STMicroelectronics STM32L4R series, STM32L4R5ZIT6, 32-bit ARM Cortex-M4 MCU, 120 MHz, 2 MB Flash, 640 KB SRAM, 115 I/O, 144-LQFP, -40°C to 85°C.
| Parameter | Value |
|---|---|
| Series | STM32L4R |
| 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) | 115 |
| Core processor | ARM® Cortex®-M4 |
| Case | 144-LQFP |
| Data converters | A/D 16x12b; D/A 2x12b |
| Program memory size | 2MB (2M x 8) |
The 115 I/O pins in a 144-LQFP package give it the connectivity headroom for sensor arrays, external memory buses, or parallel display interfaces.
The STM32L4R5ZIT6 integrates a broad set of wired interfaces: CANbus, I²C, IrDA, LINbus, SAI, SPI, UART/USART, and USB OTG.
It is surface-mount and ships in tray form.
The core is an ARM Cortex-M4 running at 120 MHz. At this clock rate, the Flash requires zero wait states for most operations; the ART Accelerator handles instruction prefetch to keep the pipeline fed.
The STM32L151CBU6A is a lower-performance sibling — a Cortex-M3 at 32 MHz with 37 I/O and 128 KB Flash. It is not a pin-compatible or performance-equivalent second-source. For a direct STM32L4R-series alternate, look at the STM32L4R5xI density variants in the same 144-LQFP footprint.
Programming is done via the SWD (Serial Wire Debug) interface using a standard ST-Link/V2 or J-Link probe. The device boots from internal Flash with BOOT0 strapped low. The internal oscillator is enabled by default, so no external crystal is required for initial programming.
STMicroelectronics offers the NUCLEO-L4R5ZI and STM32L4R5I-DISCO discovery kit for this MCU family. Both boards expose the full I/O and include an integrated ST-Link debugger.