STMicroelectronics STM32L151RCT6ATR

Overview

STM32L151RCT6ATR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M3 microcontroller featuring 256 KB Flash, 32 KB SRAM, 8 KB EEPROM with ECC, USB 2.0 interface, and 12-bit ADC (1 Msps, up to 40 channels). It operates from 1.65 V to 3.6 V across –40°C to 105°C and delivers 1.25 DMIPS/MHz performance. It targets battery-powered industrial sensors and portable medical devices requiring long runtime and integrated analog peripherals.

For engineers reviewing the STM32L151RCT6ATR datasheet, STM32L151RCT6ATR pinout, STM32L151RCT6ATR application, or STM32L151RCT6ATR equivalent, key selection criteria include standby current (305 nA), RTC-enabled stop mode (1.35 µA), 102 5V-tolerant I/Os, LCD driver exclusion (per device variant), and USB 2.0 support with internal 48 MHz PLL.

Technical Context

The STM32L151RCT6ATR implements dynamic voltage scaling and multiple low-power modes-standby (305 nA), stop + RTC (1.35 µA), and low-power run (11 µA)-with sub-8 µs wakeup. Its Cortex-M3 core supports MPU, Thumb-2 instruction set, and 32 MHz max clock via HSE/HSI/MSI/PLL sources.

Analog subsystem includes two rail-to-rail op-amps, two ultra-low-power comparators with window mode and wake-up capability, 12-bit dual DAC with output buffers, and temperature sensor with calibrated VREFINT. USB PHY is integrated with internal 48 MHz PLL; LCD controller is omitted in RCT6A package variants per DS10262 Rev 8 Section 2.1.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm) package with exposed thermal pad; RoHS-compliant, lead-free, and rated for industrial temperature range (–40°C to 105°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151RCT6ATR, STM32L431RCT6 trades EEPROM and analog richness for higher compute throughput and deeper sleep, while EFM32PG12B500F1024GL125 offers superior deep-sleep consistency but sacrifices USB integration and DAC functionality.

Availability

STM32L151RCT6ATR is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial wireless sensor nodes, and low-power HVAC controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32L151RCT6ATR 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, MEMS, and automotive semiconductors since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, integrated analog peripherals, and industrial-grade reliability - optimized for metering, wearables, and environmental monitoring.

FAQ

Does STM32L151RCT6ATR include an integrated LCD controller?

No. The STM32L151RCT6ATR belongs to the STM32L151xC/C-A subfamily, which explicitly excludes the LCD controller per ST's DS10262 Rev 8 Section 2.1 and Table 2. Only STM32L151xZC and STM32L152xC/C-A variants integrate the 8×40 segment LCD driver.

What is the maximum operating frequency and how is it achieved?

The STM32L151RCT6ATR achieves a maximum CPU frequency of 32 MHz using its internal 16 MHz HSI RC oscillator trimmed to ±1%, or via PLL multiplication of HSE (1–24 MHz) or MSI (65 kHz–4.2 MHz) sources. Dynamic voltage scaling adjusts core voltage to maintain stability across frequency and supply ranges.

How many 5V-tolerant I/Os does this MCU support?

It supports 102 5V-tolerant I/Os across its LQFP64 package. This is confirmed in DS10262 Rev 8 Section 2.2.2 ("Shared peripherals") and Section 3.6 ("GPIOs"), enabling direct interfacing with legacy 5V logic without level shifters in mixed-voltage systems.

Is the 8 KB EEPROM physically separate from Flash memory?

Yes. The 8 KB EEPROM is a dedicated, electrically erasable memory block with ECC protection, distinct from the 256 KB Flash. It supports byte-level writes, 100 k-cycle endurance, and 20-year data retention at 55°C - verified in DS10262 Rev 8 Section 3.7 and Table 35.