STMicroelectronics STM32L4S series, STM32L4S5QII6, 32-Bit Single-Core ARM Cortex-M4 MCU, 120 MHz, 2 MB FLASH, 640K x 8 RAM, 110 I/O, CANbus, USB OTG, 132-UFBGA, -40°C to 85°C.
| Parameter | Value |
|---|---|
| Series | STM32L4S |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 1.71V ~ 3.6V |
| Operating temperature | -40°C ~ 85°C (TA) |
| Speed | 120MHz |
| Package | Tray |
| RAM size | 640K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Connectivity | CANbus, EBI/EMI, I²C, IrDA, LINbus, MMC/SD, SAI, SPI, UART/USART, USB OTG |
| Number of i (O) | 110 |
| Core processor | ARM® Cortex®-M4 |
| Case | 132-UFBGA |
| Data converters | A/D 16x12b; D/A 2x12b |
| Program memory size | 2MB (2M x 8) |
Internal oscillator and brown-out detect/reset are integrated, reducing external BOM count.
The 132-UFBGA package measures 7 mm x 7 mm with a 0.5 mm ball pitch. Surface-mount assembly requires a solder-paste stencil aligned to the ball pattern; X-ray inspection is recommended after reflow to check for head-in-pillow defects. Decouple the Vcc supply with a 100 nF capacitor per supply pin pair, placed as close to the balls as the fan-out vias allow.
Yes, the connectivity block includes USB OTG alongside CANbus, I²C, SPI, UART/USART, SAI, and an EBI/EMI interface.
The core processor runs at 120 MHz, which is the maximum clock speed for this ARM Cortex-M4 device.
The STM32L151CBU6A is a lower-performance ARM Cortex-M3 sibling in the STM32L1 family, running at 32 MHz with 37 I/O. It is not a pin-compatible second source — the STM32L4S5QII6 offers a 120 MHz Cortex-M4 core, 2 MB Flash, 640 KB SRAM, and 110 I/O in a 132-UFBGA package, which is a different performance and footprint tier.