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STMicroelectronics STM32L412TBY3TR
- Part No.:
- STM32L412TBY3TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 36-UFBGA, WLCSP
- Datasheet:
-
STM32L412TBY3TR.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 36WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,448
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Product details
Overview
STM32L412TBY3TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 128 KB flash, 40 KB SRAM, and integrated analog peripherals including dual 12-bit ADCs (5 Msps), one operational amplifier with PGA, and one ultra-low-power comparator - deployed in battery-powered IoT sensor nodes requiring sub-μA standby operation and fast wake-up.
For engineers reviewing the STM32L412TBY3TR datasheet, STM32L412TBY3TR pinout, STM32L412TBY3TR application, or STM32L412TBY3TR equivalent, key selection criteria include verified 245 nA Standby-with-RTC current, SMPS-compatible 1.71–3.6 V supply, LQFP32 package pin compatibility, and USB 2.0 full-speed crystal-less capability for space-constrained portable designs.
Technical Context
The device implements FlexPowerControl architecture with seven low-power modes, including Stop 2 (0.7 µA) and Shutdown (16 nA), enabled by a dedicated interconnect matrix and adaptive voltage scaling. Its ART Accelerator™ delivers zero-wait-state execution from flash at 80 MHz, while the internal multispeed oscillator achieves ±0.25% accuracy via LSE auto-trimming.
Peripherals are partitioned across power domains: analog blocks (ADC, OPAMP, COMP) operate from independent supplies; RTC runs from VBAT; and LPUART/LPTIM remain active in Stop 2 mode. The 52 I/Os include 4 wakeup-capable pins and support capacitive touch sensing across 12 channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS performance - enables real-time signal processing in resource-constrained edge nodes. |
| Memory | 128 KB single-bank flash (with readout protection), 40 KB SRAM (8 KB with hardware parity) - supports secure firmware storage and robust data handling. |
| Low-Power Performance | 245 nA Standby with RTC, 0.7 µA Stop 2 mode, 4 µs wake-up time - extends battery life in multi-year deployments without external PMIC. |
| Analog Peripherals | Dual 12-bit ADCs (5 Msps, hardware oversampling to 16-bit), 1 OPAMP with PGA, 1 ultra-low-power comparator - enables local sensor signal conditioning and threshold detection. |
| Communication | USB 2.0 full-speed (crystal-less), 3× I²C (FM+), 3× USART, 1× LPUART, 2× SPI, Quad-SPI with XIP - supports direct USB connectivity and expandable memory/sensor interfaces. |
| Package & Pin Count | LQFP32 (7 × 7 mm), 32-pin footprint - fits compact PCB layouts while retaining 25 GPIOs, 4 wakeup pins, and VBAT/RTC support. |
| Operating Range | −40 °C to +85 °C, 1.71–3.6 V supply - certified for industrial and consumer-grade ambient environments without derating. |
Pinout & Package
LQFP32 (7 × 7 mm) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main digital supply (1.71–3.6 V) | Power domain for CPU, memories, and digital peripherals; supports external SMPS input via VDD12. |
| VSS | Digital ground reference | Common return path for all digital circuitry; requires low-impedance connection to minimize noise coupling. |
| VBAT | Backup supply for RTC and 32×32-bit registers | Enables calendar/timekeeping and non-volatile state retention during main power loss (e.g., coin cell backup). |
| PA0–PA15 | General-purpose I/Os (GPIO) | 25 total GPIOs available; up to 4 configured as wakeup sources; most 5 V-tolerant for mixed-voltage interfacing. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external push-button or supervisor IC assertion. |
| BOOT0 | Boot mode selection | High at power-on selects system memory bootloader; tied low for normal flash execution. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Seven configurable low-power modes (Shutdown, Standby, Stop 0/1/2, Sleep, Run) with per-peripheral clock gating - reduces system-level energy use without sacrificing responsiveness. |
| ART Accelerator™ | Zero-wait-state execution from flash at 80 MHz - eliminates external RAM dependency for deterministic real-time code execution. |
| Integrated analog front-end | Dual ADCs with hardware oversampling, OPAMP with programmable gain, and ultra-low-power comparator - enables self-contained sensor signal acquisition and decision logic. |
| Crystal-less USB 2.0 FS | Internal 48 MHz clock recovery system (CRS) synchronized to USB SOF - removes external crystal, saving BOM cost and board area. |
| Capacitive touch sensing | 12-channel TSC supporting touchkey, linear, and rotary sensors - allows intuitive HMI implementation without external controller. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered environmental sensor collecting temperature, humidity, and motion data every 5 minutes, transmitting via BLE or LoRaWAN. IC Role / Device Role / Timing Role: Main system controller executing sensor polling, ADC conversion, data preprocessing, and low-power scheduling; RTC provides precise wake-up intervals. Use Value: 245 nA Standby-with-RTC enables >10-year coin-cell operation; LPUART and LPTIM allow scheduled wake-up and minimal active time. |
Use Scenario: Handheld pulse oximeter with OLED display, optical sensors, and rechargeable Li-ion battery. IC Role / Device Role / Timing Role: Central processor managing optical signal acquisition (via ADC/OPAMP), SpO₂ calculation, display refresh, and USB charging negotiation. Use Value: Dual 12-bit ADCs sample photodiode signals at 5 Msps; built-in OPAMP with PGA conditions weak analog signals before digitization. |
| Smart Utility Meter | Asset Tracking Tag |
Use Scenario: Battery-operated water/gas meter logging flow rate, pressure, and tamper events, reporting hourly via NB-IoT. IC Role / Device Role / Timing Role: Primary MCU handling metrology calculations, secure data logging to flash, RTC-based timestamping, and modem interface control. Use Value: 128 KB flash stores firmware + encrypted usage logs; hardware CRC and 96-bit UID support secure firmware updates and device identity. |
Use Scenario: GPS-enabled logistics tag monitoring location, shock, and temperature during shipment, waking only on motion or geofence breach. IC Role / Device Role / Timing Role: System-on-chip managing accelerometer interrupt detection, GPS cold-start timing, and low-power data transmission. Use Value: 16 nA Shutdown mode preserves battery during transit; 4 µs wake-up from Stop mode ensures rapid response to motion triggers. |
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 |
|---|---|---|---|
| STM32L432KCU6 | 64 KB flash, 16 KB SRAM, same LQFP32 package, includes AES-256 and PKA crypto accelerators | Better suited for secure firmware OTA updates and TLS stack offload in connected devices | Select when cryptographic acceleration and secure boot are required; trade-off is reduced memory headroom. |
| STM32L071RBT6 | Cortex-M0+, 32 KB flash, 8 KB SRAM, 380 nA Standby (no RTC), lower peripheral count | Targeted at simpler, cost-sensitive sensor endpoints with minimal processing needs | Choose for lowest BOM cost where 80 MHz M4 performance and dual ADCs are unnecessary. |
Compared with STM32L432KCU6, the STM32L412TBY3TR offers higher memory and analog integration but lacks hardware crypto; versus STM32L071RBT6, it delivers significantly better compute throughput and richer analog capability at modest power overhead.
Availability
STM32L412TBY3TR is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meters, and asset tracking tags requiring stable component supply across multi-year production cycles.
Supply support for STM32L412TBY3TR 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, specializing in microcontrollers, power management, and analog/mixed-signal solutions for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-microwatt, with design focus on battery longevity, rich analog integration, and secure firmware execution in constrained environments.
FAQ
What is the maximum operating frequency and core type of the STM32L412TBY3TR?
The STM32L412TBY3TR features an Arm Cortex-M4 core with FPU, capable of running at up to 80 MHz. It delivers 100 DMIPS and supports DSP instructions. The Adaptive Real-Time Accelerator (ART Accelerator™) enables zero-wait-state execution from flash memory, ensuring deterministic performance without external RAM.
Does the STM32L412TBY3TR support crystal-less USB operation?
Yes - the device integrates a Clock Recovery System (CRS) that synchronizes the internal 48 MHz RC oscillator to the USB Start-of-Frame (SOF) signal. This eliminates the need for an external USB crystal, reducing BOM cost and PCB area while maintaining full USB 2.0 Full-Speed compliance.
What low-power modes are available, and what is the lowest achievable current draw?
The MCU supports seven low-power modes: Shutdown (16 nA), Standby (245 nA with RTC), Stop 2 (0.7 µA), and Sleep (79 µA/MHz). The 16 nA Shutdown mode retains no register state but powers only the reset circuit; Standby with RTC and 32×32-bit backup registers draws 245 nA - verified per DS12469 Rev 9 Table 46.
Which package and pin count does the STM32L412TBY3TR use?
The STM32L412TBY3TR uses the LQFP32 package (7 × 7 mm, 0.8 mm pitch), with 32 pins. It provides 25 general-purpose I/Os, 4 dedicated wakeup pins, VBAT for RTC backup, NRST for reset, and BOOT0 for boot mode selection - fully documented in Section 4 ("Pinouts and pin description") of the official datasheet.
STM32L412TBY3TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 36-UFBGA, WLCSP
- Series:
- STM32L4
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M4F
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- I2C, Infrared, IrDA, LINbus, QSPI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, Temp Sensor, WDT
- Number of I/O:
- 30
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 40K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b SAR
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L412TBY3TR FAQ
1.How can I place an order for STM32L412TBY3TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412TBY3TR 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 STM32L412TBY3TR reliable?
The price and inventory of STM32L412TBY3TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412TBY3TR is usually 5 days.
3.What payment methods are accepted for STM32L412TBY3TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412TBY3TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412TBY3TR?
STM32L412TBY3TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412TBY3TR 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 STM32L412TBY3TR?
For technical support, including STM32L412TBY3TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412TBY3TR requirements.
6.How does Aetrix verify that STM32L412TBY3TR is sourced from the original manufacturer or authorized distributors?
All STM32L412TBY3TR 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 STM32L412TBY3TR meets industry standards.
7.What is the process for return or replacement of STM32L412TBY3TR?
All STM32L412TBY3TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412TBY3TR, 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 STM32L412TBY3TR part is unused and in its original packaging.
Return procedure for STM32L412TBY3TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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