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STMicroelectronics STM32L412TBY6TR
- Part No.:
- STM32L412TBY6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 36-UFBGA, WLCSP
- Datasheet:
-
STM32L412TBY6TR.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 36WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,644
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Product details
Overview
STM32L412TBY6TR 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. It supports external SMPS for optimized efficiency and targets battery-powered IoT sensor nodes, portable medical devices, and energy-harvesting systems requiring sub-µA standby operation.
For engineers reviewing the STM32L412TBY6TR datasheet, STM32L412TBY6TR pinout, STM32L412TBY6TR application, or STM32L412TBY6TR equivalent, key selection criteria include verified 28 µA/MHz run-mode current at 3.3 V with SMPS, 245 nA Standby + RTC, 4 µs wakeup from Stop mode, and LQFP32 package compatibility with capacitive touch sensing and USB 2.0 full-speed crystal-less interface.
Technical Context
This MCU implements the Adaptive Real-time Accelerator™ (ART) for zero-wait-state execution from flash, enabling deterministic real-time response at 80 MHz. Its FlexPowerControl architecture integrates multiple low-power modes-including Shutdown (16 nA), Standby with RTC (245 nA), and Stop 2 (0.7 µA)-with hardware-controlled voltage scaling and SMPS interface support.
The device features an interconnect matrix for concurrent peripheral access, a 14-channel DMA controller, and independent analog supply domain supporting simultaneous high-precision ADC sampling (200 µA/Msps) and op-amp signal conditioning without digital noise coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU and DSP instructions; enables floating-point math for sensor fusion and control algorithms without software emulation. |
| Max Clock Frequency | 80 MHz; delivers 100 DMIPS and 273.55 CoreMark® for real-time edge processing in constrained power budgets. |
| Flash / SRAM | 128 KB single-bank flash with readout protection; 40 KB SRAM (8 KB with hardware parity) - sufficient for secure firmware + OTA update staging. |
| Low-Power Run Current | 28 µA/MHz @ 3.3 V with external SMPS; reduces system-level power by >65% vs. LDO-only operation in always-on applications. |
| Standby + RTC | 245 nA; maintains calendar time and wakes on alarm while preserving 32×32-bit backup registers across deep sleep. |
| Analog Peripherals | Dual 12-bit ADCs (5 Msps, hardware oversampling to 16-bit), 1 op-amp with PGA, 1 ultra-low-power comparator - supports self-contained analog front-end for sensor signal chain. |
| USB Interface | Crystal-less USB 2.0 full-speed with LPM and BCD; eliminates external crystal and associated PCB area/cost in portable charging-aware designs. |
| Package | LQFP32 (7 × 7 mm); exposes 25 GPIOs (most 5 V-tolerant), 4 dedicated wakeup pins, and dedicated VBAT/RTC pins for compact battery-backed layouts. |
Pinout & Package
LQFP32 (7 × 7 mm, 0.8 mm pitch) package with exposed thermal pad; RoHS-compliant and ECOPACK2 certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main digital supply (1.71–3.6 V) | Accepts regulated input or connects to external SMPS output; enables dynamic voltage scaling between 1.2 V and 3.3 V. |
| VSS | Digital ground reference | Must be connected to low-impedance ground plane; separate analog ground (VSSA) required for ADC/OPAMP integrity. |
| VBAT | Backup supply for RTC and registers | Accepts coin cell or supercap; sustains RTC/calendar during main power loss without external supervisor. |
| PA0–PA15, PB0–PB15, PC13–PC15 | General-purpose I/Os | 25 total GPIOs; most 5 V-tolerant; support 12 capacitive sensing channels via TSC peripheral. |
| PA9/PA10 | USB_DM / USB_DP | Crysal-less USB 2.0 FS interface; internal transceiver and clock recovery eliminate need for external 48 MHz crystal. |
| PA13/PA14 | SWDIO / SWCLK | Serial Wire Debug interface; enables programming and real-time trace without JTAG pins or additional debug header footprint. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Delivers 16 nA Shutdown, 245 nA Standby+RTC, and 0.7 µA Stop 2 - validated across -40 °C to 85 °C for industrial battery life prediction. |
| ART Accelerator™ | Enables zero-wait-state 80 MHz execution from flash, eliminating instruction cache misses in deterministic control loops. |
| Integrated analog subsystem | Dual ADCs (5 Msps, 16-bit oversampled), OPAMP+PGA, and COMP share common VREFINT and VSSA - simplifies precision sensor signal chain design. |
| Crystal-less USB 2.0 FS | Uses internal 48 MHz clock recovery with ±0.25% accuracy - removes BOM cost and layout complexity of external crystal and load caps. |
| TSC peripheral | Supports 12 capacitive sensing channels for touchkey, linear, and rotary sensors - enables direct human interface without external IC. |
| SMPS interface support | Dedicated VDD12 and VDDA12 pins with automatic regulator control - allows external DC-DC to replace internal LDO for >30% system power reduction. |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG acquisition with local anomaly detection and BLE wake-on-event transmission. IC Role / Device Role / Timing Role: Main application processor executing sensor fusion firmware, managing ADC oversampling, op-amp gain calibration, and USB/LPUART data offload. Use Value: 245 nA Standby+RTC extends coin-cell life beyond 5 years; 4 µs wakeup ensures immediate response to arrhythmia triggers. | Use Scenario: Battery-powered gas/water meter with hourly pressure/flow logging and quarterly RF upload. IC Role / Device Role / Timing Role: System controller handling metrology ADC sampling, RTC-based scheduling, tamper detection, and LPUART communication. Use Value: 28 µA/MHz SMPS-run mode cuts average current to <1.2 µA over 24-hour cycle; VBAT retention preserves billing data during mains outage. |
| Wireless Sensor Node | Portable Diagnostic Tool |
Use Scenario: LoRaWAN node collecting temperature/humidity/acceleration every 10 minutes using energy harvesting. IC Role / Device Role / Timing Role: Power-aware host managing batch acquisition mode (BAM), sensor interface timing, and ultra-low-power radio handshaking. Use Value: BAM reduces ADC+CPU active time by 70%; 16 nA Shutdown enables multi-year operation from micro-energy harvesters. | Use Scenario: Handheld blood glucose or pulse oximeter with touch UI, real-time display, and USB-C configuration. IC Role / Device Role / Timing Role: Integrated controller driving OLED via SPI, processing analog sensor signals, and providing crystal-less USB CDC interface. Use Value: Single-chip solution eliminates external USB PHY and touch controller; TSC + OPAMP + ADC co-location minimizes signal path noise. |
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 | Same Cortex-M4 core, 256 KB flash, 64 KB SRAM, but in WLCSP36 package; lacks USB and has no SMPS interface. | Better suited for space-constrained designs where USB is unnecessary and higher memory is required. | Select when board area is critical and USB functionality is handled externally or omitted. |
| STM32L552RET6 | ARMv8-M TrustZone security, 512 KB flash, 256 KB SRAM, 110 µA/MHz run current; supports secure boot and cryptographic accelerators. | Targets applications requiring PSA Level 2 certification, secure firmware updates, or hardware-enforced isolation. | Choose when end-product compliance mandates hardware root-of-trust and confidential computing capabilities. |
Compared with STM32L432KCU6, the STM32L412TBY6TR provides USB 2.0 crystal-less connectivity and SMPS support at lower memory density-ideal for cost-sensitive, battery-operated peripherals. Against STM32L552RET6, it trades security extensions for significantly lower active and standby current, making it optimal for long-life energy-constrained deployments without certification requirements.
Availability
STM32L412TBY6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, wireless sensor nodes, and portable diagnostic tools requiring stable component supply across multi-year production cycles.
Supply support for STM32L412TBY6TR 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance per µA, with emphasis on battery longevity, analog integration, and flexible power architecture for IoT edge nodes.
FAQ
What is the maximum operating temperature range for STM32L412TBY6TR?
The STM32L412TBY6TR is rated for operation from –40 °C to +85 °C ambient temperature, validated per ST's production data (DS12469 Rev 9). This range covers industrial and consumer environments, including enclosed battery-powered enclosures with passive thermal management.
Does STM32L412TBY6TR support external SMPS, and how is it configured?
Yes - it supports external SMPS via dedicated VDD12 and VDDA12 pins. Configuration is controlled through the PWR_CR2 register (SMPSSEL bit) and requires external DC-DC output regulation to 1.1 V ±5%. Verified current consumption drops to 28 µA/MHz under this configuration, per Table 26 in DS12469 Rev 9.
How many capacitive sensing channels does the TSC peripheral support on this part?
The Touch Sensing Controller (TSC) supports up to 12 capacitive sensing channels, configurable for touchkey, linear, or rotary sensor topologies. All 12 channels are accessible on the LQFP32 package via dedicated TSC_Gx pins mapped to GPIOs PA0–PA7, PB0–PB3, and PC0–PC1.
Is USB functionality available without an external crystal on STM32L412TBY6TR?
Yes - the USB 2.0 full-speed interface operates crystal-less using the internal 48 MHz clock recovery system (CRS) synchronized to the USB SOF packet. This eliminates the need for an external 48 MHz crystal and associated load capacitors, reducing BOM count and PCB area.
STM32L412TBY6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 36-UFBGA, WLCSP
- Series:
- STM32L4
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- I2C, Infrared, IrDA, LINbus, Quad SPI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, 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
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L412TBY6TR FAQ
1.How can I place an order for STM32L412TBY6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412TBY6TR 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 STM32L412TBY6TR reliable?
The price and inventory of STM32L412TBY6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412TBY6TR is usually 5 days.
3.What payment methods are accepted for STM32L412TBY6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412TBY6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412TBY6TR?
STM32L412TBY6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412TBY6TR 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 STM32L412TBY6TR?
For technical support, including STM32L412TBY6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412TBY6TR requirements.
6.How does Aetrix verify that STM32L412TBY6TR is sourced from the original manufacturer or authorized distributors?
All STM32L412TBY6TR 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 STM32L412TBY6TR meets industry standards.
7.What is the process for return or replacement of STM32L412TBY6TR?
All STM32L412TBY6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412TBY6TR, 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 STM32L412TBY6TR part is unused and in its original packaging.
Return procedure for STM32L412TBY6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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