STM32L4R9ZIJ6
STM32L4R9ZIJ6 - 120MHz 2MB Cortex-M4 MCU | STMicroelectronics
The STMicroelectronics STM32L4R9ZIJ6 is a 32-bit Arm Cortex-M4 microcontroller operating up to 120 MHz, with 2 MB of Flash memory and a 144-pin UFBGA package measuring 10 mm by 10 mm. The verified distributor information identifies USB OTG and DFSD support, positioning this device for connected industrial, sensor, and embedded-control systems that combine substantial code storage with low-power microcontroller operation.
A microcontroller is a programmable system-on-chip that integrates a processor core, Flash program memory, data memory, peripherals, and communication interfaces on one package. STM32L4+ belongs to STMicroelectronics' ultra-low-power STM32L4 family. The Cortex-M4 core uses a 32-bit RISC architecture and provides the processing foundation for control loops, protocol handling, human-machine interfaces, and connected sensor nodes. Within the product hierarchy, this MCU combines embedded processing, low-power management, and extensive digital peripherals.
The verified data highlights three primary attributes: a 120 MHz maximum clock, 2 MB of Flash memory, and a 144-UFBGA package. Mouser additionally identifies USB OTG and DFSD functionality, while the LCSC listing identifies a 3.3 V device supplied in a tray. These features support firmware-heavy applications requiring high code density, peripheral connectivity, and a compact surface-mount footprint. Package dimensions and ball-level routing must still be checked against the manufacturer pinout before layout release.
The STM32L4R9ZIJ6 is based on the STM32L4+ device family, whose members target ultra-low-power embedded applications. At the system level, the microcontroller executes application code, manages sensors and actuators, and bridges communications between local control hardware and external equipment. The exact SRAM capacity, voltage range, GPIO count, analog features, operating-temperature limits, and low-power current figures were not included in the supplied verified excerpts and therefore remain unverified here.
Typical design targets include industrial sensor nodes, USB-connected data loggers, compact industrial controllers, asset-tracking equipment, and low-power monitoring systems. A DFSD-capable variant can support workflows involving removable storage when the associated peripheral, filesystem, electrical requirements, and board support package are implemented correctly. USB OTG can support peripheral or host roles when the selected role, power configuration, routing, and firmware stack are appropriate.
Engineers should assign power, ground, decoupling, clock, programming, and debug pins strictly from the official STM32L4R9ZI documentation. BGA routing requires fine-pitch layout rules, controlled impedance where applicable, and assembly capability appropriate to the 10 mm by 10 mm UFBGA footprint. Before substituting any device, verify ball mapping, voltage domains, peripheral availability, bootloader behavior, memory organization, and production software support rather than relying only on nominal CPU speed.
This page combines verified manufacturer and distributor information with explicit engineering gaps, package guidance, sourcing questions, and decision criteria. It distinguishes confirmed characteristics from unverified parameters and explains why a nominal Cortex-M4 match is insufficient to establish a true drop-in replacement. That engineering distinction is essential for this high-pin-count, finely balled MCU package.
USD $15,71
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