STMicroelectronics STM32L151RBT6TR

Overview

STM32L151RBT6TR from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller in LQFP64 package, featuring 128 KB Flash, 16 KB SRAM, 4 KB EEPROM with ECC, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered medical sensors and portable industrial data loggers requiring sub-1 µA standby current and RTC retention.

For engineers reviewing the STM32L151RBT6TR datasheet, STM32L151RBT6TR pinout, STM32L151RBT6TR application, or STM32L151RBT6TR equivalent, key selection criteria include verified 0.9 µA Standby+RTC current, USB 2.0 full-speed interface with internal 48 MHz PLL, 73 5V-tolerant I/Os mappable to 16 EXTI lines, and support for capacitive touch sensing across up to 20 channels.

Technical Context

The device implements dynamic voltage scaling with three power modes (Ultralow-power, Low-power, and Main regulator) enabling precise trade-offs between performance (up to 32 MHz) and current consumption (as low as 0.3 µA in Standby). Its memory protection unit (MPU) enforces privilege-level access control across Flash, SRAM, and peripherals.

Clock architecture integrates six independent sources: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and a programmable PLL supporting CPU and USB clock domains - all managed via RCC registers with automatic fallback and calibration.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M3 microcontroller applications.

Compared with STM32L071RBT6, the STM32L151RBT6TR adds USB 2.0 FS and true EEPROM but trades off some active efficiency; versus STM32L431RBT6, it offers superior low-power metrics and EEPROM persistence at the expense of FPU and higher clock speed.

Availability

STM32L151RBT6TR is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial handheld terminals, and environmental data loggers requiring stable component supply across multi-year production cycles.

Supply support for STM32L151RBT6TR 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 sensors, and automotive-grade components since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust analog integration, and industrial-grade reliability - optimized for wearables, metering, and IoT edge nodes operating from coin cells or energy harvesters.

FAQ

What is the maximum operating frequency and corresponding power supply requirement?

The STM32L151RBT6TR achieves 32 MHz maximum CPU frequency only when VDD ≥ 2.4 V and Dynamic Voltage Scaling (DVS) is set to Range 1. At lower supply voltages (1.65–2.39 V), the max frequency drops to 16 MHz (Range 2) or 4 MHz (Range 3) to maintain stability and minimize leakage current.

Does this MCU support hardware encryption or secure boot features?

No. The STM32L151RBT6TR does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-implemented algorithms and external secure elements; later series like STM32L4+ or STM32H5 add these features.

Can the internal 4 KB EEPROM be used for storing calibration coefficients with guaranteed endurance?

Yes. The embedded EEPROM supports 100,000 write/erase cycles and 20-year data retention at 55°C, with built-in ECC correcting single-bit errors - validated per ST's characterization data (DocID17659 Rev 12, Table 36).

Is the USB interface fully self-contained, or does it require an external crystal?

The USB 2.0 Full-Speed interface is fully self-contained: it uses the internal 48 MHz PLL fed by the HSE or MSI oscillator, eliminating the need for an external 48 MHz crystal. Only the standard USB D+/D− pins and 1.5 kΩ pull-up resistor (integrated) are required.