{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74LS51N","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74LS51N","canonicalUrl":"https://icboms.com/texas-instruments/SN74LS51N","factsUrl":"https://icboms.com/api/mcp/products/SN74LS51N","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SN74LS51N, 74LS series, dual 2-wide 2-input AND-OR-INVERT gate, 14-DIP (0.300\", 7.62mm) through-hole package, 4.75V to 5.25V supply, 0°C to 70°C operating temperature.","salesMarkdown":"## What the SN74LS51N is and where it fits The Texas Instruments SN74LS51N is a dual 2-wide 2-input AND-OR-INVERT gate from the 74LS low-power Schottky logic family. It integrates two independent circuits, each implementing the logic function (A AND B) OR (C AND D) then inverted, in a single 14-pin DIP package. This combinational gate is used for glue logic in 5V TTL systems — decoding, gating, or combining digital signals in legacy telecom, industrial controllers, test equipment, and prototyping boards where through-hole assembly is preferred. ## Output drive and fan-out The output is single-ended with a rated sink current of 8 mA and source current of 400 µA. The asymmetric drive is typical of 74LS: the output can sink a standard TTL load (one or two LS inputs) but sources very little. When driving a high-impedance CMOS input or an LED, use an external pull-up resistor or a buffer. The 400 µA source limit also means the high-level output voltage droops under even light loading — check the fan-out table in the datasheet if you are driving more than 10 LS loads. ## Active production — sourcing reality The SN74LS51N carries an Active lifecycle status. That said, 74LS is a mature logic family, and TI has consolidated production over the years — lead times and allocation can shift. We source this part through independent distribution, with each unit traceable back to the authorized chain.","metaTitle":"SN74LS51N 74LS AND-OR-INVERT Gate, 14-DIP, 5V Supply","metaDescription":"SN74LS51N dual 2-wide 2-input AND-OR-INVERT gate in 14-DIP. 74LS series, 5V supply, commercial temp.","metaKeywords":null},"attributes":{"series":"74LS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Series":"74LS","Package":"Tube","Logic Type":"AND/OR/INVERT Gate","Output Type":"Single-Ended","Mounting Type":"Through Hole","Package / Case":"14-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Number of Inputs":"10 Input (3, 3, 2, 2)","Voltage - Supply":"4.75V ~ 5.25V","Number of Circuits":"2","Operating Temperature":"0°C ~ 70°C","Schmitt Trigger Input":"No","Supplier Device Package":"14-PDIP","Current - Output High, Low":"400µA, 8mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.65","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.65000","currency":"USD"},{"qty":10,"price":"$1.47600","currency":"USD"},{"qty":25,"price":"$1.40080","currency":"USD"},{"qty":100,"price":"$1.15070","currency":"USD"},{"qty":250,"price":"$1.07568","currency":"USD"},{"qty":500,"price":"$0.95060","currency":"USD"},{"qty":1000,"price":"$0.75048","currency":"USD"},{"qty":2500,"price":"$0.70800","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/1b04ed38f6444072eafcd7ca13ce0329.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the output current ratings for SN74LS51N?","answer":"The output can sink 8 mA and source 400 µA. The high-level source current is limited, so driving more than a few LS inputs or any CMOS input without a pull-up may degrade the logic-high voltage."},{"question":"What is the difference between SN74LS51N and 74LS51?","answer":"SN74LS51N is the full Texas Instruments order code for the 74LS51 dual AND-OR-INVERT gate in a 14-pin PDIP package. 74LS51 is a generic family designation; the exact part may come from different manufacturers with slight variations in package or temperature grade. The SN74LS51N is the TI-specified variant with commercial temperature range and through-hole DIP."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74LS51N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74LS51N 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}}