{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74166N3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74166N3","canonicalUrl":"https://icboms.com/texas-instruments/SN74166N3","factsUrl":"https://icboms.com/api/mcp/products/SN74166N3","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SN74166N3, 8-bit parallel-in serial-out shift register, DIP package, Bulk, RoHS non-compliant, active lifecycle.","salesMarkdown":"## 8-bit parallel-load shift register — what the function means for the BOM The SN74166N3 is an 8-bit parallel-in, serial-out shift register from Texas Instruments' 74-series TTL logic family. It loads eight parallel data bits on a single clock edge and shifts them out serially on the next eight clock cycles — a standard building block for expanding microcontroller inputs, scanning switch matrices, or capturing parallel data over a single-wire serial link. The '166 function is the same as the classic 74166, but the 'N3 suffix indicates a specific package and lead-finish variant that is RoHS non-compliant, so it belongs on BOMs that either require legacy tin-lead plating or carry an explicit RoHS exemption for leaded solder. The RoHS non-compliant flag is the main planning constraint — if your assembly line has moved entirely to lead-free reflow, this part requires either a segregated wave-solder step or a qualified exemption. ## Package and mounting — through-hole DIP, Bulk shipment the SN74166N3 comes in a standard DIP body — the same 16-pin 0.3-inch-wide footprint used by the 74166 and most 74-series 16-pin logic. No moisture-sensitivity bake is required for a hermetic DIP, but standard ESD handling applies.","metaTitle":"SN74166N3 8-bit shift register, parallel-in serial-out, DIP","metaDescription":"SN74166N3 8-bit parallel-in serial-out shift register. Active lifecycle, RoHS non-compliant.","metaKeywords":null},"attributes":{"series":"*","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Series":"*","Package":"Bulk","lifecycle_stage":"eol_hot"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.72","stockQuantity":0,"priceTiers":[{"qty":419,"price":"$0.72000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/cff25012e60aeb03ee0125d7e043ede0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between SN74166N3 and SN74166N?","answer":"The 'N3 suffix typically denotes a specific lead-finish or packaging variant within the same DIP footprint. The SN74166N3 is RoHS non-compliant (tin-lead plating), while the base SN74166N may be the RoHS-compliant version. Functionally both are 8-bit parallel-in serial-out shift registers with the same pinout and logic, so they are interchangeable in a circuit — the choice comes down to your assembly's solder alloy requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74166N3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74166N3 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}}