{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74LS640-1DW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74LS640-1DW","canonicalUrl":"https://icboms.com/texas-instruments/SN74LS640-1DW","factsUrl":"https://icboms.com/api/mcp/products/SN74LS640-1DW","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74LS series SN74LS640-1DW, Octal Inverting Transceiver, 3-State Outputs, 15 mA / 48 mA drive, 4.75 V – 5.25 V supply, 20-SOIC, 0°C to 70°C.","salesMarkdown":"## Octal inverting bus transceiver — active 74LS logic The SN74LS640-1DW is an octal (8-bit) inverting bus transceiver from the 74LS logic family. It provides bidirectional data flow between two buses with 3-state outputs, and the data is inverted at each direction. The output drive is rated 15 mA high-level and 48 mA low-level. That 48 mA sink capability is typical of 74LS and gives you solid fan-out to multiple LSTTL loads or a terminated backplane. The 15 mA source is modest — plan for it when driving LED indicators or long traces without a pull-up. Fine for office equipment, appliances, test gear, and rack-mounted telecom that stays climate-controlled. ## 20-SOIC footprint — wide-body surface mount Packaged in a 20-SOIC wide-body (7.50 mm width) case. The wide body gives better thermal dissipation than the narrow SOIC for the same pin count. Surface-mount only — no through-hole version of this exact code. Listed as Active in the product lifecycle. This is a current-production part, not a phase-out. No second-source listed in the official cross-reference, but the 74LS family is widely second-sourced by multiple manufacturers — verify pin-compatibility with your specific alternate.","metaTitle":"SN74LS640-1DW 74LS Inverting Transceiver, 20-SOIC, Active","metaDescription":"TI SN74LS640-1DW 74LS octal inverting transceiver with 3-state outputs. 15 mA source, 48 mA sink, 4.75 V–5.25 V supply. 20-SOIC. Active lifecycle.","metaKeywords":null},"attributes":{"series":"74LS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"74LS","Package":"Tube","Logic Type":"Transceiver, 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":"1","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"20-SOIC","Current - Output High, Low":"15mA, 48mA","Number of Bits per Element":"8"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.04","priceTiers":[{"qty":1,"price":"$2.04000","currency":"USD"},{"qty":10,"price":"$1.83100","currency":"USD"},{"qty":25,"price":"$1.72800","currency":"USD"},{"qty":100,"price":"$1.47210","currency":"USD"},{"qty":250,"price":"$1.38224","currency":"USD"},{"qty":500,"price":"$1.20946","currency":"USD"},{"qty":1000,"price":"$1.00212","currency":"USD"},{"qty":2500,"price":"$0.97800","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/296d9486f6e297130953e9032e85d6b4.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74LS640-1DW/alternatives.json"},"ai":{"faq":[{"question":"What is the function of SN74LS640-1DW?","answer":"It is an octal (8-bit) inverting bus transceiver with 3-state outputs. It allows bidirectional data transfer between two buses while inverting the logic level, controlled by direction and output-enable pins."},{"question":"What is the difference between SN74LS640-1DW and SN74LS640-1DWR?","answer":"The suffix 'R' typically denotes a different packaging or reel option (e.g., Tape & Reel vs Tube). The SN74LS640-1DW ships in Tube form. The die and functional specs are identical."},{"question":"What are equivalent or alternate parts for SN74LS640-1DW?","answer":"A direct functional alternative is the SN74LS645-1N, which is a non-inverting transceiver in a through-hole package. For a surface-mount inverting part, the 74LS640 family has multiple speed grades; the -1DW is the standard speed variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74LS640-1DW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74LS640-1DW 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}}