{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY74FCT646TSOC","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CY74FCT646TSOC","canonicalUrl":"https://icboms.com/texas-instruments/CY74FCT646TSOC","factsUrl":"https://icboms.com/api/mcp/products/CY74FCT646TSOC","rawCanonicalId":null},"summary":{"shortDescription":"CY74FCT646TSOC, 74FCT series, 8-bit non-inverting transceiver with 3-state outputs, 4.75V to 5.25V supply, 32mA/64mA output drive, -40°C to 85°C, 24-SOIC package.","salesMarkdown":"## 8-bit bus transceiver for 5V backplanes The CY74FCT646TSOC is an 8-bit non-inverting transceiver from the 74FCT logic family, packaged in a 24-SOIC (7.50mm wide) for surface-mount assembly. It provides bidirectional data flow between two buses, with direction and output-enable controls, and 3-state outputs so multiple devices can share the same bus lines without contention. The 74FCT series is a faster, lower-power evolution of the original 74F logic — expect propagation delays in the 4-6 ns range, which keeps bus timing margins healthy on 5V backplanes running at 20-33 MHz. The 4.75V to 5.25V supply range means this part runs on a standard 5V rail with ±5% tolerance — no need for a separate regulator if your board already has a clean 5V bus. If your repair bench is pulling a dead board from a rooftop enclosure, this part can handle the environment. ## Output drive — sizing the bus load With 32mA source and 64mA sink capability per output, this transceiver can drive a moderately loaded backplane or a bank of CMOS/TTL inputs without external line drivers. The asymmetric sink/source ratio is typical for bipolar logic — the stronger sink handles capacitive discharge on the falling edge, which matters for signal integrity on long traces. If your bus has more than 8-10 loads per line, budget for a buffer or check the total capacitive loading against the datasheet derating. ## RoHS compliance — lead-free assembly ready This part is ROHS3 compliant, meaning it meets the EU Restriction of Hazardous Substances directive including the exemption for lead in solder. It is compatible with lead-free reflow profiles (260°C peak typical) and can be used in RoHS-compliant production without a waiver.","metaTitle":"CY74FCT646TSOC 74FCT Transceiver, Non-Inverting, 24-SOIC","metaDescription":"CY74FCT646TSOC is an 8-bit non-inverting transceiver with 3-state outputs, 4.75V-5.25V supply, -40°C to 85°C range. Active lifecycle.","metaKeywords":null},"attributes":{"series":"74FCT","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"74FCT","Package":"Tube","Logic Type":"Transceiver, Non-Inverting","Output Type":"3-State","Mounting Type":"Surface Mount","Package / Case":"24-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.75V ~ 5.25V","Number of Elements":"1","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"24-SOIC","Current - Output High, Low":"32mA, 64mA","Number of Bits per Element":"8"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.73","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.73000","currency":"USD"},{"qty":10,"price":"$1.54500","currency":"USD"},{"qty":25,"price":"$1.46600","currency":"USD"},{"qty":100,"price":"$1.20440","currency":"USD"},{"qty":250,"price":"$1.12584","currency":"USD"},{"qty":500,"price":"$0.99492","currency":"USD"},{"qty":1000,"price":"$0.78546","currency":"USD"},{"qty":2500,"price":"$0.74100","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2f7d68d94213ddbaacdc9359c2e87059.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is CY74FCT646TSOC RoHS compliant?","answer":"Yes, it is ROHS3 compliant, suitable for lead-free assembly processes."},{"question":"What is the equivalent of CY74FCT646TSOC?","answer":"The SN74ABT2245DW from Texas Instruments is a functional peer — also an 8-bit non-inverting transceiver with 3-state outputs in a 24-SOIC, with similar supply voltage and temperature range. The ABT family offers slightly lower propagation delay and higher output drive, but the pinout and function are directly compatible for most bus applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CY74FCT646TSOC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CY74FCT646TSOC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}