STM32L151R8T6ATR - 64KB Flash Cortex-M3 MCU | STMicroelectronics
N.º da peça: STM32L151R8T6ATR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.19 | $4,19 |
| 10 | $3.95 | $39,50 |
| 100 | $3.42 | $342,00 |
| 500 | $2.98 | $1.490,00 |
| 1.000 | $2.65 | $2.650,00 |
STM32L151R8T6ATR Visão geral
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and programmable peripherals. Ultra-low-power MCUs target battery-operated and energy-harvesting applications by combining a low-leakage process technology with multiple low-power modes (Sleep, Low-Power Sleep, Stop with RTC, Standby) that draw microamp-level quiescent current. Within the broader taxonomy, the STM32L1 sits below application processors (Cortex-A), above simple 8-bit MCUs, and is positioned for always-on sensing, metering, and human-interface designs where months-to-years battery life matter more than raw throughput.
Key specifications include 64KB Flash, 10KB SRAM (per the STM32L1 datasheet family), an internal 32kHz RTC oscillator, multiple timer/counter peripherals, I2C/SPI/USART/USB interfaces, 12-bit ADC, and a 1.8V-3.6V supply range. The device supports seven low-power modes with a typical Stop-mode current in the microamp range, enabling coin-cell powered designs.
The Cortex-M3 core implements the Thumb-2 instruction set, NVIC for interrupt handling, and is supported by ST's STM32Cube ecosystem including HAL, LL drivers, and STM32CubeIDE. Peripherals include up to 83 fast GPIOs, a real-time clock with calendar, brown-out reset, and a 12-bit ADC.
Typical applications include portable medical devices, industrial sensor nodes, smart meters, fitness wearables, and home automation controllers. The 64KB Flash / 10KB RAM balance targets small to mid-tier firmware stacks including BLE software stacks via external transceivers.
Design with adequate decoupling (100nF + 4.7uF) on each VDD pin and keep the NRST line short with a 100nF capacitor to ground. Use the STM32CubeMX configuration tool to assign pin alternate functions and validate clock tree settings.
This page synthesizes distributor pricing, lifecycle status, same-family alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Alternativas drop-in para STM32L151R8T6ATR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
STM32L152R8T6ATR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
STM32L151R8T6A
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
STM32L052R8T6
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
GD32F303RCT6
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
STM32L151R8T6ATR Classificações máximas e características elétricas
| Core | ARM Cortex-M3 |
| Bit Width | 32-bit |
| Frequência máxima de clock | 32 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| SRAM | 10 KB |
| Supply Voltage Range | 1.8 V to 3.6 V |
| Encapsulamento | 64-LQFP (10x10x1.4 mm) |
| Tipo de montagem | Surface Mount |
| Temperatura de operação | -40C to +85C |
| ADC | 12-bit (per datasheet) |
| Connectivity | I2C, SPI, USART, USB |
| Status RoHS | Compliant (per distributor listing) |
Configuração de pinos do STM32L151R8T6ATR
| Pino 1 | PB2 — GPIO B2 / BOOT1 (boot mode select) |
| Pino 2 | PE0 — GPIO E0 (only on 100-pin, NC on 64-pin per datasheet) |
| Pino 3 | PE1 — GPIO E1 (only on 100-pin, NC on 64-pin per datasheet) |
| Pino 4 | PE2 — GPIO E2 / TRACECK |
| Pino 5 | PE3 — GPIO E3 / TRACED0 |
| Pino 6 | PE4 — GPIO E4 / TRACED1 |
| Pino 7 | PE5 — GPIO E5 / TRACED2 |
| Pino 8 | PE6 — GPIO E6 / TRACED3 |
| Pino 9 | VBAT — Backup battery supply input |
| Pino 10 | PC13 — GPIO C13 / RTC tamper |
| Pino 11 | PC14 — GPIO C14 / OSC32_IN |
| Pino 12 | PC15 — GPIO C15 / OSC32_OUT |
| Pino 13 | VSS — Digital ground |
| Pino 14 | VDD — Digital supply (1.8-3.6 V) |
| Pino 15 | OSC_IN — External 32 kHz crystal or HSE oscillator in |
| Pino 16 | OSC_OUT — External 32 kHz crystal or HSE oscillator out |
| Pino 17 | NRST — Reset input, active low |
| Pino 18 | VREF+ — ADC reference voltage (VDDA on this device) |
| Pino 19 | VDDA — Analog supply (1.8-3.6 V) |
| Pino 20 | PA0 — GPIO A0 / WKUP1 (wakeup from Standby) |
Aplicações típicas
STM32L151R8T6ATR é adequado para 6 aplicaçãos: Portable Medical Monitoring Devices, Battery-Powered IoT Sensor Nodes, Smart Energy / Utility Metering, Wearable Fitness Trackers, Industrial Sensor / Field Transmitters, Home Automation / Connected Appliance HMI.
Portable Medical Monitoring Devices
The STM32L151R8T6ATR fits portable medical monitors because of its ultra-low-power Stop mode (microamp leakage) and 1.8-3.6 V supply, allowing blood-pressure cuffs, pulse oximeters, and glucose meters to run for months on a single battery. The 12-bit ADC provides adequate resolution for ECG front-ends while the Cortex-M3 at 32 MHz handles filtering without exhausting the 10 KB SRAM. Placed as the main MCU with a separate AFE like the ADS1291, it benefits from USB 2.0 Full-Speed for data offload. Compared to switching to a faster MCU, the L151's quiescent current (~1 uA in Stop with RTC) preserves battery life in sleep duty cycles that dominate portable-medical use cases.
Recomendado
Battery-Powered IoT Sensor Nodes
The STM32L151R8T6ATR's energy-efficient Cortex-M3 implementation, 64 KB Flash, and ultra-low-power Run mode (down to ~0.3 mA/MHz) make it ideal for LoRa/BLE sensor nodes that duty-cycle between sleep and transmit. With 10 KB SRAM the part can buffer sensor bursts and run a lightweight LoRaWAN stack alongside a small RTOS, while the 12-bit ADC captures analog sensor data. Pair it with an STM32WL or SX127x radio for sub-GHz links. The 64-LQFP gives enough GPIOs to handle SPI radio, I2C sensors, UART debug, and several GPIOs for status LEDs and user switches.
Recomendado
Smart Energy / Utility Metering
Smart electricity, water, and gas meters need accuracy over long lifetimes and robust tamper detection - both supported by the STM32L151R8T6ATR's RTC with calendar and tamper-resistant backup registers plus 1.8-3.6 V operation. The 64 KB Flash accommodates DLMS/COSEM or proprietary metering stacks and the 12-bit ADC interfaces with current shunts and voltage dividers with adequate dynamic range. Choose this part for residential smart meters where Sleep-mode current translates to 10+ year battery life; the LQFP-64 footprint supports expansion interfaces for wireless MBus, NB-IoT, or Wi-SUN modules.
Recomendado
Wearable Fitness Trackers
For fitness wearables like step counters, heart-rate straps, and wrist wearables, the STM32L151R8T6ATR offers a 32 MHz Cortex-M3 with sufficient performance to handle sensor fusion while keeping Stop-mode current low enough for coin-cell operation. The LQFP-64 small outline supports miniaturized PCB designs around 18x22 mm. Peripherals (I2C, SPI, USART) connect to optical heart-rate sensors and 6-axis IMUs; the 12-bit ADC digitizes battery voltage for fuel-gauge estimation. Designers upgrading memory can drop in the STM32L152R8T6 without PCB changes if adding display support.
Recomendado
Industrial Sensor / Field Transmitters
Industrial 4-20 mA loop-powered transmitters and wireless HART sensor nodes benefit from the STM32L151R8T6ATR's 1.8 V minimum supply (allowing operation directly from loop current with a low-drop shunt regulator) and 32 MHz processing headroom for IEC 61158-2 stack handling. The -40C to +85C industrial temperature range covers outdoor process plant environments. Place this MCU alongside a Zener-based safety barrier and a low-noise DAC for current-loop synthesis; the 64 KB Flash accommodates HART command sets plus a wirelessHART or IO-Link PHY driver.
Recomendado
Home Automation / Connected Appliance HMI
The STM32L151R8T6ATR serves as the central MCU of a smart thermostat, washing-machine HMI, or connected AC unit, with the 64-LQFP providing enough GPIOs to drive an LCD character or segment display, capacitive touch keypad, and several Triac or relay outputs. Its Cortex-M3 32 MHz handles UI rendering and fieldbus (Modbus, KNX, ZigBee gateway) via USART/SPI peripherals. Switch from L151 to L152 to add the integrated LCD driver (saves an external LCD controller), or pair the L151 with an off-chip driver for color TFTs. With Stop mode holding relay outputs latched at microamp currents, the appliance wall standby budget stays below 0.5 W.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para STM32L151R8T6ATR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | STM32L152R8T6ATR | STM32L052R8T6 | GD32F303RCT6 |
|---|---|---|---|---|
| Package | 64-LQFP (10x10) | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | GigaDevice |
| Core | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M0+ | ARM Cortex-M4 |
| Flash | 64 KB | 64 KB | 64 KB | 256 KB |
| SRAM | 10 KB | 10 KB | 8 KB | 48 KB |
| Maximum Clock | 32 MHz | 32 MHz | 32 MHz | 120 MHz |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.65 V to 3.6 V | 2.6 V to 3.6 V |
| USB | Yes (USB FS Device) | Yes | No | Yes (USB FS) |
| LCD Driver | No | Yes (8x40 segments) | No | No |
Principais diferenciais
- Ultra-low-power Cortex-M3 with USB 2.0 Full-Speed device (vs STM32L052R8T6)
- Same footprint upgrade path to LCD controller (vs STM32L152R8T6ATR)
- Strict pin-to-pin MCU compatibility for second sourcing (vs GD32F303RCT6)
Notas de projeto
Decouple every VDD pin with a 100 nF ceramic placed within 5 mm of the pin, plus a 4.7 uF bulk capacitor near the supply entry. For battery-powered designs, power the VBAT pin from a coin-cell backup through a low-leakage Schottky diode, and add a 1 uF capacitor on VBAT. The internal voltage regulator requires a 1 uF external capacitor on VCAP_1 and VCAP_2 pins when present in your package variant.
Keep the SWDIO/SWCLK traces (PA13/PA14) shorter than 50 mm and route them parallel with a ground guard to limit noise pickup. The HSE oscillator (if used) and the LSE 32.768 kHz crystal require tightly matched trace lengths within the oscillator block; place the load capacitors as close as possible to the OSC_IN/OSC_OUT or OSC32_IN/OSC32_OUT pins. Estimated: at 32 MHz the longest signal trace should be kept below 25 mm to control edge rates.
Do not leave NRST floating; the datasheet requires a 100 nF capacitor to ground plus an external pull-up of ~10 kohm to VDD. Ensure BOOT0 is held low at reset for normal Flash boot, or pulled high to enter the system memory bootloader for in-field programming via USART1 or USB. When entering Standby mode, the RTC must remain functional through VBAT; without a backup supply the RTC state is lost on VDD removal.
In the 64-LQFP package the junction-to-ambient thermal resistance theta_JA is approximately 40 C/W on a 4-layer JEDEC test board. Estimated: at full CPU load (32 MHz, all peripherals active) the device dissipates ~50 mW worst case, yielding a junction-temperature rise of 2-3 C above ambient - well within the -40 C to +85 C operating range. Switch to a QFN package variant if your design runs hot.
Informações de conformidade
RoHS and lead-free compliance confirmed via ST distributor listings and DigiKey product page. Not AEC-Q100 qualified - not recommended for automotive under-hood applications; choose STM32L151R8T6A 'automotive-grade' variant (AEC-Q100) if required.
