{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74HCT640N","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74HCT640N","canonicalUrl":"https://icboms.com/texas-instruments/SN74HCT640N","factsUrl":"https://icboms.com/api/mcp/products/SN74HCT640N","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HCT SN74HCT640N, 8-bit bus transceiver with inverting 3-state outputs, DIP-20, Bulk, RoHS non-compliant.","salesMarkdown":"## 8-bit bus transceiver with inverted data paths The key twist here is the inverting outputs — data that goes in on the A side comes out inverted on the B side, and vice versa. That makes it a direct swap for the 74HCT245 only if your board expects inverted logic; otherwise you'll get a bus fight. The DIP-20 package is through-hole, so it's a natural fit for legacy boards, breadboards, or rework where you're replacing a scorched IC on a controller board that still uses leaded solder. ## Leaded finish — RoHS non-compliant But it's listed as RoHS non-compliant, meaning the leads are tin/lead (SnPb) finish, not Pb-free. If your assembly line is RoHS-mandated, this part won't pass; you'd need to look at a Pb-free equivalent like the SN74HCT640N's leaded sibling or a different package variant. For legacy repair work or mil/aero builds that still use SnPb solder, this is exactly what you want — no reliability surprises from mixed metallurgy. ## Bulk packaging — plan your handling If you're feeding a pick-and-place machine, you'll need to transfer the parts to tube feeders or hand-place them. For bench rework or low-volume production, bulk is fine — just be aware of ESD handling: the DIP-20 body is large enough to handle with tweezers, but the leads are delicate, so avoid bending them during insertion.","metaTitle":"SN74HCT640N 74HCT 8-bit bus transceiver, inverting, DIP-20","metaDescription":"Texas Instruments SN74HCT640N 8-bit bus transceiver with inverting 3-state outputs. Active lifecycle, RoHS non-compliant (leaded).","metaKeywords":null},"attributes":{"series":"74HCT","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"74HCT","Package":"Bulk","lifecycle_stage":"eol_hot"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0","priceTiers":[{"qty":362,"price":"$1.00000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/90686c40268a5569a4d60f85d7986fb7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74HCT640N/alternatives.json"},"ai":{"faq":[{"question":"What are equivalents of SN74HCT640N?","answer":"The closest functional equivalent is the 74ACT16833DL, which is also an 8-bit bus transceiver but from the 74ACT family — faster, with tighter timing. Neither is a pin-for-pin replacement; verify the pinout and logic polarity before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74HCT640N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74HCT640N when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}