered environmental sensors, USB-connected data loggers, industrial condition-monitoring terminals, compact motor-control modules, medical monitoring equipment, and secure access-control readers. The device is particularly useful when a design needs more computation than an 8-bit controller while retaining a small package and low standby-energy behavior. USB connectivity can simplify direct host-device communication without an external protocol converter when the application otherwise matches the device's USB peripheral capabilities.
Design the PCB around the exposed-pad and power-distribution requirements in the manufacturer datasheet. Place decoupling capacitors close to the supply pins, route sensitive analog inputs away from fast switching nodes, and confirm the exact package pinout before fabrication. Treat MCU substitution as a firmware and peripheral-level decision as well as a footprint decision: validate clock settings, bootloader behavior, USB configuration, low-power transitions, and analog calibration on the selected production device.
This product record combines the manufacturer's electrical limits, package information, and low-power figures with a focused drop-in comparison and application guidance. It helps engineers distinguish true same-package options from devices that merely use a similar UFQFPN outline, while keeping PCB reuse, firmware validation, and power-budget decisions explicit.
直接替換替代品，適用於 STM32L412KBU6 — 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： STM32L412KBU6 （相同外形與佔位）.
STM32L431KBU6TR
✅ 直接替換📋 參考替代品（不在目錄中）
STM32L422KBU6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM32L432KBU6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM32L442KBU6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM32L452KBU6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM32L412KBU6 最大額定值與電氣特性
| Product Type | Ultra-low-power 32-bit microcontroller |
| Processor Core | Arm Cortex-M4 with FPU |
| Maximum CPU Frequency | 80 MHz |
| Instruction Width | 32 bit |
| Embedded Flash Memory | 128 KB |
| VDD Supply Range with Internal LDO | 1.71 V to 3.6 V |
| VDD12 Supply Range with External SMPS | 1.00 V to 1.32 V |
| VBAT Mode Consumption | 300 nA |
| Shutdown Mode Consumption | 16 nA |
| Shutdown Wakeup Inputs | 4 inputs |
| RTC Backup Registers | 32 x 32-bit registers |
| 工作溫度範圍 | -40 °C to 85 °C or -40 °C to 125 °C |
| Maximum Junction Temperature | 105 °C or 130 °C |
| 封裝 | 32-pin UFQFPN, 5 x 5 mm |
| 安裝類型 | Surface mount |
| Connectivity | USB |
| Power-Saving Architecture | FlexPowerControl |
STM32L412KBU6 32-pin ufqfpn, 5 x 5 mm 腳位配置指南
STM32L412KBU6（32-pin ufqfpn, 5 x 5 mm 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： STM32L412KBU6.
請參閱 資料表 以查看完整腳位配置。
典型應用
STM32L412KBU6 適用於 6 應用s: Battery-Powered Environmental Sensors, USB-Connected Data Loggers, Industrial Condition Monitoring, Compact Motor and Actuator Control, Medical Monitoring Equipment, Secure Access-Control Readers.
Battery-Powered Environmental Sensors
The STM32L412KBU6 fits environmental sensing nodes that spend most of their operating time asleep. Its 16 nA shutdown mode and 300 nA VBAT mode provide low background consumption, while the 80 MHz Arm Cortex-M4 core can perform compensation, filtering, and interval-based sampling when activated. A 128 KB Flash budget supports sensor firmware, calibration tables, and configuration data without requiring an external memory device. Designers should include the sensor, radio, and regulator loads in the complete battery budget rather than evaluating only the MCU sleep current.
推薦
USB-Connected Data Loggers
The STM32L412KBU6 is appropriate for compact USB data loggers because it combines 128 KB Flash, USB connectivity, and an 80 MHz 32-bit processor in a 5 x 5 mm UFQFPN package. The MCU can collect and pre-process sensor data, maintain a local event log, and present the results through a USB interface. Place the USB data lines and protection components according to the manufacturer reference design, and account for the additional power and signal-integrity requirements introduced by the USB interface.
推薦
Industrial Condition Monitoring
The STM32L412KBU6 supports industrial condition-monitoring modules that combine low-frequency sensing with intermittent communications. Its 80 MHz Cortex-M4 core is sufficient for signal conditioning, filtering, threshold evaluation, and local event classification, while low-power modes reduce consumption between measurements. The 1.71 V to 3.6 V operating range supports integration with low-energy sensor rails, and the UFQFPN32 package simplifies compact board construction. Production designs must still verify the exact temperature grade, analog performance, EMC margin, and long-term sensor accuracy.
推薦
Compact Motor and Actuator Control
The STM32L412KBU6 can serve as the supervisory controller in compact motor or actuator assemblies. The 80 MHz Arm Cortex-M4 core provides responsive control-loop execution, while the low-power modes are useful in systems that remain idle between motion commands. The 128 KB Flash capacity is suitable for control algorithms, parameter storage, and diagnostics. Motor environments also require careful separation of analog and digital grounds, protection from switching transients, and validation of timer, encoder, and fault-handling functions.
推薦
Medical Monitoring Equipment
The STM32L412KBU6 is appropriate for low-power medical monitoring equipment when its electrical limits and the system risk assessment support the application. Its 32-bit Cortex-M4 core can process sensor samples, maintain timing, and implement local user-interface or communications tasks. Low shutdown and VBAT currents help extend operation between service visits, and the compact UFQFPN32 package reduces board area. Medical designs still require thorough validation of measurement accuracy, alarm behavior, electrical safety, firmware quality, and applicable healthcare regulatory requirements.
推薦
Secure Access-Control Readers
The STM32L412KBU6 fits access-control readers that combine credential I/O, local event handling, and a communications interface. The 80 MHz Cortex-M4 core can manage protocol processing and system responses, while 128 KB Flash accommodates firmware, configuration, and credential-related code. Low-power modes help maintain standby consumption in unattended installations. Designers should verify card-reader interfaces, security requirements, boot protection, update mechanisms, and the peripheral assignments of any substituted STM32L4 device before production release.
推薦
推薦產品摘要
工程參考資料，適用於 STM32L412KBU6 — 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 | STM32L431KBU6TR | STM32L422KBU6 | STM32L432KBU6 |
|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 32-pin UFQFPN, 5 x 5 mm | 32-pin UFQFPN, 5 x 5 mm | 32-pin UFQFPN, 5 x 5 mm | 32-pin UFQFPN, 5 x 5 mm |
主要差異化特點
- Combines 80 MHz processing with exceptionally low standby current (對比STM32L431KBU6TR)
- Supports a compact 5 x 5 mm implementation (對比STM32L422KBU6)
- Wide internal-LDO supply range for embedded 3.3 V designs (對比STM32L432KBU6)
設計說明
Design the supply rails around the STM32L412KBU6 operating limits of 1.71 V to 3.6 V for VDD when using the internal LDO. Place the required decoupling network close to the supply and ground pins, and account for startup, USB attachment, and active-mode current rather than using the 16 nA shutdown figure for the entire power budget. If an external SMPS supplies VDD12, operate that domain only within its specified 1.00 V to 1.32 V range.
Treat the exposed pad as a thermal and electrical connection, not as an optional mechanical feature. Follow the manufacturer land pattern and paste recommendation for the 32-pin UFQFPN package, provide a continuous ground path beneath the device where recommended, and avoid placing sensitive analog traces directly beside USB, clock, or switching-node routes. Confirm the final pin numbering against the official UFQFPN32 drawing before releasing Gerber files.
A matching package outline does not prove that every alternate STM32L4 MCU is a functional drop-in. Before substituting a candidate, compare the USB implementation, clock tree, ADC channels, timer resources, low-power modes, debug interface, boot configuration, device identifier, and firmware support. Preserve the exact STM32L412KBU6 ordering code for production traceability and run power, timing, peripheral, and brownout tests on the assembled board.
Route USB and other high-speed signals over continuous reference planes with short return paths, minimize stub branches, and apply the impedance requirements of the completed board stackup. Keep crystal and timing-sensitive traces away from switching and USB data paths. If the MCU drives external sensors through long cables, separate the analog input filtering from digital activity and validate the interface under the intended noise and common-mode conditions.
合規資訊
The manufacturer technical documentation establishes the electrical and environmental operating limits. Exact RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals declarations should be confirmed from the current STMicroelectronics product and compliance documentation for the specific ordering code.