{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"74F240SCX","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"74F240SCX","canonicalUrl":"https://icboms.com/texas-instruments/74F240SCX","factsUrl":"https://icboms.com/api/mcp/products/74F240SCX","rawCanonicalId":null},"summary":{"shortDescription":"Fairchild 74F Series 74F240SCX, Buffer/Inverting 3-State Octal 2-Element 4-Bit, 20-SOIC (0.295\", 7.50mm Width), Surface Mount, 4.5V to 5.5V Supply, 0°C to 70°C.","salesMarkdown":"## Octal inverting buffer with 64 mA sink — the bus-driving workhorse The Fairchild 74F240SCX is an octal inverting buffer with 3-state outputs, organized as two independent 4-bit elements. The headline spec is the asymmetric output drive: 3 mA source and 64 mA sink per output. That 64 mA sink capability is what sets this part apart — it can directly drive terminated backplane traces, relay coils, or LED arrays without an external transistor buffer. The inverting logic means a high on the input produces a low on the output, which matters when you are matching polarity to the downstream load. The 64 mA low-level output current handles terminated backplane traces with margin. ## 5 V only — no mixed-voltage trickery There is no 3.3 V operation, no 5 V tolerant inputs. If your system has a 3.3 V microcontroller talking to this buffer, you need a level translator on the input side. The 3-state outputs are controlled by two active-low output enable pins (one per 4-bit bank), which lets you tristate the bus during power sequencing or when another driver takes control. ## Commercial temperature, wide-body SOIC Package is 20-SOIC with 7.50 mm width. ## Lifecycle and compliance RoHS non-compliant (leaded solder finish).","metaTitle":"74F240SCX Buffer, Inverting 3-State 20-SOIC, 64mA Sink","metaDescription":"Fairchild 74F240SCX octal inverting buffer with 3-state outputs. 4.5V-5.5V supply, 64mA sink, 3mA source. 20-SOIC wide body. Active, RoHS non-compliant.","metaKeywords":null},"attributes":{"series":"74F","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"74F","Package":"Bulk","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":"4.5V ~ 5.5V","Number of Elements":"2","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"20-SOIC","Current - Output High, Low":"3mA, 64mA","Number of Bits per Element":"4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.37","stockQuantity":0,"priceTiers":[{"qty":802,"price":"$0.37000","currency":"USD"}]},"links":{"datasheetUrl":"https://rocelec.widen.net/view/pdf/rdekfuzce7/FAIRS24873-1.pdf?t.download=true&u=5oefqw","sourceUrl":null},"ai":{"faq":[{"question":"Is 74F240SCX RoHS compliant?","answer":"No, the 74F240SCX is listed as RoHS non-compliant. It uses leaded solder finish, which is permitted only under RoHS exemptions for certain military, medical, and high-reliability applications. If you need a RoHS-compliant part, check the lead-free suffix variant or a functionally equivalent 74F240 in a lead-free package."},{"question":"Can 74F240SCX be used as a substitute for 74LS240?","answer":"Yes, the 74F240 is a faster, higher-drive drop-in replacement for the 74LS240 in most 5 V logic systems. Both are octal inverting buffers with 3-state outputs in the same 20-pin wide-body SOIC footprint. The 74F240 offers significantly higher sink current (64 mA vs ~24 mA for LS) and faster propagation delay. The main consideration is supply current: the 74F family draws more ICC than LS, so verify your power budget. Pinout is identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/74F240SCX","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/74F240SCX 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}}