{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"74FCT521CTPYG","brand":"Renesas Electronics","brandSlug":"renesas","productSlug":"74FCT521CTPYG","canonicalUrl":"https://icboms.com/renesas/74FCT521CTPYG","factsUrl":"https://icboms.com/api/mcp/products/74FCT521CTPYG","rawCanonicalId":null},"summary":{"shortDescription":"Renesas Electronics 74FCT series Identity Comparator, 74FCT521CTPYG, 8-bit, Active Low output, 4.5ns propagation delay, 20-SSOP package, Surface Mount.","salesMarkdown":"## 8-bit identity match at 4.5 ns The 74FCT521CTPYG is an 8-bit identity comparator from the 74FCT series, built to compare two 8-bit words and pull the output low when they match. The 4.5 ns max propagation delay at 5 V, 50 pF load means it resolves a match within one fast clock cycle — useful in address decoding, cache tag comparison, or any bus where the match decision must settle before the next rising edge. The active-low output (A=B) is the signal that goes low on a match. In a typical memory-mapped I/O decode, this output enables the chip-select line directly without an extra inverter. The 15 mA source / 48 mA sink drive capability on the output is enough to drive a few CMOS loads or a single TTL input without a buffer. ## Supply, temperature, and package fit The 10 µA quiescent current means it adds negligible static draw to the board, which matters in a multi-card chassis where every milliamp counts toward the PSU budget.","metaTitle":"74FCT521CTPYG Identity Comparator, 8-bit, 4.5ns, SSOP-20","metaDescription":"Renesas 74FCT521CTPYG 8-bit identity comparator, 4.5ns propagation delay, active-low output, 20-SSOP. Active production, ROHS3 compliant. Sourced to order.","metaKeywords":null},"attributes":{"series":"74FCT","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"Identity Comparator","Output":"Active Low","Series":"74FCT","Package":"Bulk","Mounting Type":"Surface Mount","Number of Bits":"8","Package / Case":"20-SSOP (0.209\\\", 5.30mm Width)","Output Function":"A=B","lifecycle_stage":"eol_hot","Voltage - Supply":"4.75V ~ 5.25V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"20-SSOP","Current - Quiescent (Iq)":"10 µA","Current - Output High, Low":"15mA, 48mA","Max Propagation Delay @ V, Max CL":"4.5ns @ 5V, 50pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.29","stockQuantity":0,"priceTiers":[{"qty":1031,"price":"$0.29000","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the 74FCT521CTPYG used for?","answer":"It is an 8-bit identity comparator — it compares two 8-bit words and drives the output low when they are equal. Typical uses include address decoding in microprocessor systems, cache tag comparison, and any logic circuit that needs a fast match detection on a bus."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/renesas/74FCT521CTPYG","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/renesas/74FCT521CTPYG when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}