{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74AS27D","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74AS27D","canonicalUrl":"https://icboms.com/texas-instruments/SN74AS27D","factsUrl":"https://icboms.com/api/mcp/products/SN74AS27D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74AS series, NOR Gate, SN74AS27D, 3 circuits, 3 inputs per gate, 14-SOIC surface mount, 4.5V to 5.5V supply, 5.5ns propagation delay.","salesMarkdown":"## What the 5.5 ns propagation delay means for your timing budget The SN74AS27D is a triple 3-input NOR gate from TI's 74AS family, packing three independent NOR functions into a single 14-SOIC package. The headline spec is the 5.5 ns max propagation delay at 5 V into a 50 pF load — that is the time from any input crossing the threshold to the output settling. In a 5 V logic system clocked at 50 MHz (20 ns period), this delay eats about 27% of the cycle, so the downstream register must account for the skew. The input thresholds are TTL-compatible: 0.8 V low, 2.0 V high. That means it will reliably interpret a 3.3 V signal as a logic high as long as the high-level voltage exceeds 2.0 V, but the low-level noise margin is only 0.8 V below a 1.2 V ground bounce. ## Active production and compliance — no LTB pressure No stock-holding claim; we quote per RFQ.","metaTitle":"SN74AS27D Texas Instruments 74AS NOR Gate, 3-Circuit","metaDescription":"SN74AS27D TI 74AS triple 3-input NOR gate in 14-SOIC. Active production, ROHS3 compliant. 4.5-5.5V supply, 5.5ns propagation delay. Sourced to order.","metaKeywords":null},"attributes":{"series":"74AS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Series":"74AS","Package":"Tube","Logic Type":"NOR Gate","Mounting Type":"Surface Mount","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Number of Inputs":"3","Voltage - Supply":"4.5V ~ 5.5V","Number of Circuits":"3","Operating Temperature":"0°C ~ 70°C","Input Logic Level - Low":"0.8V","Supplier Device Package":"14-SOIC","Input Logic Level - High":"2V","Current - Output High, Low":"2mA, 20mA","Max Propagation Delay @ V, Max CL":"5.5ns @ 5V, 50pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.64","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.64000","currency":"USD"},{"qty":10,"price":"$1.47800","currency":"USD"},{"qty":25,"price":"$1.39400","currency":"USD"},{"qty":100,"price":"$1.18760","currency":"USD"},{"qty":250,"price":"$1.11512","currency":"USD"},{"qty":500,"price":"$0.97572","currency":"USD"},{"qty":1000,"price":"$0.80846","currency":"USD"},{"qty":2500,"price":"$0.78900","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b289572428cf3d2b43da000714014306.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How can I order the SN74AS27D or check availability?","answer":"The SN74AS27D is an active Texas Instruments part, sourced to order through independent distribution."},{"question":"Will the SN74AS27D drop into a board designed for the SN74HC27APWR without rewiring?","answer":"Both are 14-SOIC triple 3-input NOR gates, so the footprint is the same — 14-SOIC, 1.27 mm pitch. But the supply voltage and speed class differ. The SN74HC27APWR runs on 2 V to 6 V and has a 15 ns propagation delay at 6 V, while the SN74AS27D needs a 5 V ±10 % rail and switches in 5.5 ns. If the board already has a regulated 5 V supply and the timing margin closes with the faster delay, the swap is pin-compatible. If the board uses a 3.3 V rail, the AS part will not work because its minimum supply is 4.5 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74AS27D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74AS27D when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}