{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S102-ERN20-C2T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S102-ERN20-C2T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S102-ERN20-C2T","factsUrl":"https://icboms.com/api/mcp/products/LM3S102-ERN20-C2T","rawCanonicalId":null},"summary":{"shortDescription":"TI Stellaris LM3S102-ERN20-C2T, 32-bit ARM Cortex-M3 single-core, 20MHz, 8KB Flash, 2KB RAM, 18 I/O, I²C/SPI/UART, 3–3.6V supply, -40 to 105°C, 28-SOIC (Tape & Reel).","salesMarkdown":"The TI Stellaris LM3S102-ERN20-C2T is a 32-bit ARM Cortex-M3 single-core microcontroller running at 20 MHz, with 8 KB of Flash and 2 KB of RAM. It belongs to the Stellaris ARM Cortex-M3S 100 series and targets small embedded control tasks — think sensor polling, serial protocol bridging, or simple motor commutation. ## 20 MHz and 8 KB Flash — sizing the control loop The 20 MHz core clock with a single-cycle multiply puts this part in the small-control-loop tier. The 8 KB Flash holds roughly 2,000 to 3,000 instructions of compiled C code, so the firmware needs to be lean: no RTOS, no heavy libraries. The 2 KB RAM (organized as 2K x 8) is the tightest constraint — a single 1 KB buffer eats half of it. If your application fits that memory envelope, the part is a clean fit; if you are already bumping against the linker map, this is not the MCU to grow into. The LM3S102-ERN20-C2T carries an official lifecycle status of Obsolete. TI has ended production; there is no last-time-buy window still open. This part is no longer available through the factory-authorized channel. Availability is intermittent and depends on what stock remains in distribution channels worldwide. Sourcing is handled on a quoted-to-order basis — each lot is verified for authenticity and date code before it ships. ## 28-SOIC — rework-friendly footprint The 28-SOIC wide-body package (0.295-inch body width, 7.50 mm) is one of the most rework-friendly MCU packages in production. The 1.27 mm pitch leaves room for a fine-tip iron or hot-air nozzle to hit each pin without bridging. The leads are gull-wing, so visual inspection of the solder joint is straightforward. No exposed thermal pad underneath, so you do not need a stencil or a reflow profile for the pad.","metaTitle":"LM3S102-ERN20-C2T Stellaris ARM Cortex-M3 MCU, 20MHz","metaDescription":"TI Stellaris LM3S102-ERN20-C2T 32-bit ARM Cortex-M3 MCU at 20MHz with 8KB Flash, 2KB RAM, 18 I/O, I²C/SPI/UART, -40 to 105°C, 28-SOIC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"20MHz","title":"LM3S102-ERN20-C2T","Series":"Stellaris® ARM® Cortex®-M3S 100","Package":"Tape & Reel (TR)","RAM Size":"2K x 8","Core Size":"32-Bit Single-Core","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"I²C, Microwire, SPI, SSI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"18","Core Processor":"ARM® Cortex®-M3","Package / Case":"28-SOIC (0.295\\\", 7.50mm Width)","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S102","Program Memory Size":"8KB (8K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~105°C(TA)","Supplier Device Package":"28-SOIC","Voltage - Supply (Vcc/Vdd)":"3V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/23d05ab10bb41b40ecbd7351fdb7cc6b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is LM3S102-ERN20-C2T obsolete?","answer":"Yes, the LM3S102-ERN20-C2T is officially obsolete. TI has discontinued production with no last-time-buy window remaining."},{"question":"Is LM3S102-ERN20-C2T RoHS compliant?","answer":"The part is listed as Tape & Reel (TR) packaging, which typically indicates RoHS-compliant, lead-free finish for the Stellaris series, but the evidence does not carry an explicit RoHS compliance statement. Verify with the date code and lot-specific certificate of compliance at order time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S102-ERN20-C2T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S102-ERN20-C2T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}