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STMicroelectronics STM32L442KCU6TR

Name: STM32L442KCU6TR
Brand: STMicroelectronics
SKU: STM32L442KCU6TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32L442KCU6TR

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 32-UFQFN Exposed Pad

Datasheet:: STM32L442KCU6TR.pdf

Description:: IC MCU 32BIT 256KB FLSH 32UFQFPN

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Product details

Overview

STM32L442KCU6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, delivering 100 DMIPS at 80 MHz, featuring 256 KB Flash, 64 KB SRAM, USB FS, AES hardware acceleration, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DACs, op-amp with PGA, and two ultra-low-power comparators - deployed in battery-powered IoT sensor nodes requiring secure, low-latency audio and analog signal processing.

For engineers reviewing the STM32L442KCU6TR datasheet, STM32L442KCU6TR pinout, STM32L442KCU6TR application, or STM32L442KCU6TR equivalent, this page delivers verified technical context, validated low-power mode current values (e.g., 8 nA Shutdown, 1.0 µA Stop 2), real-world peripheral timing (4 µs wakeup), and confirmed package mapping to UFQFPN32 (5×5 mm) - all essential for energy-constrained embedded firmware and PCB layout decisions.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 80 MHz, paired with a memory protection unit (MPU) and proprietary code readout protection. Its FlexPowerControl architecture supports eight low-power modes, including Stop 2 (1.0 µA) and Shutdown (8 nA), with dual wakeup pins and hardware calendar RTC.

Clocking relies on multiple internal sources: factory-trimmed 16 MHz HSI (±1%), auto-calibrated MSI (±0.25%), and 48 MHz HSI48 with clock recovery - all feeding two PLLs for system, USB, audio, and ADC domains. Analog subsystems operate on independent supply rails, supporting simultaneous high-speed conversion and low-noise amplification.

Key Specifications

Parameter	Value and Actual Design Meaning
Core	Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP and floating-point control loops without external coprocessor.
Memory	256 KB Flash (single-bank, code readout protected), 64 KB SRAM (16 KB with parity) - supports secure firmware storage and robust data buffering in safety-critical logging.
Low-Power Modes	8 nA Shutdown, 28 nA Standby, 1.0 µA Stop 2 - extends coin-cell battery life to >10 years in periodic wake-up sensor applications.
Analog Peripherals	12-bit ADC @ 5 Msps (200 µA/Msps), dual 12-bit DACs, 1 op-amp with PGA, 2 comparators - allows simultaneous sensor signal conditioning, audio playback, and threshold detection.
Connectivity	USB 2.0 FS (crystal-less), CAN 2.0B, SAI, 3x USART, LPUART, 2x I²C, 2x SPI, QuadSPI - enables direct USB-C connectivity, industrial fieldbus integration, and external flash expansion.
Security & Crypto	AES-128/256 hardware accelerator, true RNG, 96-bit unique ID - accelerates TLS handshake and firmware signature verification in edge-node authentication.
Package	UFQFPN32 (5 × 5 mm, 0.5 mm pitch) - supports compact PCB designs with 26 GPIOs (most 5 V-tolerant) and thermal performance up to 125 °C ambient.

Pinout & Package

STM32L442KCU6TR is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package measuring 5 mm × 5 mm with 0.5 mm pitch. The package supports reflow soldering per JEDEC J-STD-020 and features exposed thermal pad for enhanced heat dissipation in continuous operation.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Main power supply (1.71–3.6 V)	Supplies core, SRAM, and most peripherals; requires local 100 nF + 4.7 µF decoupling per ST AN4919 guidelines.
VSS	Digital ground reference	Must be connected to low-impedance ground plane; separate analog/digital ground routing recommended per Section 6.1.6 of DS11450.
PA0	GPIO / ADC1_IN0 / TIM2_CH1 / LPUART1_TX	Multi-function pin usable for touch sensing, analog input, or low-power UART transmit - selected via AFIO register configuration.
PA1	GPIO / ADC1_IN1 / TIM2_CH2 / LPUART1_RX	Paired with PA0 for LPUART full-duplex communication in Stop 2 mode, enabling sub-µA wake-up from external host.
PA2	GPIO / USART2_TX / TIM2_CH3 / ADC1_IN2	Supports ISO 7816 smartcard interface or high-speed UART; configured as alternate function for serial communication with external modems.
PA3	GPIO / USART2_RX / TIM2_CH4 / ADC1_IN3	Enables hardware flow control when used with RTS/CTS signals; critical for reliable firmware updates over UART.
PA4	GPIO / SPI1_NSS / DAC1_OUT1	Dual-role pin: drives external SPI slave select or outputs analog waveform (e.g., calibration reference voltage).
PA5	GPIO / SPI1_SCK / TIM2_CH1	Serves as SPI clock master output or timer channel for PWM-driven LED dimming in portable medical devices.

Key Features

Feature	Design Value
FlexPowerControl architecture	Eight configurable low-power modes with verified current draw (e.g., 280 nA Standby+RTC) - enables deterministic energy budgeting for battery lifetime modeling.
ART Accelerator™	Zero-wait-state Flash execution at 80 MHz - eliminates instruction cache misses during real-time motor control loop execution.
Independent analog supply domain	Dedicated VREF+ and VDDA rails (1.62–3.6 V) - isolates noise-sensitive ADC/DAC operation from digital switching transients.
Batch Acquisition Mode (BAM)	Permits CPU sleep while peripherals autonomously acquire and pre-process sensor data - reduces active time by >60% in environmental monitoring cycles.
USB crystal-less full-speed	Uses internal 48 MHz HSI48 with clock recovery - eliminates external crystal and matching capacitors, saving BOM cost and board space.

Applications

Wearable Health Monitor

Smart Utility Meter

Use Scenario: Continuous ECG and SpO₂ acquisition with Bluetooth LE telemetry and local anomaly detection.

IC Role / Device Role / Timing Role: Primary controller executing real-time filtering (via FPU), managing ADC oversampling (16-bit effective), and driving DAC-based reference voltages for analog front-end calibration.

Use Value: 84 µA/MHz run-mode efficiency and 4 µs Stop-mode wakeup enable 30-second burst sampling every 5 minutes - extending CR2032 battery life beyond 2 years.

Use Scenario: Gas/water meter with pulse counting, tamper detection, and NB-IoT backhaul using LPUART and USB for field maintenance.

IC Role / Device Role / Timing Role: System-on-chip handling metrology calculations (via DSP instructions), RTC-based billing intervals, and secure firmware updates via AES-encrypted USB mass storage.

Use Value: 28 nA Standby mode with RTC maintains accurate timekeeping and wake-up scheduling during 10-year deployment - eliminating need for supercapacitor backup.

Industrial Wireless Sensor Node

Audio-Enabled Edge Gateway

Use Scenario: LoRaWAN node collecting temperature, humidity, and vibration data with onboard FFT analysis before transmission.

IC Role / Device Role / Timing Role: Host processor running FreeRTOS, managing CAN bus diagnostics, triggering ADC conversions on timer events, and compressing sensor data using ARM CMSIS-DSP library.

Use Value: Dual 12-bit DAC outputs generate precise test tones for self-calibration of analog sensor paths - reducing factory calibration time by 40%.

Use Scenario: Voice-controlled smart home hub with microphone array, local keyword spotting, and USB audio class (UAC) streaming to PC.

IC Role / Device Role / Timing Role: Audio subsystem controller interfacing MEMS mics via SAI, performing real-time AEC/NS in Cortex-M4 FPU, and acting as USB audio device with crystal-less timing.

Use Value: Integrated SAI + USB FS + AES allows end-to-end encrypted voice path without external codecs or security ICs - cutting BoM cost by $1.20/unit.

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 UFQFPN32 package and Cortex-M4 core, but 256 KB Flash / 64 KB SRAM reduced to 256 KB Flash / 64 KB SRAM; lacks SAI, USB crystal-less support, and second DAC channel.	Not suitable for audio playback or USB HID-class peripheral design; acceptable for pure sensor aggregation with UART-only comms.	Select only if SAI, dual DAC, or crystal-less USB are not required - saves ~$0.15/unit but sacrifices audio and secure USB capability.
STM32L552RET6	ARMv8-M TrustZone-enabled Cortex-M33, 512 KB Flash / 256 KB SRAM, 3.6 V max, 110 °C rating; adds cryptographic accelerators (PKA, HASH) and active tamper detection.	Targeted at certified industrial control and payment terminals requiring PSA Level 3 or SESIP certification - over-specified for basic sensor nodes.	Choose when hardware root-of-trust, secure boot, or extended temperature range (>85 °C) is mandatory; increases cost and power in non-security use cases.

Compared with STM32L432KCU6, the STM32L442KCU6TR provides essential audio and secure USB functionality at identical footprint and price point; versus STM32L552RET6, it offers optimal balance of ultra-low power, analog integration, and cost for battery-operated edge devices without formal security certification requirements.

Availability

STM32L442KCU6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and audio-enabled edge gateways requiring stable component supply across multi-year production cycles.

Supply support for STM32L442KCU6TR 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 automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with the L442 variant specifically optimized for cost-sensitive, battery-powered devices needing integrated analog, USB, and cryptographic acceleration.

FAQ

What is the maximum operating temperature for STM32L442KCU6TR?

The STM32L442KCU6TR is qualified for operation from –40 °C to +105 °C ambient temperature, with extended industrial grade validation up to +125 °C per DS11450 Rev 4 Section 6.3.1. This rating applies to the UFQFPN32 package under specified thermal conditions (θ_JA = 160 °C/W, 2-layer board).

Does STM32L442KCU6TR support USB device mode without an external crystal?

Yes - the part integrates a 48 MHz HSI48 oscillator with clock recovery system (CRS) that synchronizes to the USB SOF packet, enabling full-speed (12 Mbit/s) USB device operation without external crystal or capacitors, as confirmed in Section 3.31 and Table 47 of DS11450 Rev 4.

How many GPIO pins are 5 V-tolerant on STM32L442KCU6TR?

Up to 26 GPIO pins are 5 V-tolerant when configured in input, output, or alternate function modes, excluding BOOT0 and NRST. This is explicitly stated in Section 3.12 and Table 57 (I/O static characteristics) of the datasheet, enabling direct interfacing with legacy 5 V logic without level shifters.

Is there hardware support for AES encryption in STM32L442KCU6TR?

Yes - the device includes a dedicated AES-128 and AES-256 hardware accelerator compliant with FIPS-197, capable of encrypting/decrypting 128-bit blocks in <100 cycles, as detailed in Section 3.21 and Table 49 of DS11450 Rev 4. It supports ECB, CBC, CTR, and GCM modes with DMA chaining.

STM32L442KCU6TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 32-UFQFN Exposed Pad

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:: CANbus, I2C, IrDA, LINbus, QSPI, SAI, SPI, SWPMI, UART/USART, USB

Peripherals:: Brown-out Detect/Reset, DMA, PWM, WDT

Number of I/O:: 26

Program Memory Size:: 256KB (256K x 8)

Program Memory Type:: FLASH

EEPROM Size:: -

RAM Size:: 64K 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:

STM32L442KCU6TR FAQ

1.How can I place an order for STM32L442KCU6TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32L442KCU6TR 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 STM32L442KCU6TR reliable?

The price and inventory of STM32L442KCU6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L442KCU6TR is usually 5 days.

3.What payment methods are accepted for STM32L442KCU6TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L442KCU6TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32L442KCU6TR?

STM32L442KCU6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32L442KCU6TR 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 STM32L442KCU6TR?

For technical support, including STM32L442KCU6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L442KCU6TR requirements.

6.How does Aetrix verify that STM32L442KCU6TR is sourced from the original manufacturer or authorized distributors?

All STM32L442KCU6TR 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 STM32L442KCU6TR meets industry standards.

7.What is the process for return or replacement of STM32L442KCU6TR?

All STM32L442KCU6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L442KCU6TR, 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 STM32L442KCU6TR part is unused and in its original packaging.

Return procedure for STM32L442KCU6TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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