STMicroelectronics STM32L433CBY6TR

Overview

STM32L433CBY6TR 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 delivers 36 µA/MHz in SMPS-run mode, 280 nA Standby with RTC, and supports capacitive touch sensing for battery-powered portable instrumentation.

For engineers reviewing the STM32L433CBY6TR datasheet, STM32L433CBY6TR pinout, STM32L433CBY6TR application, or STM32L433CBY6TR equivalent, key selection criteria include ultra-low-power mode timing (4 µs wakeup), LCD drive capability (8×40 segments), and dual 12-bit DAC + 12-bit ADC (5 Msps) performance in constrained energy budgets.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, paired with a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture includes dual-regulator support (LDO/SMPS), batch acquisition mode (BAM), and five low-power modes - Shutdown (8 nA), Standby (28 nA), Stop 2 (1.28 µA with RTC), and Run (36 µA/MHz @ 3.3 V SMPS).

Clock system comprises two PLLs (system/USB/audio), internal 48 MHz RC with clock recovery, and multiple oscillators (4–48 MHz HSE, 32 kHz LSE, 16 MHz HSI ±1%). Analog subsystem includes one 12-bit ADC (5 Msps, hardware oversampling to 16-bit), two 12-bit DACs, one op-amp with PGA, and two ultra-low-power comparators - all supplied independently for noise isolation.

Key Specifications

Pinout & Package

STM32L433CBY6TR is housed in a 64-ball Ultra-Fine Pitch Ball Grid Array (UFBGA64, package code A019), measuring 5 mm × 5 mm with 0.5 mm ball pitch and ECOPACK2 compliance. Pin functions are validated per STMicroelectronics DS11449 Rev 8, Section 4 (Pinouts and pin description), Table 15 (STM32L433xx pin definitions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KCU6, STM32L433CBY6TR adds LCD, SMPS, and 192 KB more flash - justifying its use in display-centric, battery-optimized systems; versus STM32L476RGY6, it trades memory and temperature rating for lower static power and smaller footprint in cost-sensitive portable designs.

Availability

STM32L433CBY6TR is available at Aetrix Electronics and suitable for portable medical monitors, smart utility meters, industrial handheld terminals, and low-power environmental sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32L433CBY6TR 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 automotive semiconductors.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per microwatt, with emphasis on battery-operated wearables, metering, and IoT edge nodes requiring long service life and rich peripheral integration.

FAQ

What is the maximum operating frequency and core type of STM32L433CBY6TR?

The STM32L433CBY6TR features an Arm Cortex-M4 core with FPU, rated for up to 80 MHz operation and delivering 100 DMIPS. It uses ST's ART Accelerator™ to achieve zero-wait-state execution from internal flash memory, ensuring deterministic real-time performance without external memory.

Does STM32L433CBY6TR support crystal-less USB Full-Speed operation?

Yes - STM32L433CBY6TR integrates a clock recovery system (CRS) that enables certified crystal-less USB 2.0 Full-Speed operation using PA11/PA12 pins. This eliminates the need for an external 48 MHz crystal, reducing BOM cost and PCB area while maintaining USB compliance.

What LCD configurations does STM32L433CBY6TR support, and what is required externally?

The device supports 8×40 or 4×44 segment LCDs with integrated step-up converter. Only the LCD glass and contrast-setting resistor are needed externally; no external bias supply or driver IC is required. PF9–PF15 and PC7–PC10 serve as segment/common outputs with programmable duty/cycle control.

How does the power architecture of STM32L433CBY6TR differ between LDO and SMPS modes?

In LDO mode, the internal linear regulator supplies VDD from VDDA, drawing 84 µA/MHz. In SMPS mode, an external DC-DC converter supplies VDD12 (1.1 V), reducing active current to 36 µA/MHz - a 57% improvement. The MCU directly controls SMPS enable and feedback via dedicated pins (VDD12, VDD12_SENS, SMPS_EN).