STMicroelectronics STM32L433CBT7

Overview

STM32L433CBT7 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 128 KB flash, 40 KB SRAM, and integrated LCD controller supporting 8×40 segments. It features USB FS (crystal-less), 2x 12-bit DACs, 1x 12-bit ADC (5 Msps), and operates from 1.71–3.6 V across –40 °C to 85 °C. It targets battery-powered portable medical devices requiring long runtime, precise analog sensing, and human-interface display.

For engineers reviewing the STM32L433CBT7 datasheet, STM32L433CBT7 pinout, STM32L433CBT7 application, or STM32L433CBT7 equivalent, key selection criteria include its 36 µA/MHz SMPS-enabled run mode, 28 nA standby current, LQFP48 package compatibility, and integrated LCD step-up converter for direct segment driving without external bias.

Technical Context

The STM32L433CBT7 implements 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 dual-voltage domain architecture supporting independent analog supply. Its FlexPowerControl system integrates multiple low-power modes-including Stop 2 (1.28 µA with RTC) and Shutdown (8 nA)-with 5 dedicated wakeup pins and 4 µs wake-up latency.

It embeds a full-featured clock system: dual PLLs (for system/USB/audio), auto-trimmed multispeed internal oscillator (±0.25%), 4–48 MHz external crystal support, and 32 kHz LSE for RTC calibration. The interconnect matrix enables concurrent peripheral access without bus contention, critical for real-time sensor fusion in constrained systems.

Key Specifications

Pinout & Package

LQFP48 package: 7 × 7 mm body, 0.5 mm pitch, exposed pad (EP) for thermal enhancement, RoHS-compliant and ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433RCT6, the CBT7 offers identical core performance and analog capability in a smaller LQFP48 package but fewer GPIOs; versus STM32L412KBU6, it adds LCD, USB, and richer analog integration at the cost of size and pin count-making it optimal for display-centric, battery-operated edge nodes.

Availability

STM32L433CBT7 is available at Aetrix Electronics and suitable for portable medical monitors, smart utility meters, industrial HMI panels, and wearable health trackers requiring stable component supply, long-term lifecycle assurance, and qualified sourcing.

Supply support for STM32L433CBT7 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, specializing in microcontrollers, power management, sensors, and automotive ICs.

The STM32L4 series is designed for ultra-low-power embedded applications demanding high performance-per-milliwatt, extended battery life, and rich analog/mixed-signal integration-targeting medical, metering, and portable industrial equipment.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L433CBT7 operates up to 80 MHz. In Run mode with ART Accelerator enabled and power supplied via external SMPS, it consumes 36 µA/MHz at 3.3 V-equating to approximately 2.88 mA total at full speed. This value is measured with code executing from flash, cache enabled, and prefetch disabled per DS11449 Rev 8 Table 27.

Does the STM32L433CBT7 support crystal-less USB Full-Speed operation?

Yes. The device integrates a clock recovery system (CRS) that synchronizes the internal 48 MHz RC oscillator to the USB SOF signal, enabling crystal-less USB 2.0 Full-Speed operation without external timing components. This is confirmed in Section 3.33 and Table 2 of the datasheet.

How many I/O pins are available in the LQFP48 package, and which are 5 V-tolerant?

The LQFP48 package provides 37 general-purpose I/O pins (PA0–PA15, PB0–PB15, PC0–PC15, PD2). Per Section 6.3.14 and Table 15 of DS11449 Rev 8, all GPIOs except those in the BOOT0 and NRST functions are 5 V-tolerant when configured in input, output, or alternate function modes.

What LCD configurations does the integrated controller support, and what external components are needed?

The LCD controller supports 8×40 or 4×44 segment formats with integrated step-up converter. No external bias generator or charge pump is required-the internal booster delivers up to 5.5 V from a 1.71–3.6 V supply. Only external COM/SEG traces and optional contrast-setting resistor are needed per Section 3.21 and Figure 137.