STMicroelectronics STM32L443RCY6TR

Overview

STM32L443RCY6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 256KB flash, 64KB SRAM, USB FS, LCD controller, and hardware AES encryption. It operates from 1.71–3.6 V across –40 °C to 105 °C, delivers 100 DMIPS at 80 MHz, and achieves 84 µA/MHz in run mode - enabling battery-powered portable medical devices, smart sensors, and energy-harvesting IoT endpoints.

For engineers reviewing the STM32L443RCY6TR datasheet, STM32L443RCY6TR pinout, STM32L443RCY6TR application, or STM32L443RCY6TR equivalent, key selection criteria include its 280 nA standby-with-RTC current, 4 µs wakeup from Stop mode, 12-bit ADC (5 Msps), dual DAC channels, and UFBGA64 (6 × 6 mm) package compatibility with space-constrained industrial HMI designs.

Technical Context

This MCU integrates an Adaptive Real-time Accelerator (ART™) for zero-wait-state execution from flash, dual PLLs supporting USB/audio/ADC clock domains, and a dedicated interconnect matrix enabling concurrent peripheral access without bus contention. Its FlexPowerControl architecture enables dynamic voltage scaling and multiple low-power modes - including Shutdown (8 nA), Standby with RTC (280 nA), and Stop 2 (1.28 µA) - all with deterministic 4 µs wakeup latency.

The analog subsystem includes a 12-bit ADC with hardware oversampling up to 16-bit effective resolution, two rail-to-rail DACs with sample-and-hold, one operational amplifier with programmable gain, and two ultra-low-power comparators - all supplied from an independent analog domain for noise isolation and precision sensor interfacing.

Key Specifications

Pinout & Package

STM32L443RCY6TR uses a 64-pin Ultra-Fine Pitch Ball Grid Array (UFBGA64) package with 0.5 mm ball pitch and 6 × 6 mm body size (package code A019 per ST documentation). The package supports 54 user I/Os, all 5 V-tolerant except analog pins, and features dedicated VDDA/VSSA, VREF+, VREF–, and VBAT supply domains for analog integrity and RTC backup.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L433RCY6TR, this part adds LCD, SAI, and USB crystal-less support for richer HMI/audio; versus STM32L552RCT6, it trades TrustZone for lower active current and broader voltage range - making it optimal for long-life, mixed-signal edge devices without formal security certification.

Availability

STM32L443RCY6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial HMI panels, and energy-harvesting sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32L443RCY6TR 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, MEMS, and automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and secure firmware execution - optimized for IoT edge nodes, portable medical devices, and industrial sensors.

FAQ

What is the maximum operating temperature for STM32L443RCY6TR?

The STM32L443RCY6TR is rated for industrial temperature range: –40 °C to +105 °C. This is confirmed in Section 6.3.1 of DS11421 Rev 6, where ambient operating conditions specify 105 °C maximum for all variants with 'R' density designation, including the RCY6TR UFBGA64 variant.

Does STM32L443RCY6TR support USB without an external crystal?

Yes - it implements a crystal-less USB 2.0 Full-Speed interface using internal 48 MHz clock recovery (CRS) synchronized to the USB SOF signal. This eliminates the need for a 48 MHz crystal, reducing BOM cost and PCB area, as documented in Section 3.34 and Table 11 of DS11421 Rev 6.

How many ADC channels are accessible in the UFBGA64 package?

The UFBGA64 package exposes 16 single-ended ADC input channels (PA0–PA7, PB0–PB1, PC0–PC5, PC7, PC10–PC12, PD2, PE0–PE1), matching the full ADC1 peripheral capability. Pin definitions are verified in Table 14 (pin definitions) and Figure 13 (UFBGA64 pinout) of DS11421 Rev 6.

Is the STM32L443RCY6TR pin-compatible with other STM32L443 variants?

Yes - all STM32L443xx parts (CC/RC/VC) in the same package type share identical pinouts and electrical characteristics. The RCY6TR (256KB flash) is pin-compatible with STM32L443CCY6TR (256KB) and STM32L443VCY6TR (512KB) in UFBGA64, enabling scalable memory upgrades without PCB redesign.