{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74S138AD","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74S138AD","canonicalUrl":"https://icboms.com/texas-instruments/SN74S138AD","factsUrl":"https://icboms.com/api/mcp/products/SN74S138AD","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74S series Decoder/Demultiplexer, type 1 x 3:8, 16-SOIC surface mount, 4.75V ~ 5.25V supply, 0°C ~ 70°C operating temperature.","salesMarkdown":"## What the 1 x 3:8 configuration means for your address decode The SN74S138AD is a single 3-line to 8-line decoder/demultiplexer in the 74S Schottky family — the 'S' process gives faster propagation delays than the standard 74LS, which matters when the address lines feed into a memory chip-select tree that must settle within the read cycle window. With one independent circuit decoding three inputs into eight mutually exclusive active-low outputs, it replaces a handful of discrete gates and saves board area when you need to map a 3-bit address space to eight peripheral selects. ## Supply rail and output drive — where the numbers hit the board If your board runs a 3.3 V core and a 5 V I/O rail, the SN74S138AD lives on the 5 V side. Output high current is 400 µA sourced, low current is 8 mA sunk — the asymmetry means the part drives CMOS inputs cleanly but struggles to sink heavy LED loads or relay coils without a buffer. ## Temperature grade and package — where this part fits in the enclosure It does not belong in an unheated outdoor cabinet or under-hood automotive slot; for those you would step to the SN74S138ANSR (industrial-grade sibling) if the rest of the BOM can tolerate the wider temp swing. ## Lifecycle and compliance — what the procurement record says The part carries the standard TI 74S series datasheet with full DC and AC characteristics; the Schottky clamp diodes in the output structure limit undershoot below ground, a detail worth noting if the bus sees long backplane traces with transmission-line reflections.","metaTitle":"SN74S138AD 74S Decoder/Demux, 1x3:8, 16-SOIC","metaDescription":"Active TI SN74S138AD decoder/demultiplexer, 1 x 3:8 circuit, 4.75-5.25V supply, 0-70°C, 16-SOIC. Available to order, pricing confirmed at RFQ.","metaKeywords":null},"attributes":{"series":"74S","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Type":"Decoder/Demultiplexer","Series":"74S","Circuit":"1 x 3:8","Package":"Tube","Mounting Type":"Surface Mount","Package / Case":"16-SOIC (0.154\\\", 3.90mm Width)","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-SOIC","Current - Output High, Low":"400µA, 8mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.21","priceTiers":[{"qty":1,"price":"$2.21000","currency":"USD"},{"qty":10,"price":"$1.98600","currency":"USD"},{"qty":25,"price":"$1.87360","currency":"USD"},{"qty":100,"price":"$1.59630","currency":"USD"},{"qty":250,"price":"$1.49884","currency":"USD"},{"qty":500,"price":"$1.31148","currency":"USD"},{"qty":1000,"price":"$1.08666","currency":"USD"},{"qty":2500,"price":"$1.06050","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a2a6db0ff07322d193a670f2cfc006b5.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74S138AD/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to SN74S138AD?","answer":"Within the same 74S family, the SN74S138AN (PDIP-16) is functionally identical but through-hole; the SN74S138ADW (SOIC-16 wide-body) shares the same logic but differs in package width. For a drop-in SOIC-16 replacement, the SN74LS138AD (74LS series) is pin-compatible but uses low-power Schottky instead of standard Schottky — verify propagation delay if your timing budget is tight."},{"question":"What compliance documentation does Texas Instruments provide for SN74S138AD?","answer":"Texas Instruments certifies the SN74S138AD as ROHS3 Compliant. Standard documentation includes the datasheet, application notes for the 74S series, and material declaration reports available through TI's compliance portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74S138AD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74S138AD 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}}