{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74LS08D","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74LS08D","canonicalUrl":"https://icboms.com/texas-instruments/SN74LS08D","factsUrl":"https://icboms.com/api/mcp/products/SN74LS08D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SN74LS08D, 74LS series, AND Gate, 4 Circuits, 2 Inputs, 400µA, 8mA, 14-SOIC, 0°C to 70°C.","salesMarkdown":"## Quad 2-input AND gate in 14-SOIC — 74LS logic for 5 V boards The Texas Instruments SN74LS08D is a quad 2-input AND gate from the 74LS Schottky-clamped TTL family, packaged in a 14-SOIC (3.90 mm width) for surface-mount assembly. It integrates four independent AND gates, each with two inputs, and operates from a 4.75 V to 5.25 V supply. The 74LS series balances speed and power — propagation delay is 20 ns at 5 V with a 15 pF load — making it a fit for legacy 5 V bus interfaces, control logic, and glue logic in commercial-temperature equipment (0°C to 70°C). ## 20 ns propagation delay — timing margin in a 5 V system The 20 ns max propagation delay at 5 V and 15 pF load sets the timing budget for cascaded gates in address decoding, clock gating, or enable chains. In a 10 MHz bus with a 100 ns cycle, two LS08 gates in series eat 40 ns of margin — enough to matter if the path also includes a decoder or latch. The Schottky clamp reduces storage time versus standard TTL, so the delay is consistent across temperature and supply within the rated range. ## Output drive and fan-out Each gate sources 400 µA and sinks 8 mA at the output. That 8 mA sink can drive up to ten 74LS loads (each 0.4 mA input low current) directly, or a single standard TTL load. For driving a higher-current load like an LED or a relay coil, buffer the output with a transistor or a line driver — the 8 mA ceiling is firm. ## Supply range and noise immunity The 4.75 V to 5.25 V supply covers a nominal 5 V rail with ±5% regulation. Input low threshold is 0.8 V max, high threshold 2 V min, giving about 0.4 V of low-side noise margin and 0.7 V on the high side at 5 V. That is adequate for a clean backplane but marginal in a noisy industrial environment — the 74LS family was designed for controlled commercial settings, not factory-floor transients. ## Temperature grade — commercial only Rated 0°C to 70°C, this is a commercial-temperature device. It belongs in office equipment, appliances, test gear, and indoor telecom — not in an engine bay, outdoor enclosure, or cold warehouse. If the board sees -20°C or 85°C ambient, step to the 74LS08D's industrial sibling (SN74LS08D with a different suffix) or move to 74HC08D which offers wider temperature range. ## Lifecycle and sourcing The SN74LS08D carries an active lifecycle status and is ROHS3 compliant. For new designs, the 74LS family remains a valid choice for 5 V-only legacy systems where lower-power 74HC or 74HCT logic is not pin-compatible or where the Schottky speed is needed. Availability is confirmed through independent distribution; current pricing and lead time are quoted against an RFQ.","metaTitle":"SN74LS08D Quad 2-Input AND Gate, 74LS, 20 ns, 14-SOIC","metaDescription":"SN74LS08D quad 2-input AND gate from the 74LS family. 20 ns propagation delay at 5 V, 15 pF. 4.75 V to 5.25 V supply, 0°C to 70°C.","metaKeywords":null},"attributes":{"series":"74LS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Series":"74LS","Package":"Tube","Logic Type":"AND Gate","Mounting Type":"Surface Mount","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Number of Inputs":"2","Voltage - Supply":"4.75V ~ 5.25V","Number of Circuits":"4","Operating Temperature":"0°C ~ 70°C","Input Logic Level - Low":"0.8V","Supplier Device Package":"14-SOIC","Input Logic Level - High":"2V","Current - Output High, Low":"400µA, 8mA","Max Propagation Delay @ V, Max CL":"20ns @ 5V, 15pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.34","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.34000","currency":"USD"},{"qty":10,"price":"$1.20100","currency":"USD"},{"qty":25,"price":"$1.13960","currency":"USD"},{"qty":100,"price":"$0.93620","currency":"USD"},{"qty":250,"price":"$0.87512","currency":"USD"},{"qty":500,"price":"$0.77338","currency":"USD"},{"qty":1000,"price":"$0.61056","currency":"USD"},{"qty":2500,"price":"$0.57600","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6d635c0c263ba33b3fcc25aa4895c294.pdf","sourceUrl":null},"ai":{"faq":[{"question":"SN74LS08D vs 74HC08D: which is better?","answer":"The 74HC08D runs from 2 V to 6 V, draws lower quiescent current, and offers a wider temperature range (-40°C to 85°C) with similar propagation delay (around 15 ns at 5 V). The SN74LS08D is a 5 V-only part with higher power consumption but is directly compatible with legacy TTL input thresholds — if the rest of the board is 74LS or 74ALS, the LS08D avoids level-shifting. For a new 5 V design, 74HC08D is generally the lower-power, wider-range choice; for a retrofit into an existing 74LS bus, the SN74LS08D is the drop-in."},{"question":"What is the propagation delay of SN74LS08D?","answer":"20 ns maximum at 5 V supply with a 15 pF load. This is the typical timing spec for a single gate in the 74LS family."},{"question":"What is the closest pin-compatible alternative to SN74LS08D?","answer":"The 74HC08D (quad 2-input AND gate in 14-SOIC) is pin-compatible and offers a wider supply range and lower power, but uses CMOS input thresholds. The SN74LS08N is the same logic in a 14-DIP through-hole package — not pin-compatible on the same footprint but electrically identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74LS08D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74LS08D 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}}