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STMicroelectronics STM32L412KBU6
- Part No.:
- STM32L412KBU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L412KBU6.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:7,604
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Product details
Overview
STM32L412KBU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz and delivering 100 DMIPS. It integrates 128 KB flash, 40 KB SRAM (8 KB with hardware parity), and supports external SMPS for optimized efficiency. Key features include dual 12-bit ADCs (5 Msps), one operational amplifier with PGA, one ultra-low-power comparator, USB 2.0 full-speed crystal-less interface, and RTC with hardware calendar-deployed in battery-powered IoT sensor nodes requiring long runtime and precise analog sensing.
For engineers reviewing the STM32L412KBU6 datasheet, STM32L412KBU6 pinout, STM32L412KBU6 application, or STM32L412KBU6 equivalent, this page delivers verified technical context, low-power mode timing data, analog peripheral configuration limits, and validated alternative MCUs for energy-constrained embedded designs.
Technical Context
The STM32L412KBU6 implements FlexPowerControl architecture with seven low-power modes: Shutdown (16 nA), Standby (32 nA), Stop 2 (245 nA with RTC), and Run mode as low as 28 µA/MHz using external SMPS. Its ART Accelerator™ enables zero-wait-state execution from flash at 80 MHz, while the interconnect matrix decouples bus arbitration for deterministic peripheral access.
It integrates independent analog supply domains supporting simultaneous operation of two 12-bit ADCs (5 Msps, hardware oversampling to 16-bit), one rail-to-rail op-amp with programmable gain, and one comparator with window mode-all functional in Stop 2 mode. The USB interface operates without external crystal via internal 48 MHz clock recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU and DSP instructions, 80 MHz max frequency, 100 DMIPS performance |
| Memory | 128 KB single-bank flash with readout protection; 40 KB SRAM (8 KB with hardware parity) |
| Power Consumption | 28 µA/MHz in Run mode with SMPS; 245 nA in Standby with RTC; 16 nA in Shutdown mode |
| Analog Peripherals | 2× 12-bit ADCs (5 Msps, 200 µA/Msps); 1× op-amp with built-in PGA; 1× ultra-low-power comparator |
| Timers & RTC | 10 timers including 2× low-power 16-bit (active in Stop mode); RTC with HW calendar, alarms, calibration |
| Communication | USB 2.0 FS crystal-less; 3× I²C FM+; 3× USART; 1× LPUART; 2× SPI; 1× Quad SPI; IRTIM infrared interface |
| Package | UFBGA64 (5 × 5 mm, 0.4 mm pitch), RoHS-compliant ECOPACK2 |
Pinout & Package
STM32L412KBU6 is housed in a 64-ball UFBGA package (5 × 5 mm, 0.4 mm pitch) with 52 fast I/Os-most 5 V-tolerant-and dedicated power/ground ball layout optimized for low-noise analog operation and thermal dissipation in compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDIO2 | Core, analog, and I/O supply inputs | Separate domains enable noise isolation: VDDA powers ADC/OPAMP/COMP; VDDIO2 supplies 5 V-tolerant GPIOs |
| VSS, VSSA, VSSIO2 | Core, analog, and I/O ground returns | Dedicated analog ground (VSSA) minimizes coupling into sensitive ADC/OPAMP paths |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15 | General-purpose I/Os with alternate functions | 52 total GPIOs; most support 5 V tolerance, EXTI, and multiple AFs-including USB, USART, SPI, I²C, and timer channels |
| VBAT | Battery backup supply input | Enables RTC and 32×32-bit backup registers during main power loss; draws only 300 nA |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external reset button or supervisor IC assertion |
| BOOT0 | Boot mode selection | High at power-up selects system memory bootloader; low selects user flash; internal pull-down |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl low-power architecture | Seven configurable power modes with sub-µA standby and 4 µs wakeup from Stop-enabling multi-year battery life in sensor endpoints |
| ART Accelerator™ with prefetch | Zero-wait-state execution from flash at 80 MHz, eliminating cache misses in deterministic real-time control loops |
| Dual independent analog domains | VDDA/VSSA separation allows simultaneous high-precision ADC sampling and op-amp signal conditioning without digital noise coupling |
| Crystal-less USB 2.0 FS | Internal 48 MHz clock recovery eliminates external crystal and matching capacitors-reducing BOM count and PCB area |
| Hardware CRC and 96-bit UID | Dedicated CRC unit accelerates firmware integrity checks; unique ID enables secure device authentication and license binding |
Applications
| Smart Utility Metering | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-operated gas/water meter with pressure, temperature, and flow sensing over 10+ years. IC Role / Device Role / Timing Role: Main controller managing sensor acquisition, metrology calculations, RF transmission, and ultra-low-power sleep scheduling. Use Value: 245 nA Standby with RTC ensures accurate timekeeping and periodic wakeups without depleting coin-cell batteries prematurely. |
Use Scenario: Continuous ECG and skin temperature monitoring in wrist-worn patch with Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Signal acquisition hub interfacing analog front-end sensors, performing real-time filtering, and managing BLE packetization. Use Value: Dual 12-bit ADCs sample ECG at 5 Msps with hardware oversampling to 16-bit resolution while consuming only 200 µA/Msps. |
| Industrial Predictive Maintenance Sensor | Asset Tracking Beacon |
Use Scenario: Vibration and temperature node on rotating machinery, transmitting alerts via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Edge processor running FFT-based anomaly detection, accelerometer interface, and LoRa modulation control. Use Value: Op-amp with PGA conditions piezoelectric sensor output directly-eliminating external amplification stages and reducing component count. |
Use Scenario: GPS-denied indoor asset tracker using BLE proximity and motion-triggered location logging. IC Role / Device Role / Timing Role: Motion-aware controller using LPTIM2 for ultra-low-power wake-on-motion and LPUART for BLE UART bridge. Use Value: LPUART retains full functionality in Stop 2 mode (245 nA), enabling immediate BLE response upon movement detection. |
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 | 128 KB flash, 32 KB SRAM, includes AES-256 and SHA-256 crypto accelerators; no external SMPS support | Better suited for secure firmware updates and encrypted sensor data transmission | Select when cryptographic offload is required and SMPS integration is unnecessary |
| STM32L552RET6 | ARM TrustZone®, 512 KB flash, 256 KB SRAM, 110 µA/MHz Run (SMPS), VDD range 1.71–3.6 V | Targeted at higher-security industrial gateways needing secure boot and runtime isolation | Choose for applications requiring hardware-enforced security partitioning and larger memory footprint |
Compared with STM32L412KBU6, STM32L432KCU6 adds crypto acceleration but lacks SMPS support-increasing active-mode current by ~12 µA/MHz-while STM32L552RET6 doubles memory and adds TrustZone at the cost of higher minimum supply current and larger UFBGA100 packaging.
Availability
STM32L412KBU6 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical devices, smart utility meters, and industrial predictive maintenance systems requiring stable component supply across multi-year production cycles.
Supply support for STM32L412KBU6 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 analog components for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, integrated analog precision, and robust real-time performance-optimized for energy harvesting and coin-cell-powered edge devices.
FAQ
What is the maximum operating frequency and corresponding power supply requirement?
The STM32L412KBU6 operates up to 80 MHz with a core supply voltage of 1.71–3.6 V. At 80 MHz, it requires either internal LDO regulation (79 µA/MHz) or external SMPS (28 µA/MHz). The 1.1 V SMPS input (VDD12) must be stable within ±2% for full-frequency operation per DS12469 Section 6.3.6.
Does the device support hardware-accelerated cryptography?
No. The STM32L412KBU6 does not integrate AES, SHA, or PKA accelerators. Cryptographic operations must be implemented in software or via external co-processors. For hardware crypto, ST recommends the STM32L432KCU6 (AES-256/SHA-256) or STM32L552RET6 (TrustZone + AES).
Can the op-amp drive external loads directly, and what is its output swing?
Yes-the integrated rail-to-rail op-amp supports driving capacitive loads up to 100 pF and delivers full-swing output (VSSA to VDDA) under 60 kΩ load. Its typical GBW is 1.3 MHz and input offset is ±1.5 mV, making it suitable for sensor signal conditioning without external buffering.
How many pins support wake-up from Stop 2 mode, and which peripherals remain active?
Four dedicated wakeup pins (PA0, PA1, PC13, PC14) can exit Stop 2 mode. During Stop 2, the LPUART, LPTIM1/LPTIM2, RTC, and COMP remain fully functional; ADC and op-amp are disabled but retain configuration for rapid reactivation upon wake.
STM32L412KBU6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L4
- Packaging:
- Tray
- 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:
- 26
- 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:
STM32L412KBU6 FAQ
1.How can I place an order for STM32L412KBU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412KBU6 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 STM32L412KBU6 reliable?
The price and inventory of STM32L412KBU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412KBU6 is usually 5 days.
3.What payment methods are accepted for STM32L412KBU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412KBU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412KBU6?
STM32L412KBU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412KBU6 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 STM32L412KBU6?
For technical support, including STM32L412KBU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412KBU6 requirements.
6.How does Aetrix verify that STM32L412KBU6 is sourced from the original manufacturer or authorized distributors?
All STM32L412KBU6 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 STM32L412KBU6 meets industry standards.
7.What is the process for return or replacement of STM32L412KBU6?
All STM32L412KBU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412KBU6, 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 STM32L412KBU6 part is unused and in its original packaging.
Return procedure for STM32L412KBU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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