{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TMS27PC256-15NE","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TMS27PC256-15NE","canonicalUrl":"https://icboms.com/texas-instruments/TMS27PC256-15NE","factsUrl":"https://icboms.com/api/mcp/products/TMS27PC256-15NE","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TMS27PC256-15NE OTP ROM, 32KX8, 150NS, PDIP28, Bulk.","salesMarkdown":"## 256 Kbit OTP ROM, 150 ns, PDIP28 The Texas Instruments TMS27PC256-15NE is a 256 Kbit (32K x 8) one-time programmable (OTP) ROM with a 150 ns access time, housed in a 28-pin PDIP package. This is a factory-programmed memory — the OTP array is written during manufacturing and cannot be erased or rewritten in the field. The 150 ns access time sets the read-cycle ceiling for the bus it connects to — a microcontroller or ASIC with a memory controller that expects sub-100 ns access may need wait states inserted to meet the timing. For legacy 8- or 16-bit systems that were designed around 150 ns EPROMs, this is a direct drop-in. ## Active production, RoHS non-compliant Note that this part is RoHS non-compliant (leaded solder terminations). For BOMs that require RoHS compliance, a lead-free alternative would need a board-spin or a different package variant — this is a legacy part intended for existing designs that tolerate tin-lead solder. ## What it swaps into on site The PDIP28 package is socket-friendly — it can be swapped in the field with a standard IC puller and a DIP socket, no hot-air station needed. Pin 1 orientation is marked by a notch and a dot on the package body; the socket orientation is unambiguous as long as the notch aligns with the socket's key. Because it is OTP, there is no UV-erase window — the package is solid epoxy, which makes it more mechanically robust than a ceramic-window EPROM for field handling. No special ESD precautions beyond the usual bench mat are required, though the part is CMOS and sensitive to latch-up if input voltages exceed the supply rails.","metaTitle":"Texas Instruments TMS27PC256-15NE OTP ROM, 32Kx8, 150ns","metaDescription":"Texas Instruments TMS27PC256-15NE OTP ROM, 256 Kbit (32K x 8), 150 ns access, PDIP28. Active production. RoHS non-compliant. Quoted to order.","metaKeywords":null},"attributes":{"series":"*","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Series":"*","Package":"Bulk","lifecycle_stage":"eol_hot"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.31","priceTiers":[{"qty":130,"price":"$2.31000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0ff15dd18b95659787a25d0f0c56607c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TMS27PC256-15NE/alternatives.json"},"ai":{"faq":[{"question":"What is the access time and organization of the TMS27PC256-15NE?","answer":"It is a 256 Kbit OTP ROM organized as 32K words by 8 bits, with a 150 ns access time. The PDIP28 package is pin-compatible with standard 28-pin EPROMs of the same density."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TMS27PC256-15NE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TMS27PC256-15NE 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}}