{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MSP430F2121IDW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"MSP430F2121IDW","canonicalUrl":"https://icboms.com/texas-instruments/MSP430F2121IDW","factsUrl":"https://icboms.com/api/mcp/products/MSP430F2121IDW","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments MSP430F2xx series 16-bit microcontroller, MSP430F2121IDW, 16 MHz, 4KB Flash, 256 x 8 RAM, 16 I/O, 20-SOIC wide, -40 to 85°C.","salesMarkdown":"## 4 KB Flash, 256 B RAM — the firmware budget for a single-loop controller The MSP430F2121IDW packs 4 KB of program Flash and 256 bytes of RAM (organized as 256 x 8) on a 16-bit MSP430 CPU16 core clocked at 16 MHz. That memory ceiling means this part fits a single control loop — a temperature sensor reading, a PWM output, and a UART debug line — without room for a full RTOS or a large lookup table. The 256-byte RAM is the real constraint: it holds about 128 16-bit variables. If your application needs a 100-sample moving-average buffer, that alone consumes 200 bytes, leaving 56 bytes for stack and globals. Consider external serial SRAM or a part with more SRAM if your data set exceeds this. ## Industrial temp grade and on-chip supervision for unattended gear The on-chip brown-out reset (BOR) and power-on reset (POR) eliminate the need for an external supervisor IC — the part holds the core in reset until the supply rail stabilises above 1.8 V. The internal oscillator (no external crystal needed) and the integrated watchdog timer (WDT) further reduce BOM count for a sealed, battery-powered node. ## 20-SOIC wide — a legacy footprint that still fits through-hole rework Housed in a 20-SOIC wide-body package (7.50 mm width, 1.27 mm pitch), the MSP430F2121IDW uses a footprint that predates QFN and QFP trends. The 1.27 mm pitch is hand-solderable and inspectable under a standard loupe — a practical choice for prototype runs or field repairs where rework stations are limited. The wide body also means the thermal pad is absent; all heat dissipates through the leads, so no copper pour underneath is needed. The 20-pin count yields 16 general-purpose I/O lines. With the slope A/D converter sharing one pin and the internal oscillator freeing two crystal pins, you get 14 usable GPIOs for pushbuttons, LED drivers, and sensor interrupts — enough for a keypad-and-display front panel, but tight for parallel bus interfaces. ## Active lifecycle — no LTB clock ticking yet The base product number MSP430F2121 tells you this is the 4 KB Flash, 256 B RAM member of the F2xx family. If your firmware outgrows 4 KB, the pin-compatible MSP430F2131 (8 KB Flash) or MSP430F2410 (16 KB Flash) in the same 20-SOIC footprint are natural upgrades — confirm the RAM size scales accordingly.","metaTitle":"Texas Instruments MSP430F2121IDW 16-bit MCU, 4KB Flash","metaDescription":"Active-production MSP430F2121IDW from Texas Instruments: 16 MHz 16-bit MCU with 4KB Flash, 256B RAM, 16 GPIOs in 20-SOIC. Industrial temp -40°C to 85°C. ROHS3.","metaKeywords":null},"attributes":{"series":"MSP430F2xx","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"Texas Instruments","Speed":"16MHz","Series":"MSP430F2xx","Package":"Tube","RAM Size":"256 x 8","Core Size":"16-Bit","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"-","Mounting Type":"Surface Mount","Number of I/O":"16","Core Processor":"MSP430 CPU16","Package / Case":"20-SOIC (0.295\\\", 7.50mm Width)","Product Status":"Active","Data Converters":"Slope A/D","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"MSP430F2121","Program Memory Size":"4KB (4K x 8 + 256B)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"20-SOIC","Voltage - Supply (Vcc/Vdd)":"1.8V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.3400","priceTiers":[{"qty":1,"price":"$3.34000","currency":"USD"},{"qty":10,"price":"$3.00200","currency":"USD"},{"qty":25,"price":"$2.83760","currency":"USD"},{"qty":100,"price":"$2.45930","currency":"USD"},{"qty":250,"price":"$2.33320","currency":"USD"},{"qty":500,"price":"$2.09360","currency":"USD"},{"qty":1000,"price":"$1.76568","currency":"USD"},{"qty":2500,"price":"$1.67740","currency":"USD"},{"qty":5000,"price":"$1.61434","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/915f3387ecbce04a8fd7c7e9a4da9617.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MSP430F2121IDW/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to MSP430F2121IDW — can I use F280041PZQR instead?","answer":"No — the F280041PZQR is a 32-bit C2000 C28x core MCU running at 100 MHz with a different voltage domain (1.14 V core), a 32-pin QFN package, and automotive AEC-Q100 qualification. It is not pin-compatible with the 20-SOIC MSP430F2121IDW, and the peripheral set (CAN, LIN, 12-bit ADC) targets motor-control applications rather than the low-power sensor-node role of the MSP430. A board redesign would be required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/MSP430F2121IDW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/MSP430F2121IDW when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}