STMicroelectronics STM32L151RBH6A

Overview

STM32L151RBH6A 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 - deployed in battery-powered IoT sensor nodes, portable medical devices, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151RBH6A datasheet, STM32L151RBH6A pinout, STM32L151RBH6A application, or STM32L151RBH6A equivalent, key selection criteria include verified ultra-low-power mode current (0.28 µA Standby), USB 2.0 full-speed interface with internal 48 MHz PLL, LCD driver exclusion (per device variant), and 73 5V-tolerant I/Os mapped to 16 external interrupt vectors.

Technical Context

The STM32L151RBH6A integrates a Cortex-M3 core running up to 32 MHz with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby) governed by programmable voltage detector (PVD) and ultra-low-power BOR with five thresholds. Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz) sources, plus a dedicated USB PLL.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and 12-bit ADC with hardware oversampling - all functional down to 1.8 V supply. The 7-channel DMA controller supports peripheral-to-memory and memory-to-memory transfers without CPU intervention.

Key Specifications

Pinout & Package

LQFP64 package: 64-pin low-profile quad flat package, 10 × 10 mm body, 0.5 mm pitch, exposed pad (EP) for thermal dissipation, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151RBH6A, STM32L431RCY6TR offers higher performance at increased active power, while EFM32PG12B500F1024GL125 achieves lower deep-sleep current but sacrifices integrated USB and increases design complexity for connectivity.

Availability

STM32L151RBH6A is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L151RBH6A 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 demanding extended battery life, robust memory reliability, and rich analog integration - optimized for metering, healthcare, and industrial sensing.

FAQ

Does STM32L151RBH6A include an integrated LCD controller?

No. The STM32L151RBH6A excludes the LCD driver present in STM32L152 variants. This is explicitly stated in the datasheet Section 2.1 ("Device overview") and Table 2 ("Ultra-low-power STM32L151x6/8/B-A and STM32L152x6/8/B-A device features"), which lists "LCD" only under STM32L152 columns. The RBH6A variant is optimized for non-display applications to reduce cost and power.

What is the maximum allowed VDD voltage and operating temperature range?

The absolute maximum VDD rating is 4.0 V per Section 6.2 ("Absolute maximum ratings"), but the guaranteed operational range is 1.65 V to 3.6 V across –40°C to +105°C ambient temperature (Section 6.3.1). Operation above 3.6 V risks permanent damage; operation beyond 105°C violates industrial-grade thermal specifications and may cause timing violations or data retention loss.

How many I/O pins support 5V tolerance, and which ports are included?

73 I/O pins are 5V tolerant, covering all pins in GPIO ports A, B, C, D, and H except those designated for USB (PA11/PA12), oscillator (PH0/PH1), and BOOT0/NRST. This is confirmed in Section 2.1 ("Device overview") and electrical characteristics Table 43 ("I/O static characteristics"), which specifies V_IH = 5.5 V max for applicable pins.

Is the internal 16 MHz RC oscillator factory-trimmed, and what is its accuracy?

Yes, the HSI (High-Speed Internal) RC oscillator is factory-trimmed to ±1% accuracy at 25°C and 3.3 V, as specified in Section 6.3.7 ("Internal clock source characteristics"), Table 31. It supports automatic trimming via the RCC_HSICALIBRATION_DEFAULT value and can be calibrated further using the temperature sensor for drift compensation in wide-temperature applications.