STM32L451REI6 - 80MHz Cortex-M4 512KB MCU | STMicroelectronics
料号： STM32L451REI6 ✓ 量产中STM32L451REI6 概述
A microcontroller is a programmable system-on-chip that integrates a processor core, memory, peripherals, and communication interfaces onto one component. The Cortex-M4 core gives the STM32L451 a compact architecture suited to real-time control, while the STM32L4 family emphasizes low-power operation. In the product hierarchy, this device is an MCU, an embedded processing component within the broader semiconductor category, and it bridges general-purpose embedded control with specialized analog and audio acquisition.
Three characteristics distinguish the STM32L451REI6 for compact, low-power designs. Its 80 MHz Cortex-M4 core delivers high processing performance for control algorithms and protocol handling. The 512 KB Flash capacity supports larger embedded programs and data storage than entry-level Cortex-M devices. The integrated DFSDM block supports digital sigma-delta conversion applications, while the analog and audio feature set broadens the device's usefulness for sensor and signal-chain designs.
The device belongs to STMicroelectronics' STM32L4 family, which combines a high-performance Arm Cortex-M4 core with ultra-low-power design goals and extensive peripheral integration. Its 160 KB SRAM provides working memory for data buffering, display or communications handling, and interrupt-driven acquisition. The 64-UFBGA land-grid array reduces PCB footprint compared with leaded packages and supports dense products with limited board area.
Typical applications include low-power sensor nodes, industrial monitoring equipment, connected measurement instruments, low-power audio signal conditioning, battery-operated portable systems, and compact control boards. Its 80 MHz processing headroom allows digital filtering and system control to coexist with communication tasks, while the DFSDM capability can assist with delta-sigma front ends when appropriate analog support is also configured.
When laying out the PCB, follow the manufacturer's land pattern, pad, and via recommendations for the 64-UFBGA package. Confirm the pin multiplexing, supply requirements, decoupling, clock configuration, and exposed-pad connection in the STM32L451xx datasheet before release. Firmware migration should be checked against peripheral differences because devices in the STM32L4 family may not share identical clock trees, analog blocks, or low-power feature sets.
This page combines the manufacturer's device description with practical guidance on package handling, memory sizing, peripheral use, and substitution. It also provides parameter comparisons for nearby STMicroelectronics STM32L4 devices so engineers can identify a same-footprint option while checking flash, SRAM, temperature-range, and peripheral differences before committing to a drop-in replacement.
直接替换替代料： STM32L451REI6 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： STM32L451REI6 （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature Range.
STM32L451RET6
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →STM32L452RET6
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →STM32L462RET6
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
STM32L451REI6 最大额定值与电气特性
| Core | Arm Cortex-M4 with FPU |
| Architecture | 32-bit Arm Thumb instruction set |
| 最大时钟频率 | 80 MHz |
| Peak Performance | 100 DMIPS |
| Flash Memory | 512 KB |
| SRAM | 160 KB |
| Digital Filter Sigma-Delta Modulator | Supported |
| 封装 | 64-UFBGA, 5 x 5 mm |
| 安装类型 | Surface Mount |
| Power Class | Ultra-low-power |
| Analog Features | Supported |
| Audio Features | Supported |
STM32L451REI6 64-ufbga, 5 x 5 mm 引脚配置指南
STM32L451REI6（64-ufbga, 5 x 5 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： STM32L451REI6.
请参阅 数据手册 以查看完整引脚配置。
典型应用
STM32L451REI6 适用于 6 应用s: Industrial Sensor Nodes, Connected Measurement Instruments, Battery-Powered Portable Systems, Low-Power Audio Signal Conditioning, Compact Control Boards, Digital Filter and Sensor Interface Designs.
Industrial Sensor Nodes
The STM32L451REI6 fits compact industrial sensor nodes that periodically acquire measurements, evaluate thresholds, and transmit results. Its 80 MHz Cortex-M4 core with FPU provides processing headroom for filtering and control, while 160 KB of SRAM supports acquisition buffers and communication stacks. The 512 KB of Flash accommodates protocol drivers, diagnostics, and update logic. Deploy the device in a system that uses its low-power modes between samples to reduce energy consumption. Confirm analog limits, supply voltage, and wake-up timing in the manufacturer datasheet, and reserve decoupling close to each supply ball.
推荐
Connected Measurement Instruments
For connected measurement instruments, the STM32L451REI6 combines 80 MHz processing with 512 KB of Flash and 160 KB of SRAM, allowing calibration, data conditioning, and communication software to run on one controller. Its analog and audio capabilities make it useful for equipment that handles small analog signals or sound-related acquisition. The 64-UFBGA package supports compact front panels and portable instruments. Validate the ADC, audio interface, and clock requirements for each signal path, and use the STM32L451xx datasheet to confirm analog pin multiplexing before assigning the board.
推荐
Battery-Powered Portable Systems
The STM32L451REI6 is appropriate for battery-powered portable systems because it is an ultra-low-power STM32L4 MCU with a 5 x 5 mm 64-UFBGA package. The 80 MHz core can execute responsive user-interface or control logic, and the 160 KB of SRAM permits short bursts of buffered data without requiring external memory. Select the lowest-power operating mode that still satisfies wake-up latency, then size the battery around the measured active and sleep currents. Check the temperature behavior and supply range of the exact ordering suffix in the manufacturer documentation.
推荐
Low-Power Audio Signal Conditioning
The STM32L451REI6 suits low-power audio signal conditioning where a compact controller must perform filtering, level processing, and control. Its Arm Cortex-M4 FPU accelerates common floating-point DSP operations, while the family's audio support and DFSDM block provide resources for compatible delta-sigma signal paths. The 512 KB of Flash offers room for algorithm tables and firmware. Validate the audio interface, sampling requirements, and analog front end against the STM32L451xx datasheet, and keep sensitive signal routing away from high-current switching paths to reduce interference.
推荐
Compact Control Boards
The STM32L451REI6 works well in compact control boards that combine real-time processing, communications, and local status indication. Its 80 MHz Cortex-M4 performance, 512 KB of Flash, and 160 KB of SRAM are balanced for control tasks without requiring a larger package. The 64-UFBGA land-grid array reduces routing congestion in space-constrained boards while retaining access to the STM32L4 peripheral set. Use the manufacturer's recommended land pattern, keep power and ground placement consistent with the reference layout, and verify alternate-function assignments for every external peripheral connection.
推荐
Digital Filter and Sensor Interface Designs
The STM32L451REI6 is applicable to sensor-interface designs that use the digital filter sigma-delta modulator and require local digital processing. The DFSDM resource can complement suitable sensor front ends, while the Cortex-M4 core handles configuration, calibration, and communication. Its 160 KB of SRAM provides useful working space for filtered samples and control state. Confirm DFSDM channel availability, pin multiplexing, clock requirements, and analog signal limits against the STM32L451xx datasheet before routing sensor inputs and establishing the board's grounding strategy.
推荐
推荐产品汇总
工程参考数据： STM32L451REI6 ——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 | STM32L451RET6 | STM32L452RET6 | STM32L462RET6 |
|---|---|---|---|---|
| Package | 64-UFBGA (5x5) | 64-UFBGA (5x5) | 64-UFBGA (5x5) | 64-UFBGA (5x5) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Processor Core | Arm Cortex-M4 with FPU | Arm Cortex-M4 with FPU | Arm Cortex-M4 with FPU | Arm Cortex-M4 with FPU |
| Maximum Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash Memory | 512 KB | 512 KB | 512 KB | 512 KB |
| SRAM | 160 KB | 160 KB | 256 KB | 256 KB |
| Architecture | 32-bit | 32-bit | 32-bit | 32-bit |
| Power Class | Ultra-low-power | Ultra-low-power | Ultra-low-power | Ultra-low-power |
| Specialized Features | Analog, audio and DFSDM support | Analog, audio and DFSDM support | Expanded STM32L4 feature set | Expanded STM32L4 feature set |
关键差异点
- Direct STM32L451 family functional match （对比 STM32L451RET6)
- Compact land-grid-array footprint for space-constrained boards （对比 STM32L452RET6)
- Hardware floating-point performance for real-time control （对比 STM32L462RET6)
设计说明
Use the STM32L451xx manufacturer's 64-UFBGA land pattern without changing pad dimensions or via geometry. Place input and bulk decoupling capacitors close to their associated supply balls, connect the ground structure to the package ground assignments shown in the package drawing, and route high-current outputs away from analog and debug nets. Verify the exposed-pad or thermal-ball connection in the exact package section before fabrication.
Build the power budget from the exact operating mode, clock, peripheral load, and I/O state. The 80 MHz Cortex-M4 core can process quickly, but active current and voltage determine energy use during each wake interval. Select the lowest-performance clock that meets control latency, disable unused peripherals, and use the manufacturer current-consumption tables for a board-level estimate rather than relying on a single nominal operating point.
Do not assume that two STM32L4 MCUs in the same UFBGA package are software- or pin-identical. Check alternate-function mappings, oscillator pins, debug assignments, supply pins, analog-capable balls, and peripheral clock requirements. The L451, L452, and L462 families may differ in SRAM, low-power modes, analog resources, and security features, so a replacement requires both schematic review and firmware validation.
Keep sensor, audio, and other high-impedance analog routes short and isolate them from switching and digital clock nets. Confirm whether a selected ball is analog-capable, maintain the recommended analog supply arrangement, and place external filtering components close to the source. If DFSDM channels are used, evaluate their digital filter configuration and clock requirements against the signal bandwidth before fixing analog front-end values.
合规信息
The STM32L451REI6 is an industrial-temperature ordering option rather than an automotive-qualified part. Environmental and substance-compliance declarations should be confirmed for the exact order code before a regulated production release.
