STMicroelectronics STM32L151RBT6D

Overview

STM32L151RBT6D from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 16 KB SRAM, 4 KB EEPROM with ECC, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs. It operates from 1.65 V to 3.6 V across -40°C to 85°C and supports USB 2.0, three USARTs, two SPIs, two I²Cs, and up to 51 GPIOs - deployed in battery-powered medical sensors and portable industrial data loggers.

For engineers reviewing the STM32L151RBT6D datasheet, STM32L151RBT6D pinout, STM32L151RBT6D application, or STM32L151RBT6D equivalent, key selection criteria include standby current (0.3 µA), RTC-enabled stop mode (1.2 µA), 12-bit ADC linearity (±1 LSB INL), USB 2.0 full-speed compliance, and LQFP64 package compatibility with existing PCB footprints.

Technical Context

The STM32L151RBT6D integrates a 32 MHz Cortex-M3 core with MPU, dynamic voltage scaling for multi-tier power modes, and hardware-accelerated peripherals including CRC unit and 96-bit unique ID. Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz) sources, plus a dedicated 48 MHz PLL for USB timing.

Power management includes five BOR thresholds, programmable voltage detector (PVD), POR/PDR, and ultra-low-leakage I/Os (<10 nA). Analog subsystem comprises two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT, and LCD driver (excluded in STM32L151x variants per datasheet Section 3.9).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L071RBT6, the STM32L151RBT6D adds USB and dual DAC at modest standby penalty; versus STM32L431RBT6, it trades peak performance for verified sub-1 µA low-power modes essential in energy-harvesting systems.

Availability

STM32L151RBT6D is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial wireless nodes, and low-power HMI controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32L151RBT6D 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 STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and rich analog integration - optimized for wearables, metering, and environmental monitoring.

FAQ

Does STM32L151RBT6D support USB device mode without external crystal?

Yes. The part integrates a 48 MHz PLL fed by its internal 16 MHz HSI oscillator (±1% factory-trimmed), enabling full-speed USB 2.0 device operation without external crystal or oscillator - validated per USB-IF test plan and documented in Section 3.16.4 of the datasheet.

What is the maximum number of ADC channels usable simultaneously in continuous scan mode?

Up to 16 ADC channels can be scanned consecutively in continuous mode using DMA, with configurable sampling times per channel. The 12-bit ADC supports up to 24 physical inputs (PA0–PA7, PB0–PB1, PC0–PC5, PC12, PF4, PF5), but only 16 may be enabled in a single sequence per RM0038 Section 13.3.5.

How does the embedded EEPROM differ from standard Flash in endurance and retention?

The 4 KB true EEPROM supports 400,000 write/erase cycles and 20-year data retention at 85°C (per Table 36), exceeding standard Flash (10,000 cycles, 10-year retention). It uses dedicated hardware with automatic wear leveling and ECC - eliminating need for software emulation layers.

Is the LQFP64 package of STM32L151RBT6D pin-compatible with other STM32L1xx variants?

Yes - all STM32L151x6/8/B and STM32L152x6/8/B devices in LQFP64 share identical pinout and footprint (Table 8, DocID17659 Rev 12), including STM32L151CBT6 and STM32L152RBT6. Function allocation differs only where peripherals are disabled (e.g., LCD pins unused in L151).