{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LFE5U-85F-8BG381I","brand":"Lattice Semiconductor Corporation","brandSlug":"lattice-semiconductor-corporation","productSlug":"LFE5U-85F-8BG381I","canonicalUrl":"https://icboms.com/lattice-semiconductor-corporation/LFE5U-85F-8BG381I","factsUrl":"https://icboms.com/api/mcp/products/LFE5U-85F-8BG381I","rawCanonicalId":null},"summary":{"shortDescription":"Lattice Semiconductor ECP5 series FPGA, LFE5U-85F-8BG381I, 84000 logic elements, 205 I/O, 3833856 total RAM bits, 381-CABGA package, Tray.","salesMarkdown":"## 84K LUTs in a 17×17 mm CABGA — what the logic density means for your board The LFE5U-85F-8BG381I is a Lattice ECP5 FPGA packing 84,000 logic elements (LUTs) and 21,000 LABs/CLBs into a 381-ball CABGA package measuring 17×17 mm. That logic density — roughly 290 LUTs per mm² of package footprint — makes it a fit for mid-complexity glue logic, sensor fusion, or video bridging where you need more fabric than the 45K or 25K ECP5 siblings but can't move to a larger BGA. On-chip block RAM totals 3,833,856 bits (just under 4 Mbit), distributed across the LAB array. For a design that fits in the 84K LUT budget, the memory is sized for typical line buffers or FIFO depths — not enough for a full frame store at 1080p, but sufficient for a few scan lines or a small packet buffer. ## Package and reflow — what the 381-CABGA demands from the assembly line The 205 user I/O fan out to the outer ball rows; inner rows carry core supply and ground. Core supply tolerance is tight: 1.045 V to 1.155 V. That means a 1.1 V rail with ±5 % regulation — a standard POL regulator or LDO with 1 % set-point accuracy covers it, but a 1.0 V rail with ±10 % tolerance won't hold the upper limit. ## How it compares to the 45K and 25K ECP5 siblings The closest peer in the same CABGA footprint is the LFE5UM-45F-7BG381I: 44,000 logic elements (roughly half the fabric), 1,990,656 bits of block RAM, and 203 I/O. The 85K part gives you 1.9× the LUT count and 1.9× the RAM in the same 381-ball layout — a board designed for the 45K can accept the 85K if the power supply can deliver the higher core current and the thermal budget handles the extra dissipation. The 256-ball siblings (LFE5U-45F-7BG256I and LFE5U-25F-8BG256I) share the same 17×17 mm body but with 197 I/O and a different ball map — they are not footprint-compatible with the 381-ball parts. A board laid out for the 256-ball package cannot accept the 85F-8BG381I without a layout spin.","metaTitle":"LFE5U-85F-8BG381I Lattice ECP5 FPGA, 84K LUTs, 381-CABGA","metaDescription":"Lattice ECP5 FPGA LFE5U-85F-8BG381I, 84K logic elements, 205 I/O, 3.8 Mbit RAM, 381-CABGA, -40 to +100°C. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["FPGA / CPLD & Programmable Logic"],"specifications":{"Mfr":"Lattice Semiconductor Corporation","Series":"ECP5","Package":"Tray","Mounting Type":"Surface Mount","Number of I/O":"205","Package / Case":"381-FBGA","Product Status":"Active","Total RAM Bits":"3833856","lifecycle_stage":"unknown","Voltage - Supply":"1.045V ~ 1.155V","Base Product Number":"LFE5U-85","Number of LABs/CLBs":"21000","Operating Temperature":"-40°C ~ 100°C (TJ)","Supplier Device Package":"381-CABGA (17x17)","Number of Logic Elements/Cells":"84000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$90.8000","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/496575ee6a44fd98e19810ac630165b2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LFE5U-85F-8BG381I/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to LFE5U-85F-8BG381I?","answer":"The LFE5UM-45F-7BG381I is the nearest ECP5 peer in the same 381-CABGA package, but it has roughly half the logic fabric (44,000 vs 84,000 LUTs) and half the block RAM (1,990,656 vs 3,833,856 bits). A board designed for the 45K can accept the 85K if the power and thermal margins are adequate, but the 45K is not a functional replacement for an 85K design — the fabric is smaller."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/lattice-semiconductor-corporation/LFE5U-85F-8BG381I","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/lattice-semiconductor-corporation/LFE5U-85F-8BG381I 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}}