{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74F521DW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74F521DW","canonicalUrl":"https://icboms.com/texas-instruments/SN74F521DW","factsUrl":"https://icboms.com/api/mcp/products/SN74F521DW","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74F series Identity Comparator, SN74F521DW, 8-bit, Active Low output, 20-SOIC (0.295\", 7.50mm Width), 4.5V ~ 5.5V supply, 0°C ~ 70°C.","salesMarkdown":"## 8-bit identity comparator in 20-SOIC The SN74F521DW is an 8-bit identity comparator from the 74F logic family, packaged in a 20-SOIC (0.295\", 7.50mm width) surface-mount package. It compares two 8-bit words and asserts the output when all bits match. The output is active low (A=B), meaning the output goes low when the two 8-bit inputs are identical. This is the standard polarity for cascading multiple comparators in a wider word-width system. ## Speed and drive for bus matching The 74F family's faster switching compared to the 74LS or 74HC series means the SN74F521DW can keep up with higher-speed processor buses without adding wait states. Output drive capability is 1 mA source (high) and 20 mA sink (low). The asymmetric drive is typical for TTL-compatible outputs; the 20 mA sink handles standard TTL fan-out of 10 loads, while the 1 mA source is sufficient for driving CMOS inputs or pull-up resistors. This covers standard 5 V logic rails in indoor equipment — benchtop instruments, telecom line cards, and industrial control boards that stay within a conditioned environment. ## Active production and compliance The tube packaging is the factory-default for SOIC-20; reels are available through distribution on request.","metaTitle":"SN74F521DW Texas Instruments 8-bit Identity Comparator","metaDescription":"SN74F521DW 8-bit identity comparator from TI, 74F series, active-low output, 10ns propagation delay, 4.5-5.5V supply, 20-SOIC.","metaKeywords":null},"attributes":{"series":"74F","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"Identity Comparator","Output":"Active Low","Series":"74F","Package":"Tube","Mounting Type":"Surface Mount","Number of Bits":"8","Package / Case":"20-SOIC (0.295\\\", 7.50mm Width)","Output Function":"A=B","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Operating Temperature":"0°C ~ 70°C","Supplier Device Package":"20-SOIC","Current - Output High, Low":"1mA, 20mA","Max Propagation Delay @ V, Max CL":"10ns @ 5V, 50pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.90000","currency":"USD"},{"qty":10,"price":"$0.80700","currency":"USD"},{"qty":25,"price":"$0.76560","currency":"USD"},{"qty":100,"price":"$0.62900","currency":"USD"},{"qty":250,"price":"$0.58800","currency":"USD"},{"qty":500,"price":"$0.51962","currency":"USD"},{"qty":1000,"price":"$0.41022","currency":"USD"},{"qty":2500,"price":"$0.38700","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/176d2b5a2b10247b7009edf3b6625da2.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the propagation delay of SN74F521DW?","answer":"Maximum propagation delay is 10 ns at 5 V supply with a 50 pF load. This is the time from input change to valid output for the A=B condition, and it determines the maximum bus speed at which the comparator can operate without violating setup times."},{"question":"What compliance documentation does Texas Instruments provide for SN74F521DW?","answer":"The SN74F521DW is ROHS3 compliant. Texas Instruments provides the standard compliance documentation including the ROHS certificate of compliance and material declaration. No additional UL or IEC certification is listed for this standard logic part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74F521DW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74F521DW 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}}