STMicroelectronics STM32L151C8T6

Overview

STM32L151C8T6 from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller in LQFP48 package, 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 and portable industrial data loggers requiring sub-1 µA standby current and <8 µs wake-up.

For engineers reviewing the STM32L151C8T6 datasheet, STM32L151C8T6 pinout, STM32L151C8T6 application, or STM32L151C8T6 equivalent, key selection criteria include verified ultra-low-power mode sequencing (0.3 µA Standby, 0.57 µA Stop), USB 2.0 full-speed interface timing compliance, and LCD driver exclusion per device variant (not present in STM32L151x6/8/B series).

Technical Context

The STM32L151C8T6 implements dynamic voltage scaling across five low-power modes (Run, Sleep, Low-power Run, Stop, Standby), with dedicated hardware for real-time clock calibration, programmable voltage detector (PVD), and brownout reset (BOR) with five thresholds. Its memory protection unit (MPU) enforces privilege-level access to Flash, SRAM, and peripherals.

Clock architecture integrates six sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and PLL (for CPU and USB 48 MHz). All 48 pins support remappable alternate functions via AFIO, with 73 I/Os 5V-tolerant on larger packages - but only 37 GPIOs available in LQFP48 configuration.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad; 48-pin quad flat layout optimized for low-cost PCB routing and thermal dissipation in compact enclosures.

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 STM32L151C8T6, STM32L051K8U6 reduces cost and standby current but sacrifices USB and analog output capability, while STM32L431CCU6 upgrades compute performance and memory at the expense of EEPROM integration and ultra-low-power analog features.

Availability

STM32L151C8T6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable gas detectors requiring stable component supply across multi-year production cycles.

Supply support for STM32L151C8T6 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 sensors, and automotive semiconductors since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust analog integration, and certified security features - optimized for medical, metering, and portable industrial equipment.

FAQ

Does STM32L151C8T6 include an integrated LCD controller?

No. The STM32L151C8T6 belongs to the STM32L151x6/8/B subfamily, which explicitly excludes the LCD controller - that feature is reserved for STM32L152xx variants only. This omission reduces die size and power consumption for applications not requiring segment-based displays.

What is the maximum allowed operating temperature for STM32L151C8T6?

The STM32L151C8T6 is rated for industrial temperature range: –40°C to +85°C ambient. It does not support the extended +105°C grade offered in some STM32L152xx variants, making thermal derating essential in enclosed high-temperature enclosures.

Can the internal 16 MHz RC oscillator be used for USB timing without an external crystal?

No. USB 2.0 full-speed compliance requires ±0.25% clock accuracy; the internal HSI (±1%) fails this spec. The device must use either the 48 MHz PLL locked to an external 8/12/16 MHz crystal or the crystal-less USB mode synchronized to SOF packets - both validated in ST Application Note AN4185.

How many GPIO pins support external interrupt capability in LQFP48 package?

All 37 GPIOs in the LQFP48 variant (PA0–PA15, PB0–PB15, PC13–PC15, PD2) can be configured as external interrupt sources via EXTI lines. Each pin maps to one of 23 EXTI channels, with multiple pins shareable per channel (e.g., PA0, PB0, PC0 → EXTI0).