STMicroelectronics STM32L451RCT6

Overview

STM32L451RCT6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz, featuring 256 KB Flash, 64 KB SRAM, and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DAC channels, and hardware-accelerated cryptographic functions. It targets battery-powered IoT edge nodes requiring long runtime, secure firmware updates, and real-time sensor fusion in industrial monitoring systems.

For engineers reviewing the STM32L451RCT6 datasheet, STM32L451RCT6 pinout, STM32L451RCT6 application, or STM32L451RCT6 equivalent, key selection criteria include verified Stop 2 mode current (2.40 µA with RTC), LQFP64 package compatibility, 5 V-tolerant I/Os, CAN 2.0B interface support, and ART Accelerator™-enabled zero-wait-state Flash execution at 80 MHz.

Technical Context

The device implements an Adaptive Real-Time Accelerator (ART Accelerator™) that eliminates Flash wait states at 80 MHz, enabling deterministic 100 DMIPS performance. Its FlexPowerControl architecture supports seven low-power modes-including Shutdown (22 nA), Standby with RTC (375 nA), and Stop 2 (2.40 µA)-with sub-4 µs wake-up latency.

Core peripherals include a 12-bit ADC with hardware oversampling (up to 16-bit effective resolution), two ultra-low-power comparators, one operational amplifier with programmable gain, and a dedicated SAI for audio streaming. Clocking integrates dual PLLs, auto-trimmed MSI (±0.25%), and independent LSE/HSI sources for robust RTC and system timing.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant and ECOPACK2® certified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L432KCU6, the STM32L451RCT6 adds CAN 2.0B and SAI for industrial connectivity and audio, while STM32L552RET6 trades some analog richness for hardened security and deeper sleep efficiency-making each optimal for distinct design priorities: connectivity, size, or trust.

Availability

STM32L451RCT6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering endpoints, wearable health monitors, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L451RCT6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive semiconductors.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time responsiveness-optimized for IoT edge devices, portable medical equipment, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L451RCT6 operates at up to 80 MHz with ART Accelerator™ enabled. At this frequency, typical Run mode current is 84 µA/MHz (6.72 mA total) with code executing from Flash and peripherals active-measured under 3.3 V, 25 °C, with all clocks and I/Os enabled per DS11910 Rev 5 Table 27.

Does the device support hardware cryptographic acceleration?

No, the STM32L451RCT6 does not include dedicated cryptographic accelerators (e.g., AES, PKA, or HASH). It relies on software libraries for encryption; however, it features a true random number generator (RNG) and CRC calculation unit for basic security primitives and data integrity verification.

Which low-power mode retains RTC functionality while minimizing current draw?

Stop 2 mode retains full RTC operation-including calendar, alarms, and calibration-at 2.40 µA (typical), making it the lowest-power mode with functional RTC. Standby mode draws 375 nA but requires external circuitry to preserve RTC accuracy over temperature drift.

Is the LQFP64 package of STM32L451RCT6 pin-compatible with other STM32L4xx variants?

Yes-within the LQFP64 footprint, STM32L451RCT6 shares identical pin mapping with STM32L431RCT6 and STM32L476RGT6 for core power, reset, debug, and common peripheral signals (e.g., USART1, SPI1, I²C1). However, alternate function assignments for specific pins (e.g., SAI, CAN, DFSDM) differ and require schematic review per datasheet Table 16.