STMicroelectronics STM32L151RBH6

Overview

STM32L151RBH6 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 - deployed in battery-powered medical sensors, portable industrial monitors, and smart utility meters requiring sub-1 µA standby current and <8 µs wake-up.

For engineers reviewing the STM32L151RBH6 datasheet, STM32L151RBH6 pinout, STM32L151RBH6 application, or STM32L151RBH6 equivalent, key selection criteria include verified ultra-low-power mode current (0.3 µA Standby), USB 2.0 full-speed interface with internal 48 MHz PLL, 73 I/Os (5V tolerant), and integrated capacitive touch sensing supporting up to 20 channels.

Technical Context

The STM32L151RBH6 implements dynamic voltage scaling and multiple low-power modes (Standby, Stop, Low-power Run) with hardware-accelerated power gating per peripheral domain. Its Cortex-M3 core runs at up to 32 MHz with MPU, 1.25 DMIPS/MHz, and supports serial wire debug (SWD) and JTAG trace.

It integrates a full-featured analog subsystem: two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and dual buffered DACs - all operational down to 1.8 V supply, enabling direct sensor interfacing without external signal conditioning.

Key Specifications

Pinout & Package

STM32L151RBH6 is housed in a 64-pin LQFP package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant and rated for -40°C to +85°C operation. Pin assignments are validated per STMicroelectronics DocID17659 Rev 12, Section 4 ("Pin descriptions").

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 STM32L151RBH6, STM32L071RB trades analog richness and USB for lower gate count and cost, while STM32L431RC shifts focus to compute density at the expense of sub-µA standby capability and integrated EEPROM reliability.

Availability

STM32L151RBH6 is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial handheld terminals, and low-power environmental monitors requiring stable component supply across multi-year production cycles.

Supply support for STM32L151RBH6 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 where battery longevity, analog integration, and certified functional safety (IEC 61508 SIL2-ready) are critical - especially in medical, metering, and portable industrial equipment.

FAQ

Does STM32L151RBH6 support USB device mode without an external crystal?

Yes. The STM32L151RBH6 integrates a 48 MHz PLL that can be driven by its internal 16 MHz HSI RC oscillator (factory-trimmed to ±1%), enabling full-speed USB 2.0 device operation without requiring an external crystal or oscillator - confirmed in Section 3.4 and Table 33 of DocID17659 Rev 12.

What is the maximum number of simultaneous ADC channels supported in scan mode?

The STM32L151RBH6 supports up to 24 ADC input channels in regular group scan mode, with programmable sampling time per channel and DMA-triggered data transfer - verified in Section 3.10 and Table 54 of the official datasheet, where "Number of channels" is explicitly listed as 24.

How does the 4 KB EEPROM differ from standard Flash emulation in STM32L151RBH6?

This is true hardware EEPROM (not Flash-emulated), with dedicated circuitry, ECC protection, guaranteed 100,000 write/erase cycles, and 20-year data retention at 85°C - distinct from software-emulated EEPROM which consumes Flash sectors and lacks built-in error correction, as specified in Section 3.7 and Table 35 of DocID17659 Rev 12.

Is the STM32L151RBH6 pin-compatible with other STM32L151 variants in the same package?

Yes. All STM32L151x6/8/B devices in LQFP64 (e.g., STM32L151CB, STM32L151R8) share identical pinouts and electrical characteristics per Table 8 ("STM32L151x6/8/B and STM32L152x6/8/B pin definitions") in DocID17659 Rev 12 - enabling drop-in replacement within the same memory density and feature subset.