{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74LS266N","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74LS266N","canonicalUrl":"https://icboms.com/texas-instruments/SN74LS266N","factsUrl":"https://icboms.com/api/mcp/products/SN74LS266N","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74LS series, Logic Type XNOR (Exclusive NOR), Open Collector, 4 Circuits, 2 Inputs, 4.75V ~ 5.25V supply, 0°C ~ 70°C operating temperature, 14-DIP (0.300\", 7.62mm) through-hole package.","salesMarkdown":"## Package and mounting The SN74LS266N is a quad 2-input XNOR (Exclusive NOR) gate from the 74LS family, with open-collector outputs — meaning the high side is floating and you pull it up externally. That open-collector stage lets you wire-OR multiple outputs onto a shared bus, which is the whole point of this part over a totem-pole XNOR. The 30 ns propagation delay at 5 V with a 15 pF load is typical for the LS family; it's fast enough for legacy 8-bit bus arbitration and comparator ladders, but you'll feel the difference if you're swapping in a 74F or 74ALS part without adjusting timing margins. ## Open collector: the gotcha and the advantage The output high, low current spec tells the story: the low side can sink 8 mA, but there's no rated high-side drive — that's the open-collector signature. You supply the pull-up resistor, and the value sets the rise time. For a 5 V rail at 8 mA sink, a 620 Ω pull-up gets you a clean edge, but the total current through all four gates sharing one resistor adds up fast. The quiescent supply current maxes at 13 mA for the whole package, so the power budget is modest. ## Supply voltage and input thresholds It runs on a 4.75 V to 5.25 V rail — classic 5 V TTL territory. The low-level input threshold is 0.8 V; high-level is 2 V. That means it's compatible with 3.3 V logic on the low side but won't reliably see a 3.3 V high as a logic 1. If you're mixing voltages, level-shift the high side or use a 5 V-tolerant driver. ## Package and temperature range for repair and new builds Housed in a 14-pin DIP with 0.300\" body width (14-PDIP), through-hole mounting. The operating temperature range is 0°C to 70°C — commercial grade, fine for benchtop equipment, industrial control cabinets, and consumer electronics, but not for under-hood or outdoor exposure. If you're reworking a board with a scorched DIP, this is the direct drop-in. ## Lifecycle and sourcing reality The SN74LS266N is listed as Active in the lifecycle status and ROHS3 compliant. For a 74LS part that's been around for decades, that's a solid sign that TI continues to run this die.","metaTitle":"SN74LS266N 74LS XNOR Gate, Open Collector, 30ns, 14-DIP","metaDescription":"Texas Instruments SN74LS266N quad 2-input XNOR gate with open-collector output. 4.75V-5.25V supply, 30ns propagation delay at 5V/15pF.","metaKeywords":null},"attributes":{"series":"74LS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Series":"74LS","Package":"Tube","Features":"Open Collector","Logic Type":"XNOR (Exclusive NOR)","Mounting Type":"Through Hole","Package / Case":"14-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Number of Inputs":"2","Voltage - Supply":"4.75V ~ 5.25V","Number of Circuits":"4","Operating Temperature":"0°C ~ 70°C","Input Logic Level - Low":"0.8V","Supplier Device Package":"14-PDIP","Input Logic Level - High":"2V","Current - Quiescent (Max)":"13 mA","Current - Output High, Low":"-, 8mA","Max Propagation Delay @ V, Max CL":"30ns @ 5V, 15pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.69","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.69000","currency":"USD"},{"qty":10,"price":"$1.51300","currency":"USD"},{"qty":25,"price":"$1.43640","currency":"USD"},{"qty":100,"price":"$1.18000","currency":"USD"},{"qty":250,"price":"$1.10304","currency":"USD"},{"qty":500,"price":"$0.97478","currency":"USD"},{"qty":1000,"price":"$0.76956","currency":"USD"},{"qty":2500,"price":"$0.72600","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/1e83bb1cb9e328e8cff29adbf30d3f0f.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74LS266N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74LS266N 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}}