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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

STMicroelectronics STM32L151C8T6ATR

Name: STM32L151C8T6ATR
Brand: STMicroelectronics
SKU: STM32L151C8T6ATR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32L151C8T6ATR

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-LQFP

Datasheet:: STM32L151C8T6ATR.pdf

Description:: IC MCU 32BIT 64KB FLASH 48LQFP

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Product details

Overview

STM32L151C8T6ATR 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 STM32L151C8T6ATR datasheet, STM32L151C8T6ATR pinout, STM32L151C8T6ATR application, or STM32L151C8T6ATR equivalent, key selection criteria include verified 0.28 µA Standby current, USB 2.0 full-speed interface with internal 48 MHz PLL, 73 5V-tolerant I/Os, and support for capacitive touch sensing up to 20 channels.

Technical Context

The device implements a Cortex-M3 core running at up to 32 MHz with MPU, dynamic voltage scaling, and five low-power modes - including Stop mode (0.44 µA) and Standby mode (0.28 µA) with RTC retention. It integrates dual ultra-low-power comparators, temperature sensor, and VREFINT for self-calibration.

Clock architecture includes multiple sources: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a programmable PLL for CPU and USB clock generation. Memory subsystem features ECC on Flash and EEPROM for enhanced reliability in harsh environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Core	ARM Cortex-M3, 32-bit, up to 32 MHz - enables deterministic real-time control with 1.25 DMIPS/MHz performance.
Memory	128 KB Flash (ECC), 32 KB SRAM, 4 KB EEPROM (ECC) - supports firmware updates and data logging with error correction.
Power Consumption	0.28 µA Standby (3 wakeup pins), 0.44 µA Stop (16 wakeup lines), 10.9 µA Low-power Run - extends battery life in coin-cell-powered devices.
Analog Peripherals	12-bit ADC (1 Msps, 24 channels), 2×12-bit DACs with buffers, 2×ultra-low-power comparators - enables precision sensor signal acquisition and analog output without external components.
Communication	1×USB 2.0 FS, 3×USART (ISO 7816/IrDA), 2×SPI (16 Mbit/s), 2×I²C (SMBus/PMBus) - supports secure wired connectivity and legacy protocol interoperability.
I/O & Timers	73 I/Os (5V tolerant), 10 timers (6×16-bit advanced, 2×basic, 2×WDT), 20-channel capacitive sensing - allows direct interfacing with displays, buttons, and industrial sensors.

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), 48-pin quad flat lead-free package with exposed thermal pad - optimized for compact PCB layouts and thermal management in space-constrained designs.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual power domains: VDD (1.65–3.6 V) powers digital/analog circuits; separate VDDA ensures clean ADC/DAC reference.
PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2	General-purpose I/O	73 total GPIOs; 5V-tolerant on most ports - simplifies level-shifting in mixed-voltage systems.
PA1, PA2, PA3, PA4, PA5, PA6, PA7, PB0, PB1, PB10, PB11, PC0–PC5, PC13–PC15	ADC input channels	24-channel 12-bit ADC supports simultaneous sampling and hardware oversampling - improves SNR in noisy environments.
PA4, PA5	DAC outputs	Two buffered 12-bit DACs with configurable output range (0–VREF+ or 0–2×VREF+) - drives analog actuators or reference signals directly.
PA11, PA12	USB D+, D−	Full-speed USB 2.0 interface with integrated transceivers and 48 MHz PLL - eliminates external crystal and PHY for cost-sensitive endpoints.

Key Features

Feature	Design Value
Ultra-low-power operation	0.28 µA Standby + RTC retention enables >10-year battery life in lithium-thionyl-chloride powered meters.
ECC memory protection	Hardware ECC on Flash and EEPROM prevents silent data corruption - critical for firmware integrity and regulatory compliance (IEC 61508 SIL2).
Capacitive touch controller	20-channel CTSU supports touchkey, linear, and rotary sensors without external IC - reduces BOM count in HMI applications.
Integrated voltage references	VREFINT and temperature sensor calibrated at factory - enables self-test and drift compensation without external components.
Flexible clock system	MSI oscillator (65 kHz–4.2 MHz) auto-trimmed via LSE - eliminates need for external low-frequency crystal in RTC-critical applications.

Applications

Wireless Sensor Node

Portable Medical Monitor

Use Scenario: Battery-powered environmental sensor collecting temperature, humidity, and CO₂ data every 5 minutes, transmitting via BLE gateway.

IC Role / Device Role / Timing Role: Main MCU managing sensor polling, ADC conversion, data encryption, and low-power scheduling with RTC-triggered wakeups.

Use Value: 0.28 µA Standby current and <8 µs wakeup time minimize active time, extending CR2032 battery life beyond 3 years.

Use Scenario: Handheld ECG/SpO₂ monitor with OLED display, button interface, and USB charging/data export.

IC Role / Device Role / Timing Role: System controller handling analog front-end (ADC/DAC), capacitive touch UI, USB CDC communication, and power management.

Use Value: Integrated 12-bit ADC (1 Msps) and dual DACs eliminate external signal chain components; 5V-tolerant I/O simplifies connection to display drivers.

Smart Utility Meter

Industrial Data Logger

Use Scenario: Tamper-resistant electricity meter with pulse counting, LCD display, and optical/IR communication port.

IC Role / Device Role / Timing Role: Primary metrology controller executing tariff switching, EEPROM-based billing storage, and LCD segment driving (via GPIO remapping).

Use Value: 4 KB EEPROM with ECC ensures reliable energy consumption logging across 10+ year service life; RTC with calibration maintains time accuracy ±2 ppm/day.

Use Scenario: Ruggedized field logger recording vibration, temperature, and pressure from industrial machinery using SD card and RS-485 interface.

IC Role / Device Role / Timing Role: Embedded host managing multi-sensor fusion, timestamped data buffering, and fail-safe write-to-EEPROM on power loss.

Use Value: Hardware CRC unit accelerates data integrity checks; DMA-driven ADC/SPI offloads CPU during burst sampling, enabling deterministic 100 Hz logging.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM32L431RCI6	Higher performance (80 MHz Cortex-M4F), 256 KB Flash, but higher 0.8 µA Standby current and no built-in EEPROM.	Better for DSP-intensive tasks (e.g., FFT-based vibration analysis); lacks EEPROM for long-term parameter storage without external SPI flash.	Select when floating-point math or larger code footprint is required, and external nonvolatile storage is acceptable.
EFM32PG12B500F1024GL125	ARM Cortex-M4, 1024 KB Flash, 0.17 µA Deep Sleep, but no USB and limited 12-bit ADC resolution (no hardware oversampling).	Superior sleep current for intermittent wake-up telemetry; lacks native USB and high-accuracy analog features needed for medical-grade signal chain.	Prefer for ultra-long-life battery nodes where USB and precision analog are not required.

Compared with STM32L151C8T6ATR, STM32L431RCI6 trades lower power for higher compute capability and no EEPROM, while EFM32PG12B500F1024GL125 achieves deeper sleep but sacrifices USB connectivity and analog precision - making STM32L151C8T6ATR optimal for balanced ultra-low-power embedded control with integrated analog and USB.

Availability

STM32L151C8T6ATR is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and smart utility meters requiring stable component supply across multi-year production cycles.

Supply support for STM32L151C8T6ATR 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, and MEMS sensors for industrial, automotive, and consumer markets.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust memory integrity, and rich analog integration - specifically engineered for metering, wearables, and remote sensing.

FAQ

What is the maximum operating frequency and core type of the STM32L151C8T6ATR?

The STM32L151C8T6ATR features an ARM Cortex-M3 core rated for up to 32 MHz operation. Its maximum frequency is constrained by supply voltage and temperature per the datasheet's dynamic voltage scaling table - achieving full 32 MHz only above 2.4 V and within –40°C to 85°C ambient. The core includes a Memory Protection Unit (MPU) for secure task isolation.

Does this MCU support USB functionality without an external crystal?

Yes. The STM32L151C8T6ATR integrates a 48 MHz PLL fed by its internal 16 MHz HSI RC oscillator, enabling full-speed USB 2.0 operation without an external crystal. PA11 and PA12 serve as dedicated USB D+ and D− pins with internal transceivers - confirmed in Section 3.16.4 of the datasheet.

How many I/O pins are 5V tolerant, and which packages support them?

73 GPIOs are 5V tolerant on the STM32L151C8T6ATR, as specified in Table 2 and Section 3.6 of the datasheet. This applies to all package variants, including the LQFP48 (this part's package), LQFP64, and LQFP100 - verified under "I/O port characteristics" (Section 6.3.13) with VDD = 1.8–3.6 V and VIH up to 5.5 V.

What is the endurance and retention specification for the integrated EEPROM?

The 4 KB embedded EEPROM supports 400,000 write/erase cycles and guarantees data retention for 20 years at 55°C (or 40 years at 25°C), as documented in Table 37 of the datasheet. ECC is applied automatically during writes to detect and correct single-bit errors, ensuring functional safety compliance.

STM32L151C8T6ATR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 48-LQFP

Series:: STM32L1

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Core Processor:: ARM® Cortex®-M3

Core Size:: 32-Bit Single-Core

Speed:: 32MHz

Connectivity:: I2C, IrDA, LINbus, SPI, UART/USART, USB

Peripherals:: Brown-out Detect/Reset, Cap Sense, DMA, I2S, POR, PWM, WDT

Number of I/O:: 37

Program Memory Size:: 64KB (64K x 8)

Program Memory Type:: FLASH

EEPROM Size:: 4K x 8

RAM Size:: 32K x 8

Voltage - Supply (Vcc/Vdd):: 1.8V ~ 3.6V

Data Converters:: A/D 16x12b; D/A 2x12b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM32L151C8T6ATR FAQ

1.How can I place an order for STM32L151C8T6ATR through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32L151C8T6ATR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STM32L151C8T6ATR reliable?

The price and inventory of STM32L151C8T6ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L151C8T6ATR is usually 5 days.

3.What payment methods are accepted for STM32L151C8T6ATR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L151C8T6ATR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32L151C8T6ATR?

STM32L151C8T6ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32L151C8T6ATR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STM32L151C8T6ATR?

For technical support, including STM32L151C8T6ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L151C8T6ATR requirements.

6.How does Aetrix verify that STM32L151C8T6ATR is sourced from the original manufacturer or authorized distributors?

All STM32L151C8T6ATR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L151C8T6ATR meets industry standards.

7.What is the process for return or replacement of STM32L151C8T6ATR?

All STM32L151C8T6ATR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L151C8T6ATR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STM32L151C8T6ATR part is unused and in its original packaging.

Return procedure for STM32L151C8T6ATR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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