{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74HCT08D","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74HCT08D","canonicalUrl":"https://icboms.com/texas-instruments/SN74HCT08D","factsUrl":"https://icboms.com/api/mcp/products/SN74HCT08D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HCT series, quad 2-input AND gate, 14-SOIC (0.154\", 3.90mm width), 4.5V ~ 5.5V supply, -40°C ~ 85°C, 22ns max propagation delay at 5.5V/50pF.","salesMarkdown":"## Why the 22 ns propagation delay matters for TTL replacement The SN74HCT08D is a quad 2-input AND gate from the 74HCT family, designed to be a pin-for-pin, function-compatible drop-in for 74LS08 TTL gates in 5V systems. Its input logic thresholds (0.8V low, 2V high) match TTL levels, so it directly replaces a 74LS08 without changing the surrounding pull-up resistors or driver stages. The max propagation delay of 22 ns at 5.5V, 50pF is the critical timing spec: it is slower than a typical 74LS08 (around 10-15 ns), so verify the bus timing budget — if your system already runs near the 74LS08's limit, the extra nanoseconds may cause setup/hold violations on the downstream flip-flop or latch. ## Supply voltage and temperature range for industrial 5V rails The SN74HCT08D operates from 4.5V to 5.5V, a tighter window than the 74HC08D (2V to 6V) but deliberately matched to the 5V ±10% rail common in legacy TTL systems. ## Active lifecycle — no imminent EOL risk for BOM planning The 14-SOIC package (0.154\", 3.90mm width) is a standard JEDEC outline, widely second-sourced by multiple manufacturers — if TI supply tightens, a cross to a 74HCT08 in the same SOIC-14 footprint is straightforward. ROHS3 compliant. ## Package and mounting — SOIC-14 layout fit Surface-mount 14-SOIC package with 1.27 mm pitch. No exposed pad; standard reflow profile for lead-free solder per J-STD-020.","metaTitle":"SN74HCT08D TI 74HCT Quad 2-Input AND Gate","metaDescription":"Texas Instruments SN74HCT08D quad 2-input AND gate, 74HCT series, 4.5V-5.5V supply, 22ns propagation delay at 5.5V/50pF, -40°C to 85°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":"74HCT","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Sensors & Transducers"],"specifications":{"Series":"74HCT","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":"4.5V ~ 5.5V","Number of Circuits":"4","Operating Temperature":"-40°C ~ 85°C","Input Logic Level - Low":"0.8V","Supplier Device Package":"14-SOIC","Input Logic Level - High":"2V","Current - Quiescent (Max)":"2 µA","Current - Output High, Low":"4mA, 4mA","Max Propagation Delay @ V, Max CL":"22ns @ 5.5V, 50pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.16","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.16000","currency":"USD"},{"qty":10,"price":"$1.03500","currency":"USD"},{"qty":25,"price":"$0.98240","currency":"USD"},{"qty":100,"price":"$0.80700","currency":"USD"},{"qty":250,"price":"$0.75436","currency":"USD"},{"qty":500,"price":"$0.66664","currency":"USD"},{"qty":1000,"price":"$0.52629","currency":"USD"},{"qty":2500,"price":"$0.49650","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/ea857a29b0126074ae27c215b51a32f0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between SN74HCT08D and SN74HC08D?","answer":"The SN74HCT08D has TTL-compatible input thresholds (0.8V low, 2V high) and a 4.5V-5.5V supply range, while the SN74HC08D uses CMOS thresholds (typically 0.3×Vcc and 0.7×Vcc) and works from 2V to 6V. In a 5V system with TTL-level inputs, the HCT version is the correct drop-in for 74LS08; the HC version may not reliably recognize a TTL low signal. Propagation delays are similar — both around 22 ns at 5V, 50pF."},{"question":"Can SN74HCT08D replace a 74LS08?","answer":"Yes, the SN74HCT08D is designed as a direct TTL-compatible replacement for the 74LS08. Pinout and function are identical. The key trade-off is propagation delay: the HCT part has a max of 22 ns at 5.5V, 50pF, while a typical 74LS08 is faster (~10-15 ns). Verify that your system's timing budget can absorb the extra delay — especially on critical paths like address decoding or clock gating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74HCT08D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74HCT08D 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}}