{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MM74HC257J","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"MM74HC257J","canonicalUrl":"https://icboms.com/texas-instruments/MM74HC257J","factsUrl":"https://icboms.com/api/mcp/products/MM74HC257J","rawCanonicalId":null},"summary":{"shortDescription":"Fairchild MM74HC257J, 74HC series, Type Multiplexer, Circuit 4 x 2:1, Voltage - Supply 2V ~ 6V, Single Supply, Operating Temperature -55°C ~ 125°C, Current - Output High, Low 7.8mA, 7.8mA, Package Bulk.","salesMarkdown":"## What the MM74HC257J is and where it fits The Fairchild MM74HC257J is a 74HC-series quad 2-input multiplexer with a single supply range of 2V to 6V. It routes one of two 4-bit data sources to a common output, controlled by a select line and an output-enable gate. The -55°C to 125°C temperature range suits it for military, avionics, and industrial control environments where the board sees wide thermal cycling. The 7.8 mA output drive at both high and low states is typical for HC logic — enough to drive a CMOS load or a single TTL gate, but not a long backplane trace without a buffer. ## RoHS status — plan for leaded assembly This part is marked RoHS non-compliant. It is acceptable for builds where leaded solder is permitted. ## Lifecycle and sourcing posture No official successor is listed. The DIP package may have thinner availability than surface-mount variants. ## Output drive — what 7.8 mA means for the load The 7.8 mA output high and low current is the rated sink/source capability at the rated output voltage.","metaTitle":"MM74HC257J Multiplexer, 4 x 2:1, 2V~6V, -55°C~125°C","metaDescription":"MM74HC257J is a 74HC-series 4 x 2:1 multiplexer from Fairchild. Operates on 2V~6V single supply, -55°C~125°C. Active, RoHS non-compliant.","metaKeywords":null},"attributes":{"series":"74HC","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Multiplexer","Series":"74HC","Circuit":"4 x 2:1","Package":"Bulk","lifecycle_stage":"eol_hot","Voltage - Supply":"2V ~ 6V","Independent Circuits":"1","Operating Temperature":"-55°C ~ 125°C","Voltage Supply Source":"Single Supply","Current - Output High, Low":"7.8mA, 7.8mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.13","stockQuantity":0,"priceTiers":[{"qty":265,"price":"$1.13000","currency":"USD"}]},"links":{"datasheetUrl":"https://rocelec.widen.net/view/pdf/0x6hkphnqd/NATLS02002-1.pdf?t.download=true&u=5oefqw","sourceUrl":null},"ai":{"faq":[{"question":"What is the function of MM74HC257J?","answer":"It is a 4-bit 2-input multiplexer (4 x 2:1). It selects one of two 4-bit data buses and routes the chosen bus to the output, controlled by a single select line and an output-enable input."},{"question":"What is the closest functional second-source — SN74LS348N?","answer":"The SN74LS348N is a priority encoder (1 x 8:3), not a multiplexer. It is not a functional replacement for the MM74HC257J. For a second-source multiplexer, look at the 74HC257 from TI, NXP, or other manufacturers in the same DIP package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/MM74HC257J","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/MM74HC257J 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}}