{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY74FCT240TSOC","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CY74FCT240TSOC","canonicalUrl":"https://icboms.com/texas-instruments/CY74FCT240TSOC","factsUrl":"https://icboms.com/api/mcp/products/CY74FCT240TSOC","rawCanonicalId":null},"summary":{"shortDescription":"Cypress 74FCT series CY74FCT240TSOC, Buffer Inverting, 3-State output, 20-SOIC 7.50mm width, 4.75V-5.25V supply, 32mA/64mA output drive, -40°C to 85°C.","salesMarkdown":"## Dual 4-bit inverting buffer for 5 V bus isolation The CY74FCT240TSOC is a Cypress 74FCT-series dual 4-bit inverting buffer with 3-state outputs in a 20-SOIC package. The inverting logic and output-enable control make it a direct fit for 5 V backplane buffering, memory-address isolation, or general-purpose bus gating where the data path needs to be tri-stated during idle or test modes. ## 64 mA sink drive — sizing the fan-out The output drive capability is 32 mA source and 64 mA sink per channel. That sink current is the headline number for bus loading: it can drive the combined input capacitance of up to 10-15 standard 74-series loads on a backplane without signal degradation. For a 5 V TTL bus, the 64 mA sink handles the pull-down of heavily loaded lines, while the 32 mA source is adequate for driving CMOS inputs. Surface-mount 20-SOIC with 1.27 mm pitch — a straightforward hand-solder or reflow package. The 7.50 mm body width is the wider SOIC variant (SOIC-20W), not the narrow 300 mil body. Check your PCB footprint: the narrow 20-SOIC (208 mil body) is not pin-compatible. Supply decoupling: place a 0.1 µF ceramic within 5 mm of each VCC pin; the 5 V rail sees transient draw on output switching, and the 64 mA sink edges can couple noise into adjacent traces if decoupling is skimped.","metaTitle":"CY74FCT240TSOC Buffer, Inverting 3-State 20-SOIC, 32/64mA","metaDescription":"CY74FCT240TSOC 74FCT series inverting buffer with 3-state outputs. 32mA source, 64mA sink. 4.75V-5.25V supply. -40°C to 85°C. 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":"Buffer, Inverting","Output Type":"3-State","Mounting Type":"Surface Mount","Package / Case":"20-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.75V ~ 5.25V","Number of Elements":"2","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"20-SOIC","Current - Output High, Low":"32mA, 64mA","Number of Bits per Element":"4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.04","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.04000","currency":"USD"},{"qty":10,"price":"$0.92600","currency":"USD"},{"qty":25,"price":"$0.87840","currency":"USD"},{"qty":100,"price":"$0.72160","currency":"USD"},{"qty":250,"price":"$0.67460","currency":"USD"},{"qty":500,"price":"$0.59614","currency":"USD"},{"qty":1000,"price":"$0.47064","currency":"USD"},{"qty":2500,"price":"$0.44400","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/7573f3003978a23a0d87152fafe1f5ea.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the CY74FCT240TSOC obsolete?","answer":"It remains a viable production-part number for 5 V logic BOMs."},{"question":"What are the output current capabilities of CY74FCT240TSOC?","answer":"Each output can source 32 mA and sink 64 mA. The 64 mA sink current is the key rating for driving heavily loaded buses — it determines how many standard TTL inputs the buffer can fan out to without signal degradation."},{"question":"What is the CY74FCT240TSOC used for?","answer":"It is a dual 4-bit inverting buffer with 3-state outputs, used for 5 V bus isolation, memory-address buffering, and general-purpose signal gating where the outputs must be tri-stated when the bus is idle. Typical applications include backplane buffers in industrial control, telecom line cards, and test equipment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CY74FCT240TSOC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CY74FCT240TSOC 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}}