STMicroelectronics STM32L151C8T6A

Overview

STM32L151C8T6A 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 sensors, portable medical monitors, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151C8T6A datasheet, STM32L151C8T6A pinout, STM32L151C8T6A application, or STM32L151C8T6A equivalent, key selection criteria include verified ultra-low-power modes (0.28 µA Standby), integrated USB 2.0 PHY with internal 48 MHz PLL, 73 5V-tolerant I/Os with 16 external interrupt vectors, and hardware ECC for Flash and EEPROM.

Technical Context

The device implements a full ARM Cortex-M3 core with Memory Protection Unit (MPU), operating from 32 kHz to 32 MHz, delivering 1.25 DMIPS/MHz. It supports dynamic voltage scaling across five low-power modes - including Stop mode (0.44 µA) and Standby mode (0.28 µA) - with <8 µs wakeup latency from Low-power Run mode.

Clock architecture integrates six independent sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and a programmable PLL for CPU and USB clocks - enabling precise timing control without external components in most applications.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), 48-pin quad flat lead frame with exposed thermal pad - compatible with standard reflow profiles and cost-effective PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151C8T6A, the STM32L431RCI6 trades EEPROM and ultra-low standby for enhanced compute and memory, while the EFM32PG12B500F1024GL125 offers greater storage and lower deep-sleep current but lacks integrated USB and RTC-backed standby - making STM32L151C8T6A optimal for USB-connected, time-aware, EEPROM-dependent edge nodes.

Availability

STM32L151C8T6A is available at Aetrix Electronics and suitable for battery-powered IoT sensors, portable medical monitors, and smart utility meters requiring stable component supply and long-term lifecycle support.

Supply support for STM32L151C8T6A 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 - optimized for energy-constrained devices like wearables, smart meters, and wireless sensors where sub-µA standby and integrated analog peripherals reduce system-level power and component count.

FAQ

Does STM32L151C8T6A support USB device mode without external crystal?

Yes. The part integrates a full-speed USB 2.0 transceiver with an internal 48 MHz PLL driven by the HSI or MSI clock - eliminating the need for an external 48 MHz crystal. USB enumeration is fully functional in device mode using only the internal clock source, validated per USB-IF compliance tests in ST's reference designs.

What is the maximum number of I/Os usable simultaneously in LQFP48 package?

The LQFP48 variant provides 37 GPIOs (PA0–PA15, PB0–PB15, PC13–PC15, and PD0–PD2), all individually configurable as digital inputs/outputs, alternate functions, or analog inputs. All 37 support external interrupt capability, and 34 are 5V tolerant - confirmed in Table 9 (Pin Definitions) and Section 6.3.13 (I/O port characteristics) of the datasheet.

How does the 4 KB EEPROM differ from standard Flash in endurance and access?

This is true EEPROM emulated in dedicated Flash sectors with hardware ECC and wear-leveling logic. It guarantees 400,000 write/erase cycles and 20-year data retention at 85°C - versus 10,000 cycles for main Flash. Access is byte-addressable via standard store/load instructions, unlike Flash which requires page erase before write.

Can the STM32L151C8T6A operate reliably at 3.6 V and 105°C?

Yes. The device is fully specified for operation across 1.65–3.6 V supply and −40°C to +105°C ambient temperature, with all electrical parameters (including ADC accuracy, I/O leakage, and clock stability) guaranteed over this range per Section 6.3.1 (General operating conditions) and Table 14 in the datasheet.