STMicroelectronics STM32L151RBH6ATR

Overview

STM32L151RBH6ATR 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, up to 24 channels), and dual 12-bit DACs - deployed in battery-powered IoT sensors and portable medical monitors requiring sub-µA standby current and RTC-backed wake-up.

For engineers reviewing the STM32L151RBH6ATR datasheet, STM32L151RBH6ATR pinout, STM32L151RBH6ATR application, or STM32L151RBH6ATR equivalent, key selection criteria include verified ultra-low-power mode timing (0.28 µA Standby, <8 µs wakeup), USB 2.0 full-speed support with internal 48 MHz PLL, and 73 5V-tolerant I/Os mappable to 16 external interrupt vectors.

Technical Context

The device implements a Cortex-M3 core with MPU, operating from 32 kHz to 32 MHz, delivering 1.25 DMIPS/MHz and supporting dynamic voltage scaling across five low-power modes. Its clock system integrates 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 USB-capable PLL.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and LCD driver (excluded in STM32L151x6/8/B-A variants). Memory protection, ECC on Flash and EEPROM, and 96-bit unique ID ensure robust embedded operation.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin low-profile quad flat package with exposed thermal pad (mechanical drawing compliant with Table 65, DocID024330 Rev 5).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151RBH6ATR, STM32L431CBU6 trades EEPROM and ultra-low standby for FPU-enabled processing, while EFM32PG12B500F1024GL125 offers deeper sleep and larger memory but omits USB - making STM32L151RBH6ATR optimal for USB-connected, EEPROM-dependent, sub-µA standby designs.

Availability

STM32L151RBH6ATR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic instruments requiring stable component supply across multi-year production cycles.

Supply support for STM32L151RBH6ATR 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, emphasizing sub-µA standby operation, integrated EEPROM, and robust analog peripherals for battery-constrained edge devices - balancing performance, longevity, and system integration.

FAQ

What is the maximum operating frequency and core type of STM32L151RBH6ATR?

The STM32L151RBH6ATR features an ARM Cortex-M3 core rated for up to 32 MHz operation. It delivers 1.25 DMIPS/MHz (Dhrystone 2.1) and includes a Memory Protection Unit (MPU) for secure memory partitioning. The core supports Thumb-2 instruction set and operates across the full 1.65–3.6 V supply range with dynamic voltage scaling to optimize power versus performance.

Does STM32L151RBH6ATR include hardware error correction for memory?

Yes, STM32L151RBH6ATR implements hardware ECC on both its 128 KB Flash memory and 4 KB true EEPROM. This detects and corrects single-bit errors and detects double-bit errors in real time, ensuring data integrity for firmware storage and critical configuration parameters without software overhead or external components.

Can STM32L151RBH6ATR operate in USB device mode without external components?

Yes - the device integrates a full-speed USB 2.0 transceiver with internal 1.5 kΩ pull-up resistor on USB_DP, eliminating the need for external PHY or pull-up resistors. It uses an internal 48 MHz PLL fed from the HSE or MSI clock source, enabling certified USB device functionality with only standard USB connector and ESD protection.

How many I/O pins are 5V tolerant and what is their interrupt capability?

STM32L151RBH6ATR provides 73 I/O pins with 5V tolerance across GPIO ports A–D and H. All 73 pins can be individually configured as inputs with interrupt capability, and up to 16 of them are mapped to external interrupt vectors (EXTI0–EXTI15 plus additional lines), supporting edge-triggered wake-up from all low-power modes.