STMicroelectronics STM32L433VCT6

Overview

STM32L433VCT6 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 STM32L433VCT6 datasheet, STM32L433VCT6 pinout, STM32L433VCT6 application, or STM32L433VCT6 equivalent, key selection criteria include its 280 nA Standby-with-RTC current, 36 µA/MHz SMPS-enabled run efficiency, 12-bit ADC with 5 Msps sampling, and LQFP64 package compatibility with industrial temperature range (–40 °C to +105 °C).

Technical Context

The STM32L433VCT6 integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, alongside a memory protection unit (MPU) and dual-voltage domain architecture supporting external SMPS for optimized power delivery. Its interconnect matrix decouples bus arbitration between CPU, DMA, and peripherals to sustain real-time determinism under mixed workloads.

It implements FlexPowerControl with five low-power modes - including Stop 2 (1.28 µA with RTC) and Shutdown (8 nA) - managed via dedicated power control registers and hardware wakeup logic on five configurable pins. The embedded 32 kHz LSE oscillator calibrates internal clock sources to ±0.25% accuracy, enabling precise timing without external crystals in cost-sensitive designs.

Key Specifications

Pinout & Package

LQFP64 package with 64-pin quad flat lead frame, 0.5 mm pitch, exposed thermal pad, and standard JEDEC footprint compatible with automated PCB assembly. Pinout validated per STMicroelectronics DS11449 Rev 8, Section 4 ("Pinouts and pin description").

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433VCT6, the STM32L432KCU6 trades peripheral richness for smaller footprint and lower cost, while the STM32L476VGT6 adds memory headroom and interface depth at higher power and price - making the VCT6 optimal for balanced feature density in mid-tier portable industrial devices.

Availability

STM32L433VCT6 is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, industrial HMIs, and energy metering terminals requiring stable component supply across multi-year production cycles.

Supply support for STM32L433VCT6 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM32L4 series was designed specifically for ultra-low-power embedded applications demanding high analog integration, secure firmware execution, and flexible power management - targeting battery-operated and energy-harvesting systems.

FAQ

What is the maximum operating temperature for STM32L433VCT6?

The STM32L433VCT6 is qualified for industrial temperature range: –40 °C to +105 °C. This rating is confirmed in Section 6.3.1 of DS11449 Rev 8 and applies to all LQFP64 variants. Thermal derating begins above 105 °C, and junction temperature must remain below 125 °C under sustained load.

Does STM32L433VCT6 support external SMPS control?

Yes - it features dedicated VDD12 and VDDA12 pins to interface with external switching regulators, enabling 36 µA/MHz run-mode efficiency. The SMPS control logic is integrated into the power control block (PWR_CR4 register), allowing automatic voltage scaling and seamless transition between LDO and SMPS modes.

Can the LCD controller drive segment-based displays without external components?

Yes - the integrated LCD controller supports 8×40 or 4×44 static/dynamic segment driving with an on-chip step-up converter, eliminating need for external charge pumps or bias generators. Contrast is software-adjustable via the LCD_CR register, and COM/SEG outputs are directly routed to package pins PA0–PA7, PB0–PB7, PC0–PC7, and PD0–PD2.

Is USB full-speed operation possible without an external crystal?

Yes - the USB 2.0 full-speed interface includes a crystal-less mode using the internal 48 MHz oscillator with clock recovery system (CRS), achieving ±0.25% accuracy. This eliminates the 48 MHz crystal and associated layout area/cost while maintaining USB compliance per Section 3.33 of the datasheet.