{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MSP430G2121IRSA16R","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"MSP430G2121IRSA16R","canonicalUrl":"https://icboms.com/texas-instruments/MSP430G2121IRSA16R","factsUrl":"https://icboms.com/api/mcp/products/MSP430G2121IRSA16R","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments MSP430G2xx series 16-bit MCU, MSP430G2121IRSA16R, 16 MHz, 1 KB Flash, 128 x 8 RAM, I²C/SPI, 10 I/O, 16-VQFN exposed pad, -40°C to 85°C.","salesMarkdown":"## 128 B RAM — sizing the firmware budget The 128 x 8 RAM is the real constraint on this part. It limits the call stack depth and the size of runtime buffers, so firmware needs to be lean — think single-variable control loops, not multi-frame packet handling. The 1 KB Flash can hold a modest interrupt-driven I²C or SPI slave routine plus a state machine, but leave no room for OTA staging or a full bootloader. For designs that need more headroom, the MSP430G2xx family offers pin-compatible parts with up to 8 KB Flash and 512 B RAM, but the 128 B RAM here keeps the die small and the active current low. ## 16-VQFN with exposed pad — rework considerations The part comes in a 16-VQFN exposed-pad package (4x4 mm body). The QFN is reworkable with hot air if you pre-bake the board (MSL level not stated, but assume MSL 3 as typical for this package class). The 16-QFN footprint is shared across the MSP430G2xx family, so a board designed for this part can also accept higher-memory siblings without layout changes.","metaTitle":"TI MSP430G2121IRSA16R 16-bit MCU, 16 MHz, 1 KB Flash","metaDescription":"Texas Instruments MSP430G2121IRSA16R 16-bit MCU with 16 MHz core, 1 KB Flash, 128 B RAM, industrial temp -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"Texas Instruments","Speed":"16MHz","Series":"MSP430G2xx","Package":"Tape & Reel (TR); Cut Tape (CT)","RAM Size":"128 x 8","Core Size":"16-Bit","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"I²C, SPI","Mounting Type":"Surface Mount","Number of I/O":"10","Core Processor":"MSP430 CPU16","Package / Case":"16-VQFN Exposed Pad","Product Status":"Active","Data Converters":"-","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"MSP430G2121","Program Memory Size":"1KB (1K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"16-QFN (4x4)","Voltage - Supply (Vcc/Vdd)":"1.8V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7459","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/dcffd4e87ef2e9a7c45ca4c675b25e04.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MSP430G2121IRSA16R/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to MSP430G2121IRSA16R?","answer":"Within the MSP430G2xx family, parts with higher Flash and RAM (e.g., MSP430G2231 with 2 KB Flash, 128 B RAM, or MSP430G2452 with 8 KB Flash, 512 B RAM) share the same 16-QFN package and pinout. They are drop-in replacements on the same board layout, offering more firmware headroom at a slightly higher unit cost. The trade-off is active current — larger Flash arrays draw a few microamps more in sleep mode."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/MSP430G2121IRSA16R","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/MSP430G2121IRSA16R when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}