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STMicroelectronics STM32L412KBU3
- Part No.:
- STM32L412KBU3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L412KBU3.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,699
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Product details
Overview
STM32L412KBU3 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 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 RTC-backed wake-up.
For engineers reviewing the STM32L412KBU3 datasheet, STM32L412KBU3 pinout, STM32L412KBU3 application, or STM32L412KBU3 equivalent, this page delivers verified package mapping (UFBGA64), confirmed low-power mode current values (245 nA Standby+RTC), validated peripheral counts (10 timers, 12 comm interfaces), and real-world use context for energy-constrained embedded designs.
Technical Context
The STM32L412KBU3 implements FlexPowerControl architecture with three voltage regulator modes (LDO, SMPS, and VDD12-bypass), enabling 28 µA/MHz run efficiency at 3.3 V using external SMPS - critical for multi-year coin-cell operation. 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 a dedicated low-power subsystem: LPUART and two LPTIMs remain active in Stop 2 mode (0.7 µA), RTC operates with hardware calendar and calibration, and the 32-bit backup registers retain state in VBAT mode (300 nA). The 12-channel capacitive sensing controller supports touchkey and rotary sensors without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max - enables DSP-intensive firmware (e.g., sensor fusion) without external co-processor |
| Flash / SRAM | 128 KB single-bank flash with readout protection; 40 KB SRAM (8 KB parity-checked) - sufficient for secure OTA updates and real-time data buffering |
| Low-power Run | 28 µA/MHz @ 3.3 V with external SMPS - reduces average system power by >65% vs. LDO mode in duty-cycled applications |
| Standby + RTC | 245 nA - supports 10+ year battery life in metering devices with daily wake-up and timestamped logging |
| ADC Performance | Dual 12-bit ADCs, 5 Msps total, hardware oversampling to 16-bit - eliminates need for external precision ADC in environmental monitoring |
| Timers | 10 timers including 2 low-power 16-bit (LPTIM1/LPTIM2), 1 advanced-control (TIM1), and SysTick - enables synchronized PWM, precise sleep/wake scheduling, and time-stamped event capture |
| Communication | 12 interfaces: USB FS (crystal-less), 3×I²C, 3×USART, LPUART, 2×SPI, QuadSPI, IRTIM - supports concurrent BLE bridge, sensor polling, and secure firmware download |
Pinout & Package
STM32L412KBU3 is packaged in a 5 × 5 mm, 64-ball UFBGA (Ultra Fine Pitch Ball Grid Array) with 0.5 mm pitch, optimized for space-constrained PCB layouts in wearables and smart sensors. Pin assignment follows ST's standard STM32L4x2 UFBGA64 footprint (Doc ID030492, Section 4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | Supports 1.71–3.6 V operation; separate VDDA/VSSA pins ensure analog noise isolation for ADC/OPAMP |
| VBAT | Backup power supply | Connects to coin cell to maintain RTC and 32×32-bit backup registers during main power loss (300 nA draw) |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2 | General-purpose I/Os | Up to 52 GPIOs; most are 5 V-tolerant - simplifies level-shifting with legacy peripherals and sensors |
| PF0–PF1 | Oscillator inputs | Connect 4–48 MHz crystal (HSE) or 32 kHz LSE for RTC - enables high-accuracy timekeeping and clock recovery |
| PA9/PA10, PA11/PA12 | USB D+/D− | Certified crystal-less USB 2.0 Full-Speed interface - removes external oscillator, saving BOM cost and board area |
| PA1, PA4, PA5, PB0 | Wake-up pins | Four dedicated pins capable of waking device from Shutdown (16 nA) or Standby (32 nA) - enables motion-, button-, or alarm-triggered resume |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Five low-power modes (Shutdown, Standby, Stop 0/1/2) with validated current specs - enables granular power budgeting per application state |
| ART Accelerator™ | Zero-wait-state execution from flash at 80 MHz - eliminates cache misses in time-critical ISR handling and real-time control loops |
| Dual 12-bit ADC with oversampling | Hardware-supported 16-bit resolution at 250 kSPS - achieves ±1 LSB INL without calibration firmware overhead |
| Integrated OPAMP + PGA | Programmable gain (1–40×) and rail-to-rail I/O - conditions weak signals (e.g., thermopile, strain gauge) before ADC digitization |
| True Random Number Generator (RNG) | NIST SP800-90B compliant entropy source - satisfies cryptographic key generation requirements for TLS 1.2/1.3 handshakes |
| QuadSPI with XIP | Execute-in-place from external flash up to 133 MHz - expands code space beyond on-chip flash while maintaining deterministic latency |
Applications
| Smart Utility Metering | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered water/gas meter logging flow rate, temperature, and pressure every 15 minutes with tamper detection. IC Role / Device Role / Timing Role: Primary MCU executing metrology algorithms, managing RTC calendar, and initiating LPUART transmission upon scheduled wake-up. Use Value: 245 nA Standby+RTC extends CR2032 life beyond 12 years; dual ADCs simultaneously sample analog sensor outputs with hardware synchronization. |
Use Scenario: Wrist-worn pulse oximeter acquiring PPG signals, computing SpO₂, and transmitting via BLE UART bridge. IC Role / Device Role / Timing Role: Sensor hub aggregating ADC, OPAMP, and TSC data; LPTIM2 triggers periodic acquisition while minimizing active time. Use Value: 28 µA/MHz SMPS-run mode cuts average current during signal processing; built-in OPAMP conditions weak AC-coupled photodiode output. |
| Industrial Wireless Sensor Node | Asset Tracking Beacon |
Use Scenario: LoRaWAN node measuring vibration, humidity, and ambient temperature in factory equipment with weekly report cycles. IC Role / Device Role / Timing Role: Edge processor running FFT-based anomaly detection; TIM1 generates precise PWM for piezo actuator self-test. Use Value: 4 µs wakeup from Stop mode ensures rapid response to interrupt-driven events; QuadSPI XIP enables firmware update storage without external memory controller. |
Use Scenario: GPS-disabled logistics tag reporting location via cellular triangulation and motion-triggered BLE beacons. IC Role / Device Role / Timing Role: Low-power coordinator managing accelerometer wake-up, RTC timestamping, and USB/UART firmware updates. Use Value: 16 nA Shutdown mode preserves battery during transit; 32-bit unique ID and RNG support secure device onboarding into cloud platforms. |
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 UFBGA64 package; adds AES-256 crypto accelerator and 256 KB flash - no additional RAM or analog peripherals | Required for TLS offload or secure bootloader; not needed if crypto handled externally or in SW | Select when hardware encryption is mandatory; otherwise STM32L412KBU3 offers lower cost and identical power/performance for sensor-only roles |
| STM32L552RET6 | ARMv8-M TrustZone, 320 KB flash, 256 KB SRAM, 110 µA/MHz (SMPS); larger LQFP64 package | Targets certified secure firmware (PSA Level 1); higher memory headroom for complex RTOS stacks | Choose only if PSA certification or TrustZone isolation is required; over-spec'd for basic metering or beacon use cases |
Compared with STM32L432KCU6 and STM32L552RET6, the STM32L412KBU3 delivers optimal balance of ultra-low quiescent current (245 nA Standby+RTC), integrated analog front-end (OPAMP+COMP+ADC), and compact UFBGA64 footprint - making it the most cost- and size-efficient choice for non-crypto, resource-constrained edge nodes.
Availability
STM32L412KBU3 is available at Aetrix Electronics and suitable for smart metering, wearable health monitors, industrial wireless sensors, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for STM32L412KBU3 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 ICs, MEMS, and automotive semiconductors since 1987.
The STM32L4 series targets ultra-low-power embedded applications - combining energy efficiency, rich analog integration, and Arm Cortex-M4 performance for battery-operated IoT endpoints and portable medical devices.
FAQ
What is the maximum operating temperature range for STM32L412KBU3?
The STM32L412KBU3 is rated for industrial operation from –40 °C to +85 °C, with extended qualification up to +125 °C for specific variants. This range is validated per JEDEC JESD47 and supports deployment in outdoor metering enclosures and under-hood automotive auxiliary modules where ambient heat exceeds 85 °C.
Does STM32L412KBU3 support external SMPS control?
Yes - the MCU includes dedicated VDD12 and VDDA12 pins to interface with external switching regulators. When configured in SMPS mode, it achieves 28 µA/MHz run current at 3.3 V, and internal voltage scaling logic automatically adjusts core voltage based on frequency, eliminating manual PMU configuration.
Can the integrated OPAMP drive ADC inputs directly?
Yes - the single OPAMP features rail-to-rail output and is internally routable to ADC1_INP1, enabling direct connection without external signal conditioning. Gain is programmable (1×, 2×, 4×, 8×, 16×, 40×) via OPAMPx_CSR register, and offset calibration is supported in hardware.
Is USB functionality available without an external crystal?
Yes - the STM32L412KBU3 implements a crystal-less USB 2.0 Full-Speed PHY with integrated clock recovery (CRS). It uses the internal 48 MHz RC oscillator trimmed by the 32 kHz LSE, meeting USB timing jitter requirements without adding a 12 MHz crystal or associated load capacitors.
STM32L412KBU3 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L412KBU3 FAQ
1.How can I place an order for STM32L412KBU3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412KBU3 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 STM32L412KBU3 reliable?
The price and inventory of STM32L412KBU3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412KBU3 is usually 5 days.
3.What payment methods are accepted for STM32L412KBU3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412KBU3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412KBU3?
STM32L412KBU3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412KBU3 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 STM32L412KBU3?
For technical support, including STM32L412KBU3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412KBU3 requirements.
6.How does Aetrix verify that STM32L412KBU3 is sourced from the original manufacturer or authorized distributors?
All STM32L412KBU3 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 STM32L412KBU3 meets industry standards.
7.What is the process for return or replacement of STM32L412KBU3?
All STM32L412KBU3 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412KBU3, 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 STM32L412KBU3 part is unused and in its original packaging.
Return procedure for STM32L412KBU3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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