STMicroelectronics STM32L151RBT7A

Overview

STM32L151RBT7A from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 32 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 105°C and delivers 10.9 µA low-power run mode current, making it ideal for battery-powered IoT sensor nodes and portable medical devices requiring long runtime and mixed-signal precision.

For engineers reviewing the STM32L151RBT7A datasheet, STM32L151RBT7A pinout, STM32L151RBT7A application, or STM32L151RBT7A equivalent, key selection considerations include its ultra-low-power operating modes (0.28 µA standby), integrated analog peripherals (ADC/DAC/comparators), USB 2.0 interface with internal 48 MHz PLL, and 73 5V-tolerant GPIOs with capacitive touch support.

Technical Context

The STM32L151RBT7A integrates an ARM Cortex-M3 core running up to 32 MHz with MPU, supported by multiple clock sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz). Its power architecture includes dynamic voltage scaling, programmable voltage detector (PVD), and five low-power modes-Standby, Stop, Low-power Run, Sleep, and Run-with sub-µA retention states and <8 µs wake-up latency.

Analog subsystem integration includes a 12-bit ADC with hardware oversampling and offset calibration, two buffered 12-bit DACs, two ultra-low-power comparators with window mode and wake-up capability, and an internal temperature sensor with factory calibration. Memory subsystem features ECC-protected Flash and EEPROM, plus 80-byte backup registers for critical state retention during deep sleep.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin quad flat lead frame with exposed thermal pad - optimized for compact PCB layout, thermal dissipation in sealed enclosures, and compatibility with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151RBT7A, the STM32L431RCT6 trades EEPROM and ultra-low-power analog integration for higher compute throughput, while the EFM32PG12B500F1024GL125 achieves deeper sleep at the expense of USB and DAC functionality - making STM32L151RBT7A optimal for USB-enabled, mixed-signal, battery-constrained designs.

Availability

STM32L151RBT7A is available at Aetrix Electronics and suitable for smart utility metering, portable medical monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply and long-term manufacturability.

Supply support for STM32L151RBT7A 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 automotive semiconductors since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust analog integration, and industrial-grade reliability - with the STM32L151RBT7A specifically engineered for cost-sensitive, mixed-signal IoT endpoints.

FAQ

What is the maximum operating frequency of the STM32L151RBT7A?

The STM32L151RBT7A runs at up to 32 MHz using its internal 16 MHz HSI oscillator with PLL multiplication or external crystal sources. This frequency is fully supported across the entire 1.65–3.6 V supply range and –40°C to +105°C temperature range, with Dhrystone 2.1 benchmark performance of 1.25 DMIPS/MHz.

Does the STM32L151RBT7A support USB device functionality without external components?

Yes - it integrates a full-speed USB 2.0 device controller with internal 48 MHz PLL and differential transceiver. Only a single 1.5 kΩ pull-up resistor on USB_DP is required for enumeration; no external PHY, crystal, or voltage regulator is needed for basic HID or CDC implementations.

How does the 4 KB EEPROM differ from standard Flash memory in this MCU?

This 4 KB EEPROM is implemented as true EEPROM (not Flash-emulated) with ECC protection, endurance of 400k write/erase cycles, and data retention >20 years at 85°C. Unlike Flash, it supports byte-level writes and retains data during Stop/Standby modes without software emulation overhead.

Can the STM32L151RBT7A drive an LCD panel directly?

No - the STM32L151RBT7A excludes the integrated LCD controller present in STM32L152 variants. It supports segment-based LCDs only via GPIO bit-banging or external drivers; for direct LCD driving, the STM32L152RBT6 (same package) is the functionally equivalent alternative.