{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74ALS27AD","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74ALS27AD","canonicalUrl":"https://icboms.com/texas-instruments/SN74ALS27AD","factsUrl":"https://icboms.com/api/mcp/products/SN74ALS27AD","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SN74ALS27AD, Series 74ALS, Logic Type NOR Gate, 3 Circuits, 3 Inputs, 14-SOIC (0.154\", 3.90mm Width), Surface Mount, 0°C ~ 70°C, 15ns @ 5V, 50pF max propagation delay.","salesMarkdown":"## What the 15 ns propagation delay means for your bus The SN74ALS27AD is a triple 3-input NOR gate from TI's 74ALS family, in a 14-SOIC package. The headline number is 15 ns max propagation delay at 5 V and 50 pF load. ## Output drive and what it can actually sink The output is rated for 400 µA source and 8 mA sink. That 8 mA sink is enough to drive four standard LSTTL loads but won't directly light an LED or drive a relay coil without a transistor buffer. ## Supply and temperature — where it fits Runs on a 4.5 V to 5.5 V supply, so it's strictly a 5 V rail part.","metaTitle":"SN74ALS27AD TI 74ALS Triple 3-Input NOR Gate, 15 ns SOIC-14","metaDescription":"SN74ALS27AD Texas Instruments 74ALS triple 3-input NOR gate. 15 ns prop delay at 5V, 50 pF. 4.5-5.5V supply, 0-70°C. Active production, ROHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":"74ALS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"74ALS","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":"400µA, 8mA","Max Propagation Delay @ V, Max CL":"15ns @ 5V, 50pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.58","priceTiers":[{"qty":1,"price":"$1.58000","currency":"USD"},{"qty":10,"price":"$1.42100","currency":"USD"},{"qty":25,"price":"$1.34080","currency":"USD"},{"qty":100,"price":"$1.14240","currency":"USD"},{"qty":250,"price":"$1.07272","currency":"USD"},{"qty":500,"price":"$0.93864","currency":"USD"},{"qty":1000,"price":"$0.77772","currency":"USD"},{"qty":2500,"price":"$0.75900","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2674413fcc5ec2acc104c53f9bbd67b8.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74ALS27AD/alternatives.json"},"ai":{"faq":[{"question":"How does SN74ALS27AD compare to the 74LS27?","answer":"The ALS series is faster (15 ns vs about 18-22 ns for LS) and uses less power per gate. Pin-compatible and a direct drop-in replacement for most 74LS27 sockets, provided the supply is 5 V."},{"question":"Is there a direct replacement for SN74ALS27AD?","answer":"No official TI second-source is listed, but the SN74F27NSR (74F27) is a pin-compatible, faster alternative (5 ns propagation delay) with the same logic function and supply range."},{"question":"What is the pinout of SN74ALS27AD?","answer":"Standard 14-pin SOIC pinout for a triple 3-input NOR gate. Pins 1, 2, 13 are inputs for gate 1; pin 12 is output. Pins 3, 4, 5 for gate 2; pin 6 output. Pins 9, 10, 11 for gate 3; pin 8 output. Pin 7 is GND, pin 14 is VCC. The datasheet has the full diagram."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74ALS27AD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74ALS27AD 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}}