{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S6618-IQC50-A2T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S6618-IQC50-A2T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S6618-IQC50-A2T","factsUrl":"https://icboms.com/api/mcp/products/LM3S6618-IQC50-A2T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 6000 series LM3S6618-IQC50-A2T, 32-bit MCU, 50 MHz, 128 KB Flash, 32K x 8 SRAM, Ethernet MAC+PHY, 8x10-bit ADC, 38 I/O, 100-LQFP, -40 to 85°C.","salesMarkdown":"## What this Stellaris MCU brings to an industrial Ethernet node The 8-channel 10-bit ADC and 38 general-purpose I/O lines handle local sensor acquisition and actuator control alongside the Ethernet stack. TI formally discontinued the Stellaris line after acquiring Luminary Micro; no official direct replacement exists within the current TI portfolio. Any new design should look at current Cortex-M4 or M7 parts with integrated Ethernet, such as the TM4C129 series (also from TI), but those require a board respin due to different pinout and peripheral map. ## 50 MHz core and 128 KB Flash — sizing the firmware budget The 50 MHz Cortex-M3 delivers about 1.25 DMIPS/MHz, or roughly 62 DMIPS total — enough for a lightweight TCP/IP stack (lwIP or uIP) plus a Modbus/TCP or EtherNet/IP adapter application without CPU saturation. The 128 KB Flash is the hard limit for the combined bootloader, protocol stack, and application image; if your firmware exceeds 120 KB after compression, you will need a larger-Flash sibling (the LM3S6918, also 128 KB but with more RAM) or a different family. The 32 KB SRAM leaves about 20 KB for packet buffers and runtime data after the stack overhead, so avoid jumbo-frame or high-throughput logging without external SRAM. ## Ethernet MAC+PHY — no external PHY needed The integrated Ethernet MAC and PHY is the differentiator. It supports 10/100 Mbps with auto-negotiation and a Media Independent Interface (MII) that also allows an external PHY if needed. The internal PHY saves board area and BOM cost, but the analogue portion is sensitive to supply noise — keep the 2.5 V analogue rail clean with a ferrite bead and 10 µF cap near the VDDA pin, as recommended in the Stellaris reference design. The Ethernet block also includes a dedicated DMA controller that offloads packet handling from the CPU. This is unusual — most Cortex-M3 MCUs run at 3.3 V or 1.8 V core with 3.3 V I/O. ## Industrial temperature range — rated for the factory floor The 100-LQFP package is a standard JEDEC outline, so rework with a hot-air station is straightforward — no BGA underfill or X-ray inspection needed.","metaTitle":"LM3S6618-IQC50-A2T Stellaris ARM Cortex-M3 MCU, 50 MHz","metaDescription":"LM3S6618-IQC50-A2T Stellaris ARM Cortex-M3 MCU at 50 MHz with 128 KB Flash, 32 KB SRAM, Ethernet MAC+PHY, 8x10-bit ADC. Industrial temp range -40 to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"Texas Instruments","Speed":"50MHz","Series":"Stellaris® ARM® Cortex®-M3S 6000","Package":"Tape & Reel (TR)","RAM Size":"32K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"Ethernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"38","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 8x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S6618","Program Memory Size":"128KB (128K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"100-LQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"2.25V ~ 2.75V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$25.8800","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S6618-IQC50-A2T/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy LM3S6618-IQC50-A2T?","answer":"Submit an RFQ for current availability and pricing — quotes are confirmed at order time against our multi-supplier network."},{"question":"Is LM3S6618-IQC50-A2T obsolete?","answer":"Yes, the LM3S6618-IQC50-A2T is listed as obsolete by Texas Instruments. No official direct replacement exists; any remaining stock is available through surplus channels."},{"question":"Does LM3S6618-IQC50-A2T have Ethernet?","answer":"Yes, it integrates a 10/100 Mbps Ethernet MAC and PHY, so no external PHY chip is needed for a wired network connection."},{"question":"What is the replacement for LM3S6618-IQC50-A2T?","answer":"TI does not list an official drop-in replacement. For new designs, consider the TM4C129 series (Cortex-M4F with Ethernet) or the LM3S6918 (same Flash, more RAM, same package), but both require a board layout change — the pinout is not identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S6618-IQC50-A2T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S6618-IQC50-A2T 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}}