STM32L151R8T6ATR - 64KB Flash Cortex-M3 MCU | STMicroelectronics
部品番号: STM32L151R8T6ATR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 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 概要
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.
ドロップイン代替品: STM32L151R8T6ATR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
STM32L152R8T6ATR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
STM32L151R8T6A
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
STM32L052R8T6
✅ ドロップイン📋 参考代替品（カタログ未掲載）
GD32F303RCT6
✅ ドロップイン📋 参考代替品（カタログ未掲載）
STM32L151R8T6ATR 最大定格＆電気的特性
| Core | ARM Cortex-M3 |
| Bit Width | 32-bit |
| 最大クロック周波数 | 32 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| SRAM | 10 KB |
| Supply Voltage Range | 1.8 V to 3.6 V |
| パッケージ | 64-LQFP (10x10x1.4 mm) |
| 実装タイプ | Surface Mount |
| 動作温度 | -40C to +85C |
| ADC | 12-bit (per datasheet) |
| Connectivity | I2C, SPI, USART, USB |
| RoHS ステータス | Compliant (per distributor listing) |
STM32L151R8T6ATR ピン構成
| ピン 1 | PB2 — GPIO B2 / BOOT1 (boot mode select) |
| ピン 2 | PE0 — GPIO E0 (only on 100-pin, NC on 64-pin per datasheet) |
| ピン 3 | PE1 — GPIO E1 (only on 100-pin, NC on 64-pin per datasheet) |
| ピン 4 | PE2 — GPIO E2 / TRACECK |
| ピン 5 | PE3 — GPIO E3 / TRACED0 |
| ピン 6 | PE4 — GPIO E4 / TRACED1 |
| ピン 7 | PE5 — GPIO E5 / TRACED2 |
| ピン 8 | PE6 — GPIO E6 / TRACED3 |
| ピン 9 | VBAT — Backup battery supply input |
| ピン 10 | PC13 — GPIO C13 / RTC tamper |
| ピン 11 | PC14 — GPIO C14 / OSC32_IN |
| ピン 12 | PC15 — GPIO C15 / OSC32_OUT |
| ピン 13 | VSS — Digital ground |
| ピン 14 | VDD — Digital supply (1.8-3.6 V) |
| ピン 15 | OSC_IN — External 32 kHz crystal or HSE oscillator in |
| ピン 16 | OSC_OUT — External 32 kHz crystal or HSE oscillator out |
| ピン 17 | NRST — Reset input, active low |
| ピン 18 | VREF+ — ADC reference voltage (VDDA on this device) |
| ピン 19 | VDDA — Analog supply (1.8-3.6 V) |
| ピン 20 | PA0 — GPIO A0 / WKUP1 (wakeup from Standby) |
主な用途
STM32L151R8T6ATR の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: STM32L151R8T6ATR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- 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)
設計ノート
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.
コンプライアンス情報
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.
