STM32L451RCT6 - 80MHz Cortex-M4 MCU 256KB | STMicroelectronics
MPN: STM32L451RCT6 ✓ ActiveSTM32L451RCT6 Overview
An ultra-low-power microcontroller is a semiconductor device optimized to complete control, sensing and communication tasks while minimizing energy consumption. The STM32L451 belongs to the STM32L4 low-power microcontroller family, combining an Arm Cortex-M4 RISC core with embedded Flash, SRAM, analog peripherals, digital interfaces and power-management functions. This hierarchy places the device between general-purpose application processors and simple fixed-function controllers.
The device operates at up to 80 MHz and provides 256 KB of Flash for firmware and data storage. Its 32-bit architecture supports efficient handling of control loops, communications protocols, digital filtering and floating-point calculations. The integrated DFSDM feature is particularly useful for direct digital conversion of sigma-delta modulators and analog signals. The 64-LQFP package provides a relatively large lead pitch and facilitates assembly, inspection and hand rework compared with fine-pitch QFN packages.
The STM32L451 device family is positioned for applications where energy efficiency and real-time control matter. Relevant peripheral combinations can support industrial sensing, low-power instrumentation, connected equipment, analog measurement and compact control systems. Its 80 MHz Cortex-M4 core provides substantially more processing headroom than low-speed microcontrollers while retaining the efficiency benefits of an embedded architecture.
Typical uses include industrial sensor controllers, digital audio and analog measurement equipment, building automation modules, compact industrial gateways, battery-operated instruments and low-energy embedded control boards. The 64-pin LQFP format is especially convenient for prototypes and mixed-signal designs because it exposes more I/O than smaller packages and avoids difficult inspection of fine-pitch leads.
Designers should plan the power tree around the operating mode, peripheral load and retention requirements because performance and current consumption are closely related. Decoupling should be placed close to the supply pins, unused inputs should be configured appropriately, and firmware should exercise the low-power modes when energy use is important. The DFSDM and analog circuitry also require careful grounding and signal-routing discipline to preserve measurement quality.
This product page consolidates the verified device identity, package information, practical design guidance, application fit and strict drop-in alternatives. It also distinguishes exact same-footprint options from parts that require different packages, helping engineers shorten sourcing and redesign work before committing to a PCB change.
Drop-in alternatives for STM32L451RCT6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32L451RCT6 (same form factor and footprint) — differing in Flash Memory, Package.
STM32L451RCT3
✅ Drop-In📋 Reference alternative (not in catalog)
STM32L452RCT6
✅ Drop-In📋 Reference alternative (not in catalog)
STM32L451RET6
✅ Drop-InContact for price
View Datasheet →STM32L462RET6TR
✅ Drop-In📋 Reference alternative (not in catalog)
STM32L451RCT6 Maximum Ratings & Electrical Characteristics
| Product Type | 32-bit ultra-low-power microcontroller |
| Processor Core | Arm Cortex-M4 with FPU |
| Maximum CPU Frequency | 80 MHz |
| Flash Memory | 256 KB |
| Instruction Set | 32-bit ARM RISC |
| Package | 64-LQFP (10 mm x 10 mm) |
| Pin Count | 64 pins |
| Mounting Type | Surface mount |
| Digital Filter for Sigma-Delta Modulators | DFSDM capable |
| Core Architecture | High-performance Arm Cortex-M4 RISC |
STM32L451RCT6 64-lqfp (10 mm x 10 mm) Pin Configuration Guide
Pin configuration for STM32L451RCT6 (64-lqfp (10 mm x 10 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM32L451RCT6.
Refer to the datasheet for full pin configuration.
Typical Applications
STM32L451RCT6 is suitable for 6 applications: Industrial Sensor Controller, Low-Power Data Acquisition, Building Automation Module, Connected Industrial Gateway, Battery-Operated Instrument, Compact Audio Processing Controller.
Industrial Sensor Controller
The STM32L451RCT6 fits industrial sensor controllers that must process measurements locally while maintaining a compact, low-power design. Its Arm Cortex-M4 core operates up to 80 MHz, providing headroom for filtering, calibration and communication tasks, while the 256 KB of Flash supports embedded firmware, drivers and protocol stacks. The 64-LQFP package exposes a generous set of pins for sensors, digital interfaces and status indicators. Designers can use the DFSDM capability when the selected sensor includes a sigma-delta modulator, reducing the need for separate digital conversion hardware.
Recommended
Low-Power Data Acquisition
The STM32L451RCT6 is suitable for low-power data-acquisition equipment that combines analog measurement with local signal processing. Its 80 MHz Cortex-M4 core can execute digital filtering and control logic without an external processor, while DFSDM support provides a direct path for compatible sigma-delta sensor outputs. The 256 KB of Flash accommodates configuration, calibration tables and firmware, and the 64-pin LQFP package makes analog and digital routing accessible on a relatively forgiving board layout. Power consumption should be optimized through the device operating modes and peripheral clock gating.
Recommended
Building Automation Module
The STM32L451RCT6 can serve as the central controller in a building-automation module connected to occupancy, temperature and environmental sensors. The 80 MHz Cortex-M4 processor handles protocol tasks and local logic, and the 256 KB Flash provides room for firmware updates and configuration storage. Its 64-pin LQFP package is practical for modules that need numerous connections to sensors, relays, communication transceivers and status LEDs. Low-power operating modes are valuable in battery-powered or energy-harvested installations where the duty cycle is controlled by environmental conditions.
Recommended
Connected Industrial Gateway
The STM32L451RCT6 works well in a compact gateway that aggregates local sensor data and forwards it over a serial or industrial network link. Its 80 MHz Cortex-M4 core supports protocol handling, background tasks and real-time control, while 256 KB of Flash is suitable for embedded networking stacks and update handlers. The 64-LQFP package provides enough pins for a network interface, status indicators, configuration interface and expansion headers. A practical design should isolate communications transceivers from sensitive analog sections and validate firmware timing against the selected peripheral set.
Recommended
Battery-Operated Instrument
The STM32L451RCT6 is appropriate for battery-operated instruments because the STM32L451 family emphasizes ultra-low-power operation while retaining an 80 MHz Cortex-M4 processing core. The MCU can perform control, measurement and communications tasks during active periods and use its low-power modes between samples to reduce energy consumption. Its 256 KB of Flash is sufficient for compact application firmware, and the 64-pin LQFP package provides accessible pins for sensors, displays and buttons. Battery-life calculations should include sensor current, radio activity, regulator quiescent current and the instrument's sampling interval.
Recommended
Compact Audio Processing Controller
The STM32L451RCT6 can serve as a compact digital controller in audio and acoustic equipment, especially when the design requires local filtering, configuration and communication. Its 80 MHz Cortex-M4 core includes floating-point capability, which is useful for control and signal-processing routines, while the DFSDM peripheral supports compatible sigma-delta audio converters. The 256 KB Flash budget fits moderate firmware workloads, and the 64-pin package simplifies connection to converters, amplifiers and digital interfaces. Analog and digital return paths should be separated carefully to prevent converter switching activity from degrading signal quality.
Recommended
Recommended Products Summary
Engineering reference data for STM32L451RCT6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L451RCT3 | STM32L452RCT6 | STM32L451RET6 | STM32L462RET6TR |
|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) |
| Processor Core | Arm Cortex-M4 with FPU | Arm Cortex-M4 | Arm Cortex-M4 | Arm Cortex-M4 | Arm Cortex-M4 |
| Maximum CPU Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Architecture | 32-bit ARM RISC | 32-bit ARM RISC | 32-bit ARM RISC | 32-bit ARM RISC | 32-bit ARM RISC |
Key Differentiators
- Uses the same 256 KB memory class as the RCT3 candidate (vs STM32L451RCT3)
- Provides more Flash capacity than the target without changing the 64-LQFP outline (vs STM32L451RET6)
- Maintains an 80 MHz Cortex-M4 control point across the same-footprint family options (vs STM32L462RET6TR)
Design Notes
Plan the supply and decoupling network around every supply pin identified in the manufacturer pin table. Place the closest bypass capacitor directly between each applicable supply and ground connection, then route the remaining decoupling to the device without long loops through analog or switching sections. Enable and boot pins should not be left floating. If the board relies on low-power modes, confirm that external pull resistors, transceivers and sensors do not prevent the complete system from entering the intended state.
Use a ground plane as the primary return path and keep the analog reference, DFSDM inputs and communication interfaces physically separated from switching nodes. The 64-LQFP package has a relatively accessible lead pitch, but signal ordering and pin multiplexing still determine whether a short analog path is possible. Review the alternate-function table for every used pin and preserve the required analog-capacitor placement close to the MCU. Do not assign board interfaces until the exact pinout and boot options are confirmed.
Treat the order-code suffix as part of the device specification rather than a cosmetic label. Before replacing STM32L451RCT6 with STM32L451RCT3, STM32L452RCT6, STM32L451RET6 or STM32L462RET6TR, compare the exact pin table, temperature grade, memory organization, peripheral set and boot behavior. A matching LQFP outline alone does not guarantee that all firmware, interrupts, pins and analog functions remain unchanged. Validate the candidate using the manufacturer's device documentation and a representative hardware test.
The 80 MHz Cortex-M4 core and active peripherals determine actual switching activity and dissipation; the LQFP package provides a practical thermal path, but the exact junction temperature cannot be calculated without the clock configuration, supply voltage, duty cycle and board construction. Keep the MCU's exposed thermal relationship and ground connections in mind during layout, avoid enclosing the device with heat-producing regulators where practical, and measure the highest expected operating condition. Validate against the manufacturer's electrical limits.
Compliance Information
No definitive compliance statement or qualification status was identified for the exact STM32L451RCT6 order code.