{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74LS157N","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74LS157N","canonicalUrl":"https://icboms.com/texas-instruments/SN74LS157N","factsUrl":"https://icboms.com/api/mcp/products/SN74LS157N","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SN74LS157N, 74LS series, Multiplexer, 4 x 2:1 circuit, single 4.75V~5.25V supply, 0°C to 70°C, 16-DIP through-hole package.","salesMarkdown":"## What this 4 x 2:1 multiplexer is and where it fits The Texas Instruments SN74LS157N is a 74LS-series quad 2-input multiplexer that selects one of two 4-bit data sources. It is a single-supply device operating from 4.75V to 5.25V, in a 16-pin DIP through-hole package. This is the part you reach for when you need to route one of two 4-bit buses to a common output on a legacy 5V logic board — think industrial controller I/O muxing, address/data bus steering in old microprocessor systems, or any TTL-level signal selection where the board is built on through-hole and the environment stays inside a conditioned room. ## Output drive and what it means on a real board The output is rated for 400µA sourcing and 8mA sinking. That 8mA sink is enough to drive a standard TTL load or a low-current LED through a resistor, but do not expect to fan out to more than about ten 74LS inputs without buffering. The 400µA source side is the limiter — if you are driving a CMOS input with high impedance, fine; if you need to light an indicator or drive a relay coil, add a transistor or a buffer. On a field-service swap, I have seen this part work fine driving a 5V CMOS logic input on a PLC I/O card, but the moment someone tried to source 2mA into a optocoupler LED, the output voltage drooped and the logic level got marginal. ## Temperature range and where you can put it Rated 0°C to 70°C, this is a commercial-temperature part. It belongs in office equipment, lab instruments, indoor industrial control cabinets with HVAC, or any environment where the ambient stays above freezing and below a hot summer attic. Do not spec it for an engine bay, a rooftop telecom enclosure in Phoenix, or a freezer warehouse. If the board is going somewhere that sees -20°C or 85°C, you need the 74LS157's military or industrial temperature sibling. ## Lifecycle and sourcing reality The SN74LS157N is listed as Active in the lifecycle status. That means TI still manufactures it, and there is no announced end-of-life or last-time-buy window to chase. For a production BOM that needs this through-hole multiplexer, there is no rush to stockpile or qualify a drop-in replacement.","metaTitle":"SN74LS157N 74LS Multiplexer, 4 x 2:1, 16-DIP","metaDescription":"TI SN74LS157N 74LS multiplexer, 4 x 2:1 circuit, 4.75V-5.25V supply, 0°C to 70°C, 16-DIP through-hole.","metaKeywords":null},"attributes":{"series":"74LS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Multiplexer","Series":"74LS","Circuit":"4 x 2:1","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":"$0.92","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.92000","currency":"USD"},{"qty":10,"price":"$0.81200","currency":"USD"},{"qty":25,"price":"$0.76240","currency":"USD"},{"qty":100,"price":"$0.62220","currency":"USD"},{"qty":250,"price":"$0.57792","currency":"USD"},{"qty":500,"price":"$0.49184","currency":"USD"},{"qty":1000,"price":"$0.39347","currency":"USD"},{"qty":2500,"price":"$0.35658","currency":"USD"},{"qty":5000,"price":"$0.34800","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/cc7d377b82ea56b486be0f1e072d9f7e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SN74LS157N obsolete?","answer":"No, the SN74LS157N is listed as Active in the lifecycle status. TI continues to manufacture it, and there is no end-of-life notice or last-time-buy deadline in effect."},{"question":"What is the difference between 74LS157 and SN74LS157N?","answer":"The SN74LS157N is the specific TI part number for the 74LS157 function in a 16-pin DIP through-hole package. The base 74LS157 is the generic logic family function; the SN prefix indicates TI's standard logic prefix, and the N suffix designates the plastic DIP package. Other manufacturers may label their equivalent as DM74LS157N or MC74LS157N, but the function and pinout are identical across the 74LS family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74LS157N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74LS157N 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}}