{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74LS42N","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74LS42N","canonicalUrl":"https://icboms.com/texas-instruments/SN74LS42N","factsUrl":"https://icboms.com/api/mcp/products/SN74LS42N","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74LS series Decoder/Demultiplexer, SN74LS42N, 1 x 4:10 circuit, Through Hole, 16-DIP (0.300\", 7.62mm), 4.75V ~ 5.25V supply, 0°C ~ 70°C.","salesMarkdown":"The Texas Instruments SN74LS42N is a 1-of-10 BCD-to-decimal decoder/demultiplexer from the 74LS Schottky TTL family. It takes a 4-bit BCD input and asserts one of ten active-low outputs, making it the standard part for driving numeric displays, selecting memory banks, or routing control signals in 5V logic systems. The 16-pin DIP package suits through-hole assembly and rework-friendly boards. The 4.75V to 5.25V supply range means this part expects a regulated 5V rail — not a loosely-tolerated bus. ## Output drive and loading Output high current is 400µA, output low sinks 8mA — standard LS TTL drive levels. Each output can drive one or two standard 74LS inputs directly, but fan-out beyond that needs a buffer. If your design routes this decoder to a bus with multiple loads, budget a 74LS244 or similar line driver on the outputs. ## Lifecycle and supply reality For a legacy 74LS BOM line, this is a stable fit.","metaTitle":"Texas Instruments SN74LS42N Decoder/Demultiplexer, 1x4:10","metaDescription":"SN74LS42N 1-of-10 BCD decoder/demultiplexer from TI 74LS family. 4.75V–5.25V supply, 400µA/8mA drive, 0°C–70°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":"74LS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Type":"Decoder/Demultiplexer","Series":"74LS","Circuit":"1 x 4:10","Package":"Tube","Mounting Type":"Through Hole","Package / Case":"16-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.75V ~ 5.25V","Independent Circuits":"1","Operating Temperature":"0°C ~ 70°C","Voltage Supply Source":"Single Supply","Supplier Device Package":"16-PDIP","Current - Output High, Low":"400µA, 8mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.03","priceTiers":[{"qty":1,"price":"$3.03000","currency":"USD"},{"qty":10,"price":"$2.72000","currency":"USD"},{"qty":25,"price":"$2.57120","currency":"USD"},{"qty":100,"price":"$2.22820","currency":"USD"},{"qty":250,"price":"$2.11396","currency":"USD"},{"qty":500,"price":"$1.89684","currency":"USD"},{"qty":1000,"price":"$1.61700","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a59fb1154c5969d6cf3df8b8e7689124.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74LS42N/alternatives.json"},"ai":{"faq":[{"question":"What is the function of the SN74LS42N?","answer":"The SN74LS42N is a 1-of-10 BCD-to-decimal decoder/demultiplexer. It accepts a 4-bit BCD input (0000 through 1001) and asserts the corresponding output line low — output 0 for input 0000, output 1 for 0001, and so on up to output 9. Inputs above 1001 (1010–1111) produce no asserted output; all outputs remain high. This makes it the standard decoder for 7-segment displays, memory chip selects, or any application needing to map a 4-bit code to one of ten control lines."},{"question":"Can SN74LS42N be used as a demultiplexer in a 74LS logic design?","answer":"Yes. The SN74LS42N functions as a 1-line-to-10-line demultiplexer when the data input is applied to the A input (LSB) and the strobe or address lines are driven from the other three inputs. The active-low outputs route the inverted data to the selected line. It works directly with other 74LS family parts on a shared 5V rail, though the 400µA/8mA drive limits fan-out to one or two standard LS loads per output."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74LS42N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74LS42N 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}}