STMicroelectronics STM32L433VCI6

Overview

STM32L433VCI6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 256 KB flash, 64 KB SRAM, USB FS, LCD controller, and integrated SMPS support. It targets battery-powered portable instrumentation, wearable health monitors, and smart sensor nodes requiring sub-µA standby operation and high analog integration.

For engineers reviewing the STM32L433VCI6 datasheet, STM32L433VCI6 pinout, STM32L433VCI6 application, or STM32L433VCI6 equivalent, key selection criteria include its 280 nA Standby+RTC current, 36 µA/MHz SMPS-run efficiency, 12-bit 5 Msps ADC with hardware oversampling, and UFBGA64 package compatibility with space-constrained PCB layouts.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 80 MHz, alongside a memory protection unit (MPU) and proprietary code readout protection. Its FlexPowerControl architecture supports multiple low-power modes-including 28 nA Standby and 84 µA/MHz LDO-run-with voltage scaling and batch acquisition mode (BAM) for dynamic power optimization.

Clock management includes dual PLLs (system/USB/audio), internal 48 MHz RC with clock recovery, and auto-trimmed multispeed oscillator (±0.25%). Analog subsystem comprises one 12-bit ADC (5 Msps, 16-bit oversampling), two 12-bit DACs, one op-amp with PGA, and two ultra-low-power comparators-all with independent supply domains.

Key Specifications

Pinout & Package

STM32L433VCI6 uses the UFBGA64 (A019) package: 5 mm × 5 mm, 0.5 mm ball pitch, 64 I/O balls in 8×8 array with central thermal pad. Pin functions align with STM32L433xx family standard mapping per DS11449 Rev 8 Section 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433VCI6, STM32L432KCU6 reduces memory and peripheral count for cost-sensitive designs, while STM32L476VGT6 trades ultra-low-power optimization for higher performance and extended temperature tolerance-making the VCI6 optimal for balanced display-enabled IoT endpoints.

Availability

STM32L433VCI6 is available at Aetrix Electronics and suitable for wearable health monitors, smart gas sensor nodes, industrial handheld terminals, and energy meter display modules requiring stable component supply across long production lifecycles.

Supply support for STM32L433VCI6 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 devices for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high analog integration, rich connectivity, and robust security-optimized for battery-operated edge devices with display, sensing, and wireless gateway functions.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating of the STM32L433VCI6?

The STM32L433VCI6 operates at up to 80 MHz with an Arm Cortex-M4 core featuring FPU and DSP extensions, delivering 100 DMIPS (Dhrystone 2.1). This performance is sustained with zero wait states via the ART Accelerator™ when executing from flash memory, confirmed in DS11449 Rev 8 Section 3.1.

Does the STM32L433VCI6 support external SMPS regulation, and what power savings does it provide?

Yes, the STM32L433VCI6 supports external SMPS via dedicated VDD12 and VDD12_IO pins. In SMPS mode, active current drops to 36 µA/MHz versus 84 µA/MHz in LDO mode-a 57% reduction-enabling significantly longer battery life in always-on applications, as specified in DS11449 Rev 8 Table 27.

How many I/O pins are 5 V-tolerant, and which interfaces rely on them?

Up to 83 I/Os are 5 V-tolerant, covering all GPIO ports (PA–PE, PF). Key interfaces using these include USB (PA11/PA12), CAN (PB8/PB9), USARTs (e.g., PA9/PA10), and SPI (PA5/PA6/PA7), allowing direct connection to 5 V logic without level shifters-verified in DS11449 Rev 8 Section 3.12 and Table 14.

What LCD configurations does the integrated controller support, and is external bias required?

The STM32L433VCI6 LCD controller supports 8×40 or 4×44 segment configurations with integrated step-up converter (VLCD), eliminating need for external bias generation. It drives common-electrode and segment lines directly, and supports static, 2/3/4 multiplex modes-detailed in DS11449 Rev 8 Section 3.21 and electrical characteristics Table 25.