{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L4S9ZIY6TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L4S9ZIY6TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L4S9ZIY6TR","factsUrl":"https://icboms.com/api/mcp/products/STM32L4S9ZIY6TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L4S9ZIY6TR, ARM Cortex-M4 32-bit MCU, 120 MHz, 2 MB Flash, 640 KB SRAM, 112 I/O, 144-WLCSP, -40 to 85 °C, 1.71 V to 3.6 V.","salesMarkdown":"## 120 MHz Cortex-M4 with 2 MB Flash — the memory headroom this part brings The STM32L4S9ZIY6TR: It carries 2 MB of Flash and 640 KB of SRAM, which means you can hold a full application image plus an OTA staging buffer without external memory — a real BOM simplification for connected industrial or IoT edge nodes. The 112 I/O lines, combined with connectivity including CANbus, USB OTG, and multiple SPI/I²C/SAI interfaces, make it a fit for sensor fusion hubs, motor-control gateways, and human-machine interfaces where peripheral count matters. ## Package reality: 144-WLCSP The STM32L4S9ZIY6TR comes in a 144-WLCSP measuring 5.24x5.24 mm — a wafer-level chip-scale package with no leads, just solder balls on the underside. That footprint is about half the area of a comparable LQFP-144, which is the whole point: it fits where board space is tight. The trade-off is that WLCSP requires a controlled SMT process with proper stencil design and X-ray inspection after reflow. Rework is possible but needs a hot-air station with a fine nozzle and a preheat plate; the typical rework lab tech will want to verify the board's solder-mask-defined pad geometry before committing to a repair flow. The package is surface-mount only, and the 5.24 mm body means the mechanical stress from PCB flex is concentrated on the die itself — a stiffener or edge support in the enclosure is worth considering for high-vibration environments.","metaTitle":"STM32L4S9ZIY6TR STM32L4S ARM Cortex-M4 MCU, 120 MHz","metaDescription":"STMicroelectronics STM32L4S9ZIY6TR 32-bit ARM Cortex-M4 MCU at 120 MHz with 2 MB Flash, 640 KB SRAM, 112 I/O, 144-WLCSP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"STMicroelectronics","Speed":"120MHz","Series":"STM32L4S","Package":"Tape & Reel (TR); Cut Tape (CT)","RAM Size":"640K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, LCD, POR, PWM, WDT","Connectivity":"CANbus, EBI/EMI, I²C, IrDA, LINbus, MMC/SD, SAI, SPI, UART/USART, USB OTG","Mounting Type":"Surface Mount","Number of I/O":"112","Core Processor":"ARM® Cortex®-M4","Package / Case":"144-UFBGA, WLCSP","Product Status":"Active","Data Converters":"A/D 16x12b; D/A 2x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM32L4S9","Program Memory Size":"2MB (2M x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"144-WLCSP (5.24x5.24)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$21.3600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/801901ac73e8271122e5857a8f5a4736.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does STM32L4S9ZIY6TR have a DAC?","answer":"Yes, it includes two 12-bit DAC channels alongside a 16-channel 12-bit ADC, so analog output is available without an external converter for low-speed control loops or audio-level signals."},{"question":"Is STM32L4S9ZIY6TR pin-compatible with STM32L4S9ZIY6?","answer":"The base product number is STM32L4S9, and the suffix indicates the package variant. The STM32L4S9ZIY6TR is the tape-and-reel version of the 144-WLCSP package; the STM32L4S9ZIY6 (without the TR suffix) is the same die in the same WLCSP package but shipped in tray format. They are pin-compatible — the difference is only the shipping medium."},{"question":"What is the closest pin-compatible alternative in the STM32L4S family?","answer":"Within the STM32L4S series, devices sharing the same 144-WLCSP package and pinout are pin-compatible. The key differentiator is memory size and peripheral set — the STM32L4S9ZIY6TR sits at the top of the stack with 2 MB Flash and 640 KB SRAM. Lower-density siblings in the same package footprint trade Flash and SRAM for a lower BOM cost, but the pin mapping stays consistent across the family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L4S9ZIY6TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L4S9ZIY6TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T12:44:50.230Z","lastPublished":"2026-07-16T12:44:50.230Z","indexable":true}}