STMicroelectronics STM32L433VCI3

Overview

STM32L433VCI3 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 256 KB flash, 64 KB SRAM, and integrated LCD controller supporting 8×40 segments. It features USB FS (crystal-less), CAN 2.0B, and hardware-accelerated cryptographic services. Used in battery-powered medical wearables requiring long runtime, real-time sensor fusion, and segment-based display feedback.

For engineers reviewing the STM32L433VCI3 datasheet, STM32L433VCI3 pinout, STM32L433VCI3 application, or STM32L433VCI3 equivalent, key selection criteria include its 36 µA/MHz SMPS-run efficiency, 28 nA standby mode with RTC, 12-bit ADC at 5 Msps, and LQFP100 package compatibility with industrial-grade thermal performance up to +125 °C.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, coupled with 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 deterministic latency under mixed workloads.

Low-power operation is enforced via FlexPowerControl with seven distinct modes - including Stop 2 (1.28 µA with RTC) and Shutdown (8 nA) - each validated for specific peripheral retention and wakeup source configuration. The embedded 32 kHz LSE oscillator calibrates internal clock sources to ±0.25% accuracy, eliminating external timing components in cost-sensitive designs.

Key Specifications

Pinout & Package

LQFP100 package with 100 leads, 0.5 mm pitch, exposed thermal pad, RoHS-compliant and ECOPACK2 certified. Designed for reflow soldering and industrial PCB assembly with verified thermal resistance (θ_JA = 30 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L476VGT6 and STM32L552VET6, the STM32L433VCI3 uniquely balances ultra-low static current (28 nA), integrated LCD driver, and USB crystal-less capability - making it optimal for cost-constrained, battery-operated HMI devices where display integration and minimal BOM are critical.

Availability

STM32L433VCI3 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial HMI panels, and portable gas detectors requiring stable component supply across extended product lifecycles.

Supply support for STM32L433VCI3 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 analog products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per microwatt, with design emphasis on battery longevity, rich analog integration, and secure firmware execution in resource-constrained edge devices.

FAQ

What is the maximum operating temperature rating for STM32L433VCI3?

The STM32L433VCI3 is qualified for industrial operation up to +125 °C ambient temperature, validated per ST's specification DS11449 Rev 8 Section 6.3.1. This rating applies to the LQFP100 package variant and supports deployment in enclosed enclosures or high-temperature industrial environments without derating.

Does STM32L433VCI3 support hardware encryption acceleration?

Yes - it includes a true random number generator (RNG) compliant with NIST SP800-90B and supports AES-128/256 via software libraries leveraging its Cortex-M4 FPU and memory protection unit. While it lacks dedicated crypto co-processors like the L5 series, its ART Accelerator enables efficient cryptographic execution from flash with deterministic timing.

Can the LCD controller drive custom segment displays beyond 8×40?

No - the integrated LCD controller is fixed at 8 commons and 40 segments (or 4 commons and 44 segments). It does not support dot-matrix or graphical displays. For higher-resolution interfaces, external controllers or alternative MCUs with parallel RGB interfaces (e.g., STM32F7/F4 series) are required.

Is USB crystal-less operation supported in all power modes?

USB crystal-less functionality operates only in Run and Sleep modes. It is disabled in Stop, Standby, and Shutdown modes - consistent with USB specification requirements for bus enumeration and resume signaling. Applications requiring USB wakeup must use LPUART or EXTI pins instead.