STMicroelectronics STM32L151RCT6TR

Overview

STM32L151RCT6TR 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, 12-bit ADC (1 Msps, 25 channels), and dual 12-bit DACs - deployed in battery-powered medical sensors, portable industrial loggers, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151RCT6TR datasheet, STM32L151RCT6TR pinout, STM32L151RCT6TR application, or STM32L151RCT6TR equivalent, key selection criteria include verified 0.29 µA Standby current (3 wakeup pins), USB 2.0 full-speed support with internal 48 MHz PLL, LCD driver capability (excluded in RCT6 variant), and 70 I/Os with 5V tolerance - all validated for -40 °C to +105 °C operation.

Technical Context

The device implements dynamic voltage scaling across six low-power modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby), with hardware-accelerated power state transitions and dedicated wakeup lines (16 in Stop mode, 3 in Standby). Its memory subsystem integrates ECC on both Flash and EEPROM, enabling robust data retention in harsh environments.

Clock architecture combines five independent sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), with a programmable PLL supporting CPU and USB clock generation - all managed via RCC registers with fail-safe oscillator switching.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with 64 leads; RoHS-compliant, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151RCT6TR, the STM32L431RCT6 trades EEPROM and ultra-low standby for FPU-enabled processing, while the EFM32PG12B500F1024GL125 sacrifices USB and nonvolatile storage to achieve lower system BOM cost in RF-sensor applications.

Availability

STM32L151RCT6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable data loggers requiring stable component supply across extended product lifecycles.

Supply support for STM32L151RCT6TR 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.

This part belongs to the STM32L1x ultra-low-power MCU product line, engineered specifically for energy-constrained applications demanding multi-year battery life, robust analog integration, and industrial-grade reliability from -40 °C to +105 °C.

FAQ

Does STM32L151RCT6TR support USB device functionality without external components?

Yes. The device integrates a full-speed USB 2.0 transceiver with internal pull-up resistors on PA11/PA12, enabling direct connection to a USB host without external PHY or termination resistors. The internal 48 MHz PLL provides the required clock, and the pre-programmed bootloader supports USB-based firmware updates out of reset.

What is the maximum number of I/O pins that can be used as 5V-tolerant inputs?

70 I/O pins are 5V tolerant, covering all GPIOs except those dedicated to analog functions (e.g., ADC inputs, DAC outputs, op-amp terminals) and USB D+/D−. This is confirmed in Section 3.6 (GPIOs) and Table 43 (I/O static characteristics) of the datasheet, with V_IH = 5.5 V max and V_IL = -0.3 V min.

How does the 8 KB EEPROM differ from standard Flash memory in this MCU?

The 8 KB EEPROM is a separate, dedicated memory block with ECC protection and byte-level erase/write capability - unlike Flash, which requires page erasure. It supports 400 k write/erase cycles and 20-year data retention at 55 °C, making it suitable for storing calibration data, configuration parameters, and event logs without wearing out main program Flash.

Is the LCD driver functional on the STM32L151RCT6TR package?

No. The RCT6 suffix denotes the LQFP64 package variant, which excludes the LCD controller peripheral per Table 1 (Device summary) and Section 3.9 (LCD) of the datasheet. LCD functionality is only available on STM32L151xC and STM32L151xV devices in LQFP100 or UFBGA100 packages.