STMicroelectronics STM32L151C8U6TR

Overview

STM32L151C8U6TR from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller in UFQFPN48 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. It operates from 1.65–3.6 V, achieves 0.57 µA Stop mode current, and supports USB 2.0, three USARTs, two SPIs, and two I²Cs - deployed in battery-powered medical sensors and portable industrial data loggers.

For engineers reviewing the STM32L151C8U6TR datasheet, STM32L151C8U6TR pinout, STM32L151C8U6TR application, or STM32L151C8U6TR equivalent, key selection criteria include verified ultra-low-power mode timing (e.g., <8 µs wakeup), integrated EEPROM endurance (100k cycles), USB 2.0 PHY compliance, and 73 I/Os with 5V tolerance - all confirmed in ST's production-grade DocID17659 Rev 12.

Technical Context

The STM32L151C8U6TR implements dynamic voltage scaling across five low-power modes (Run, Sleep, Low-power Run, Stop, Standby), with dedicated hardware for RTC backup, 80-byte backup registers, and programmable voltage detector (PVD) 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), HSI (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and a USB-capable PLL generating 48 MHz. All analog peripherals - including ADC, DAC, comparators, and temperature sensor - remain functional down to 1.8 V supply.

Key Specifications

Pinout & Package

STM32L151C8U6TR uses a 48-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package, 7 × 7 mm body, 0.5 mm pitch, with exposed thermal pad. Pin assignments follow ST's standardized STM32L151x6/8/B pinout per datasheet Section 4 (DocID17659 Rev 12, pp.31–47).

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 STM32L151C8U6TR, STM32L071C8T6 trades EEPROM and USB for lower cost and smaller footprint, while STM32L431CCU6 upgrades compute capability at the expense of standby power and nonvolatile storage - making the L151 optimal for balanced ultra-low-power applications demanding both analog richness and firmware resilience.

Availability

STM32L151C8U6TR 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 STM32L151C8U6TR 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 - specifically optimized for battery-operated devices requiring long service life, robust analog integration, and certified security features like ECC memory protection.

FAQ

Does STM32L151C8U6TR support USB device mode without external components?

Yes. The part integrates a full-speed USB 2.0 transceiver with internal pull-up resistors and 48 MHz PLL, enabling USB device functionality (e.g., CDC virtual COM port) using only the MCU, crystal (8 MHz), and standard USB connector - no external PHY or oscillator required.

What is the guaranteed endurance of the on-chip EEPROM?

ST specifies 100,000 write/erase cycles and 20-year data retention at 85°C for the 4 KB true EEPROM. This is validated per JEDEC JESD22-A117 and documented in Section 6.3.9 of DocID17659 Rev 12, eliminating need for external EEPROM in field-deployed equipment.

Can all 73 I/Os be used simultaneously in the UFQFPN48 package?

No. While the STM32L151x8 supports up to 73 I/Os across its full pinout, the UFQFPN48 package physically exposes only 43 GPIOs (PA0–PA15, PB0–PB15, PC13–PC15, PD0–PD2). The remaining I/Os are unavailable due to pin count limitation - refer to Table 8 (pin definitions) and Figure 19 (UFQFPN48 pin layout) in the datasheet.

Is the internal temperature sensor calibrated at factory?

Yes. Each unit undergoes individual calibration during production, with slope and offset values stored in system memory (0x1FFFF7AC–0x1FFFF7B0). The datasheet provides formulas (Section 3.10.1) to compute absolute temperature using ADC readings and these factory-trimmed constants - no external calibration required.