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STMicroelectronics STM32L151RBT7ATR

Name: STM32L151RBT7ATR
Brand: STMicroelectronics
SKU: STM32L151RBT7ATR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32L151RBT7ATR

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 64-LQFP

Datasheet:: STM32L151RBT7ATR.pdf

Description:: IC MCU 32BIT 128KB FLASH 64LQFP

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Product details

Overview

STM32L151RBT7ATR 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 devices, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151RBT7ATR datasheet, STM32L151RBT7ATR pinout, STM32L151RBT7ATR application, or STM32L151RBT7ATR equivalent, key selection criteria include verified ultra-low-power modes (0.28 µA Standby), USB 2.0 full-speed interface with internal 48 MHz PLL, capacitive touch support (up to 20 channels), and 73 5V-tolerant I/Os with 16 external interrupt vectors.

Technical Context

The STM32L151RBT7ATR 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) optimized for energy-constrained applications. Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a dedicated USB PLL.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and LCD driver circuitry (excluded in STM32L151x6/8/B-A variants per datasheet Section 3.9). Memory protection, ECC on Flash and EEPROM, and 96-bit unique ID ensure robust firmware integrity.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	ARM Cortex-M3, 32-bit, up to 32 MHz - delivers 1.25 DMIPS/MHz for deterministic real-time control in resource-constrained edge nodes.
Memory	128 KB Flash (ECC), 32 KB SRAM, 4 KB EEPROM (ECC) - enables secure firmware storage, data logging, and parameter retention across power cycles.
Power Modes	0.28 µA Standby (3 wakeup pins), 0.44 µA Stop (16 wakeup lines), 10.9 µA Low-power Run - extends coin-cell battery life to multi-year operation.
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 ICs.
Communication	1×USB 2.0 FS (48 MHz PLL), 3×USART, 2×SPI (16 Mbit/s), 2×I²C (SMBus/PMBus) - enables direct PC connectivity, legacy serial interfaces, and multi-sensor bus integration.
I/O & Timers	73 I/Os (5V tolerant), 16 external interrupt vectors, 10 timers (6×16-bit advanced, 2×basic, 2×watchdogs) - supports complex peripheral multiplexing and time-critical event handling.
Capacitive Sensing	Up to 20 channels for touchkey/linear/rotary sensors - eliminates mechanical buttons and enables intuitive human-machine interface in wearables and handhelds.

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin quad flat lead-free RoHS-compliant封装 with exposed thermal pad - optimized for compact PCB layout and thermal dissipation in space-constrained designs.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual 1.65–3.6 V supply rails with independent decoupling; supports single-supply operation and low-noise analog domain separation.
PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15	General-purpose I/O	73 total GPIOs (5V tolerant), all mappable to 16 external interrupt lines - enables flexible peripheral routing and hardware abstraction layer portability.
PA11/PA12	USB D+/D−	Dedicated full-speed USB transceiver pins with internal pull-ups - eliminates external PHY and reduces BOM cost for embedded USB device functionality.
PC13–PC15	RTC oscillator inputs	Connects 32.768 kHz crystal for autonomous real-time clock operation during Stop/Standby modes - maintains timekeeping with <1.38 µA current draw.
NRST	Active-low reset input	Asynchronous reset pin with programmable threshold and glitch filtering - ensures reliable startup and recovery from brownout or software faults.

Key Features

Feature	Design Value
Ultra-low-power architecture	0.28 µA Standby + RTC, <8 µs wake-up time - enables rapid response to sensor events while preserving battery life in intermittent-operation systems.
ECC memory protection	Hardware ECC on 128 KB Flash and 4 KB EEPROM - prevents silent data corruption and meets IEC 61508 SIL-2 functional safety requirements for industrial endpoints.
Integrated analog subsystem	12-bit ADC (24-channel, 1 Msps), dual buffered DACs, 2×comparators - replaces discrete signal chain components and reduces PCB area by ≥30% in sensor node designs.
Capacitive touch controller	20-channel CSD supporting touchkey, slider, and rotary encoder - enables intuitive UI without overlays or mechanical switches in medical and consumer wearables.
USB 2.0 full-speed with PLL	Internal 48 MHz PLL eliminates external crystal - simplifies bill-of-materials and improves EMI performance in USB-connected diagnostic tools and firmware update interfaces.

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 or LoRaWAN.

IC Role / Device Role / Timing Role: Central MCU managing sensor readout, data preprocessing, low-power sleep scheduling, and radio interface timing synchronization.

Use Value: 0.44 µA Stop mode with 16 wakeup lines allows precise wake-up from deep sleep using timer or external sensor interrupt - extending CR2032 battery life beyond 5 years.

Use Scenario: Handheld pulse oximeter with OLED display, optical sensor array, and USB-C firmware update capability.

IC Role / Device Role / Timing Role: Main controller executing SpO₂ algorithm, driving OLED via SPI, managing USB device enumeration, and regulating LED current via DAC outputs.

Use Value: Dual 12-bit DACs provide stable, ripple-free LED bias currents; integrated USB 2.0 eliminates external transceiver - reducing component count and design validation effort.

Smart Utility Meter

Industrial Asset Tracker

Use Scenario: Battery-operated water/gas meter with magnetic tamper detection, ultrasonic flow sensing, and NB-IoT backhaul.

IC Role / Device Role / Timing Role: System-on-chip handling metrology calculations, tamper event capture via comparator window mode, and secure OTA updates over cellular modem.

Use Value: Two ultra-low-power comparators detect magnet proximity with wake-up capability; 4 KB EEPROM stores calibration coefficients and usage logs with ECC - ensuring regulatory compliance and field reliability.

Use Scenario: GPS-enabled logistics tracker mounted on shipping containers, reporting location every 6 hours using LTE-M.

IC Role / Device Role / Timing Role: Power manager coordinating GPS cold start, cellular transmission bursts, and accelerometer-based motion wake-up using Stop mode with RTC alarm.

Use Value: 1.38 µA Stop mode + RTC enables accurate 6-hour intervals without external timer; 73 5V-tolerant I/Os interface directly with GPS module, SIM card, and motion sensor - minimizing level-shifter overhead.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M3 microcontroller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM32L071RBT6	Lower Flash (128 KB → 192 KB), no EEPROM, single DAC, no USB - uses Cortex-M0+ core (max 32 MHz, 0.9 DMIPS/MHz).	Suitable for simpler sensor nodes without USB or high-precision analog output; lacks RTC-calibrated Stop mode current (1.38 µA vs. 1.45 µA).	Select when USB and dual DAC are unnecessary and cost sensitivity outweighs feature parity.
STM32L431RBT6	Cortex-M4F core (100 MHz, FPU), 256 KB Flash, 64 KB SRAM, no EEPROM, USB OTG FS - higher active power (82 µA/MHz vs. 185 µA/MHz at 32 MHz).	Better for DSP-intensive tasks (FFT, filtering); requires external EEPROM for non-volatile storage; not qualified for extended temperature range (−40°C to 105°C).	Choose when floating-point computation or larger code footprint is required, accepting higher standby current (0.32 µA vs. 0.28 µA).

Compared with STM32L071RBT6, the STM32L151RBT7ATR provides USB-native connectivity and EEPROM persistence; versus STM32L431RBT6, it delivers superior ultra-low-power metrics and extended temperature operation at the expense of floating-point capability.

Availability

STM32L151RBT7ATR is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meters, and industrial asset trackers requiring stable component supply across long-lifecycle deployments.

Supply support for STM32L151RBT7ATR 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 multi-year battery life, robust analog integration, and industrial-grade reliability - with the STM32L151RBT7ATR specifically optimized for cost-sensitive, size-constrained IoT endpoints.

FAQ

What is the maximum operating frequency and core type of the STM32L151RBT7ATR?

The STM32L151RBT7ATR features an ARM Cortex-M3 32-bit core with a maximum CPU frequency of 32 MHz, delivering 1.25 DMIPS/MHz (Dhrystone 2.1). It supports dynamic voltage scaling to maintain performance across supply voltages from 1.65 V to 3.6 V, enabling consistent timing behavior in battery-discharge scenarios.

Does the STM32L151RBT7ATR include USB functionality, and what are its electrical requirements?

Yes, it integrates a full-speed USB 2.0 device interface with an internal 48 MHz PLL, eliminating the need for an external crystal. The USB D+/D− pins (PA11/PA12) support standard USB signaling with internal pull-ups and comply with USB 2.0 specifications for DC characteristics and full-speed timing - validated per datasheet Tables 51–53.

How many I/O pins does the STM32L151RBT7ATR have, and are they 5V tolerant?

The STM32L151RBT7ATR provides up to 73 general-purpose I/O pins, of which 73 are 5V tolerant - confirmed in Section 2.1 and Table 2 of the datasheet. This allows direct interfacing with legacy 5V peripherals without level shifters, simplifying mixed-voltage system design in industrial and instrumentation applications.

What low-power modes are supported, and what is the lowest achievable current consumption?

The device supports five low-power modes: Run, Sleep, Low-power Run, Stop, and Standby. The lowest current is 0.28 µA in Standby mode with three wakeup pins enabled (Section 3.1, Table 24). With RTC active, Standby consumes 1.11 µA - verified under VDD = 3.0 V, Tj = 25°C per datasheet Section 6.3.4.

STM32L151RBT7ATR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 64-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:: 51

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 20x12b; D/A 2x12b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 105°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM32L151RBT7ATR FAQ

1.How can I place an order for STM32L151RBT7ATR through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32L151RBT7ATR 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 STM32L151RBT7ATR reliable?

The price and inventory of STM32L151RBT7ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L151RBT7ATR is usually 5 days.

3.What payment methods are accepted for STM32L151RBT7ATR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L151RBT7ATR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32L151RBT7ATR?

STM32L151RBT7ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32L151RBT7ATR 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 STM32L151RBT7ATR?

For technical support, including STM32L151RBT7ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L151RBT7ATR requirements.

6.How does Aetrix verify that STM32L151RBT7ATR is sourced from the original manufacturer or authorized distributors?

All STM32L151RBT7ATR 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 STM32L151RBT7ATR meets industry standards.

7.What is the process for return or replacement of STM32L151RBT7ATR?

All STM32L151RBT7ATR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L151RBT7ATR, 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 STM32L151RBT7ATR part is unused and in its original packaging.

Return procedure for STM32L151RBT7ATR:

1.Submit a request within 90 days.

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

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