{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TMS27C291-3JL","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TMS27C291-3JL","canonicalUrl":"https://icboms.com/texas-instruments/TMS27C291-3JL","factsUrl":"https://icboms.com/api/mcp/products/TMS27C291-3JL","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TMS27C291-3JL EPROM - UV, 16Kbit (2K x 8), Parallel, 35 ns, 24-DIP (0.600\", 15.24mm) Window, Through Hole, Bulk.","salesMarkdown":"## Still in active production — what that means for a legacy BOM Texas Instruments lists the TMS27C291-3JL as Active, so it remains a supported production part for existing designs that require a 16 Kbit UV-erasable EPROM in a 24-pin DIP. ## 35 ns access time — the speed that sets the CPU wait-state budget A CPU or DSP that clocks above ~28 MHz typically inserts one or more wait states to meet this timing — the exact count depends on the memory controller's setup and hold margins. Organised as 2K x 8 bits (16 Kbit total), the parallel interface presents a byte-wide data bus with standard address lines, making it a direct drop-in for 8-bit microcontroller or ASIC memory maps that expect a 24-pin DIP EPROM. ## Windowed 24-DIP — the UV-erasable reality The 24-DIP (0.600-inch, 15.24 mm) windowed package lets UV light reach the die for erasure. This is the classic EPROM form factor — the quartz window requires an opaque label in-system to prevent data corruption from ambient light, and reprogramming needs a UV eraser unit, not in-circuit programming. The Bulk packaging means the parts ship in tubes or trays, not tape-and-reel — expected for a through-hole DIP that runs through wave solder or hand-solder stations, not reflow. ## RoHS non-compliant — legacy tin-lead finish Texas Instruments lists the TMS27C291-3JL as RoHS non-compliant, confirming a tin-lead (SnPb) solder finish on the leads. This is the expected plating for an EPROM from this era — it mates with standard SnPb wave-solder profiles and is exempt from RoHS restrictions in military, aerospace, and certain medical applications where leaded solder is still permitted.","metaTitle":"Texas Instruments TMS27C291-3JL EPROM, 16 Kbit, 35 ns","metaDescription":"Active Texas Instruments TMS27C291-3JL 16 Kbit UV EPROM, 35 ns access time, parallel interface, 24-DIP windowed package. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Technology":"EPROM - UV","Access Time":"35 ns","Memory Size":"16Kbit","Memory Type":"Non-Volatile","Memory Format":"EPROM","Mounting Type":"Through Hole","Package / Case":"24-DIP (0.600\\\", 15.24mm) Window","lifecycle_stage":"eol_hot","Memory Interface":"Parallel","Voltage - Supply":"4.75V ~ 5.25V","Memory Organization":"2K x 8","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"24-DIP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.4","stockQuantity":0,"priceTiers":[{"qty":41,"price":"$7.40000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/756bb241e0e0ed80f4f7d8b33eb6ab3c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What compliance documentation does Texas Instruments provide for the TMS27C291-3JL?","answer":"The TMS27C291-3JL is RoHS non-compliant (tin-lead finish). Texas Instruments provides standard datasheet and product change notification (PCN) documentation for this active part. No REACH, UL, or IEC certification is listed on the product record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TMS27C291-3JL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TMS27C291-3JL 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}}