STMicroelectronics STM32L431CCU6TR

Overview

STM32L431CCU6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 256 KB Flash, 64 KB SRAM, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DACs, op-amp with PGA, and two ultra-low-power comparators. It targets battery-powered IoT sensors, portable medical devices, and energy-harvesting edge nodes requiring sub-µA standby operation and RTC-backed data retention.

For engineers reviewing the STM32L431CCU6TR datasheet, STM32L431CCU6TR pinout, STM32L431CCU6TR application, or STM32L431CCU6TR equivalent, key selection criteria include verified 28 nA Standby mode current, 4 µs Stop-mode wakeup latency, 1.71–3.6 V supply range, and UFBGA64 (5×5 mm) package compatibility with high I/O density and 5 V-tolerant pins.

Technical Context

This MCU implements FlexPowerControl architecture with five low-power modes (Shutdown, Standby, Stop 0/1/2), adaptive voltage scaling, and batch acquisition mode (BAM) for sensor hub duty-cycling. The ART Accelerator™ enables zero-wait-state execution from Flash at 80 MHz, while dual PLLs support independent clock domains for system, audio (SAI), and ADC subsystems.

The interconnect matrix decouples bus arbitration between CPU, DMA, and peripherals, enabling concurrent high-bandwidth transfers without contention. Analog peripherals operate from an independent supply domain, allowing precise 12-bit ADC measurements (200 µA/Msps) and low-noise DAC outputs even during dynamic CPU activity.

Key Specifications

Pinout & Package

UFBGA64 (5×5 mm, 0.5 mm pitch) package with 64 terminals, optimized for automated assembly and thermal performance in compact designs. Pinout validated per STMicroelectronics DS11453 Rev 3, Section 4 "Pinouts and pin description".

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L431CCU6TR, STM32L432KCU6 trades Flash capacity and interface count for lower cost and smaller footprint, while STM32L552RET6 adds security extensions and memory headroom at higher power and price - making the L431 optimal for balanced ultra-low-power general-purpose embedded control.

Availability

STM32L431CCU6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial predictive maintenance sensors, and energy-harvesting wireless nodes requiring stable component supply and long-term manufacturability.

Supply support for STM32L431CCU6TR 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time performance - specifically engineered for IoT edge nodes, portable medical devices, and smart metering platforms.

FAQ

What is the maximum operating temperature range for STM32L431CCU6TR?

The STM32L431CCU6TR is qualified for industrial operation from –40 °C to +85 °C, with extended variants supporting +105 °C and +125 °C. This rating is confirmed in DS11453 Rev 3, Section 6.3.1, and applies to all UFBGA64 package versions of the part.

Does STM32L431CCU6TR support hardware encryption acceleration?

No, the STM32L431CCU6TR does not include dedicated cryptographic accelerators (AES, PKA, HASH). It relies on software libraries for encryption; for hardware-accelerated crypto, ST recommends the STM32L5 or STM32U5 series, which integrate AES-256, PKA, and TRNG with TrustZone.

Can the internal 16 MHz RC oscillator (HSI16) be used as the system clock source without calibration?

Yes - the HSI16 is factory-trimmed to ±1% accuracy and can serve as the main system clock without external crystal or runtime calibration. Its stability over temperature and voltage is documented in DS11453 Rev 3, Table 48, making it suitable for cost-sensitive applications where precise timing is not critical.

How many GPIOs are available in the UFBGA64 package of STM32L431CCU6TR?

The UFBGA64 package provides 51 GPIOs, all configurable as general-purpose inputs/outputs with interrupt capability. This count excludes power, ground, reset, and debug pins, and is verified in DS11453 Rev 3, Table 15 "STM32L431xx pin definitions" for the UFBGA64 variant.