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

STMicroelectronics STM32L151CBU6A

Name: STM32L151CBU6A
Brand: STMicroelectronics
SKU: STM32L151CBU6A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32L151CBU6A

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-UFQFN Exposed Pad

Datasheet:: STM32L151CBU6A.pdf

Description:: IC MCU 32BIT 128KB FLSH 48UFQFPN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM32L151CBU6A from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller with 128 KB Flash, 32 KB SRAM, 4 KB EEPROM, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs-designed for battery-powered IoT sensors, portable medical devices, and smart metering endpoints requiring sub-µA standby current and RTC retention.

For engineers reviewing the STM32L151CBU6A datasheet, STM32L151CBU6A pinout, STM32L151CBU6A application, or STM32L151CBU6A equivalent, key selection criteria include verified 0.28 µA Standby mode (3 wakeup pins), USB 2.0 full-speed support with internal 48 MHz PLL, and 73 I/Os (5V tolerant) mappable to 16 external interrupt vectors.

Technical Context

The device integrates a Cortex-M3 core running up to 32 MHz with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby). Its power architecture includes ultra-low-power BOR with 5 thresholds, programmable voltage detector (PVD), and multiple clock sources: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz).

Analog subsystem comprises two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT, and LCD driver (excluded in STM32L151x6/8/B-A variants). Communication interfaces include 1x USB 2.0, 3x USART (ISO 7816/IrDA), 2x SPI (16 Mbit/s), and 2x I²C (SMBus/PMBus).

Key Specifications

Parameter	Value and Actual Design Meaning
Core	ARM Cortex-M3, 32-bit, up to 32 MHz - delivers 1.25 DMIPS/MHz for deterministic real-time control in energy-constrained systems.
Memory	128 KB Flash with ECC + 32 KB SRAM + 4 KB true EEPROM with ECC - enables robust firmware storage, data logging, and parameter retention across power cycles.
Power Consumption	0.28 µA Standby (3 wakeup pins), 1.11 µA Standby+RTC, 0.44 µA Stop (16 wakeup lines) - extends coin-cell battery life to >10 years in always-on sensing nodes.
Analog Peripherals	12-bit ADC (1 Msps, 24 channels), 2×12-bit DACs with buffers, 2×ultra-low-power comparators - supports precision sensor signal acquisition and analog output without external components.
Timers & Connectivity	10 timers (6×16-bit GP, 2×basic, 2×WDT), 1×USB 2.0 FS, 3×USART, 2×SPI, 2×I²C - enables multi-protocol communication, PWM motor control, and secure firmware updates via bootloader.
I/O & Packaging	73 I/Os (5V tolerant), all mappable to 16 EXTI lines; UFBGA48 (7 × 7 mm, 0.5 mm pitch) - supports high-density PCB layouts with mixed-voltage interfacing.

Pinout & Package

STM32L151CBU6A is housed in a 48-pin Ultra Fine Pitch Ball Grid Array (UFBGA48) package measuring 7 × 7 mm with 0.5 mm ball pitch, optimized for compact wearable and portable designs requiring thermal efficiency and board space savings.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VDDA, VDDIO2	Power supply inputs	Separate analog/digital rails (1.65–3.6 V) enable noise isolation for ADC/DAC operation and flexible power domain partitioning.
VSS, VSSA	Ground references	Dedicated analog ground (VSSA) minimizes coupling noise into sensitive analog circuits during mixed-signal operation.
PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2	General-purpose I/Os	73 total GPIOs (5V tolerant on most), all configurable as EXTI sources - supports direct connection to industrial sensors, buttons, and displays without level shifters.
PA11/PA12	USB D+/D−	Dedicated full-speed USB 2.0 interface with internal transceivers - eliminates need for external PHY and reduces BOM cost in connected edge devices.
PC13–PC15	RTC oscillator pins	Support external 32.768 kHz crystal with calibration - ensures accurate timekeeping in metering and alarm applications over temperature range (−40°C to +105°C).

Key Features

Feature	Design Value
Ultra-low-power BOR	5 selectable brownout reset thresholds - allows precise supply monitoring across varying battery discharge curves without external supervisor ICs.
Pre-programmed bootloader	USART-based firmware update via UART pins - enables field firmware upgrades without JTAG/SWD debug hardware, reducing service logistics cost.
Capacitive sensing	Up to 20 channels supporting touchkey, linear, and rotary sensors - provides direct human-machine interface capability for medical and home automation panels.
DMA controller	7-channel peripheral-to-memory/mem-to-mem engine - offloads CPU during ADC sampling, USB transfers, and sensor data streaming to preserve low-power runtime.
CRC calculation unit	Hardware-accelerated cyclic redundancy check - ensures integrity of firmware images and EEPROM-stored configuration data in safety-critical applications.

Applications

Smart Utility Metering

Portable ECG Monitor

Use Scenario: Battery-operated electricity/water/gas meters with hourly consumption logging and RF transmission.

IC Role / Device Role / Timing Role: Main system controller managing ADC sampling of shunt/CT sensors, EEPROM data storage, RTC timestamping, and low-power wake-up for periodic transmission.

Use Value: 0.28 µA Standby current enables >15-year battery life using CR2032; integrated 4 KB EEPROM eliminates external nonvolatile memory for tariff tables and event logs.

Use Scenario: Handheld electrocardiogram (ECG) device acquiring biopotential signals at 250–1000 Hz with real-time display and Bluetooth upload.

IC Role / Device Role / Timing Role: Signal acquisition hub performing 12-bit ADC sampling (24-channel capable), digital filtering, LCD driving, and USB/USART data export.

Use Value: 12-bit ADC with 1 Msps and built-in VREFINT enables <1% gain error across temperature; 10.9 µA Low-power Run mode sustains continuous acquisition on single AAA cell.

Wireless Sensor Node

Industrial Temperature Logger

Use Scenario: LoRaWAN/NB-IoT node measuring ambient temperature, humidity, and motion in remote infrastructure monitoring.

IC Role / Device Role / Timing Role: Sensor fusion processor aggregating data from I²C sensors, executing wake-on-motion logic via comparators, and managing deep-sleep duty cycling.

Use Value: Dual ultra-low-power comparators with window mode detect threshold breaches without CPU wake-up; 1.38 µA Stop+RTC maintains time accuracy between transmissions.

Use Scenario: DIN-rail mounted logger recording temperature every 10 seconds for HVAC commissioning and cold-chain validation.

IC Role / Device Role / Timing Role: Precision measurement controller using internal temperature sensor and external thermistor inputs, storing calibrated readings in EEPROM with timestamps.

Use Value: Factory-calibrated temperature sensor (±1.5°C accuracy) and 4 KB EEPROM with ECC ensure traceable, tamper-resistant data logs compliant with ISO 17025 requirements.

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
STM32L431CBU6	ARM Cortex-M4F core, 80 MHz max, 200 µA/MHz Run, no EEPROM, 1 MB Flash option	Better floating-point performance for FFT-based vibration analysis; lacks EEPROM for parameter retention	Select when algorithmic complexity outweighs EEPROM dependency and higher active power is acceptable.
EFM32PG12B500F1024GL125	ARM Cortex-M4, 40 MHz, 1.4 µA EM4 Deep Sleep, 128 KB RAM, no USB, proprietary Simplicity Studio toolchain	Superior deep-sleep current for intermittent wake-up sensors; no native USB simplifies host interface but adds bridge IC cost	Choose for ultra-long-life battery applications where USB is unnecessary and ecosystem lock-in is acceptable.

Compared with STM32L151CBU6A, STM32L431CBU6 offers higher compute throughput at increased active power, while EFM32PG12B500F1024GL125 achieves lower deep-sleep current but sacrifices USB integration and EEPROM persistence-making STM32L151CBU6A optimal for USB-connected, data-logging edge nodes with strict EEPROM requirements.

Availability

STM32L151CBU6A is available at Aetrix Electronics and suitable for smart utility metering, portable medical diagnostics, and industrial temperature logging requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for STM32L151CBU6A 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, sensors, and automotive semiconductors since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust analog integration, and industrial-grade reliability across −40°C to +105°C operating ranges.

FAQ

What is the maximum operating frequency and core type of STM32L151CBU6A?

The STM32L151CBU6A features an ARM Cortex-M3 32-bit core with a maximum CPU frequency of 32 MHz. It delivers 1.25 DMIPS/MHz (Dhrystone 2.1) and includes a Memory Protection Unit (MPU) for secure task isolation. The core operates across the full 1.65–3.6 V supply range and supports dynamic voltage scaling to optimize power versus performance.

Does STM32L151CBU6A support USB connectivity without external components?

Yes, STM32L151CBU6A integrates a full-speed USB 2.0 transceiver with internal 48 MHz PLL clock generation, enabling direct USB device functionality using only PA11 (D−) and PA12 (D+) pins. No external PHY or crystal is required-only standard USB termination resistors and ESD protection diodes are needed for compliance.

How many I/O pins are 5V tolerant and what is their interrupt capability?

STM32L151CBU6A provides 73 general-purpose I/O pins, of which the majority are 5V tolerant (excluding analog inputs and USB pins). All 73 pins can be individually configured as inputs with pull-up/pull-down and mapped to any of 16 external interrupt vectors (EXTI lines), supporting flexible wake-up source assignment in low-power modes.

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

The STM32L151CBU6A includes 4 KB of true EEPROM with Error Correction Code (ECC), rated for 400,000 write/erase cycles and 20-year data retention at 85°C (per STMicroelectronics DocID024330 Rev 5, Section 6.3.37). This exceeds typical external serial EEPROM specifications and eliminates need for external nonvolatile memory in firmware parameter storage.

STM32L151CBU6A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 48-UFQFN Exposed Pad

Series:: STM32L1

Packaging:: Tray

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:: 128KB (128K 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:

STM32L151CBU6A FAQ

1.How can I place an order for STM32L151CBU6A through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32L151CBU6A 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 STM32L151CBU6A reliable?

The price and inventory of STM32L151CBU6A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L151CBU6A is usually 5 days.

3.What payment methods are accepted for STM32L151CBU6A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L151CBU6A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32L151CBU6A?

STM32L151CBU6A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32L151CBU6A 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 STM32L151CBU6A?

For technical support, including STM32L151CBU6A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L151CBU6A requirements.

6.How does Aetrix verify that STM32L151CBU6A is sourced from the original manufacturer or authorized distributors?

All STM32L151CBU6A 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 STM32L151CBU6A meets industry standards.

7.What is the process for return or replacement of STM32L151CBU6A?

All STM32L151CBU6A units undergo pre-shipment inspection (PSI). If there is an issue with STM32L151CBU6A, 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 STM32L151CBU6A part is unused and in its original packaging.

Return procedure for STM32L151CBU6A:

1.Submit a request within 90 days.

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

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