{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CD74ACT540E","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CD74ACT540E","canonicalUrl":"https://icboms.com/texas-instruments/CD74ACT540E","factsUrl":"https://icboms.com/api/mcp/products/CD74ACT540E","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74ACT series, CD74ACT540E, Buffer, Inverting, 3-State, 8-bit, 24 mA output, 4.5V–5.5V supply, -55°C to 125°C, 20-DIP through-hole.","salesMarkdown":"The CD74ACT540E is an 8-bit inverting buffer with 3-state outputs from the 74ACT family. It takes eight input signals, inverts them, and drives the results onto a shared bus — the 3-state outputs let you disconnect the buffer from the bus when the output-enable pin is deasserted, which is the standard way to build a bidirectional data path without contention. The 74ACT series uses an advanced CMOS process that combines the speed of bipolar 74F logic with the low power of CMOS, so this part switches fast enough for most 5 V microprocessor and DSP interfaces while drawing far less quiescent current than a bipolar buffer. If your board runs a 3.3 V core with a 5 V I/O plane, this buffer sits on the 5 V side. For a ground-based industrial controller that stays indoors, the extra temperature headroom is free margin. ## Output drive and 3-state control The 3-state control is active-low on the CD74ACT540E — when the output-enable pin is low, the outputs follow the inverted inputs; when high, the outputs go high-impedance. This lets multiple buffers share a bus without fighting each other. ## Package and mounting — through-hole DIP That makes it easy to breadboard, hand-wire, or socket in a legacy PCB. The supplier device package is 20-PDIP. If your assembly line is entirely SMT, you will want the surface-mount variant (CD74ACT540M or similar) — but for prototyping, repair, or low-volume builds where hand-soldering is the norm, the DIP is the practical choice.","metaTitle":"CD74ACT540E Buffer, Inverting, 3-State, 20-DIP, 74ACT","metaDescription":"CD74ACT540E 8-bit inverting buffer with 3-state outputs, 24 mA drive, 4.5V–5.5V supply, -55°C to 125°C. Active production, through-hole 20-DIP.","metaKeywords":null},"attributes":{"series":"74ACT","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"74ACT","Package":"Tube","Logic Type":"Buffer, Inverting","Output Type":"3-State","Mounting Type":"Through Hole","Package / Case":"20-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Number of Elements":"1","Operating Temperature":"-55°C ~ 125°C (TA)","Supplier Device Package":"20-PDIP","Current - Output High, Low":"24mA, 24mA","Number of Bits per Element":"8"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.31","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.31000","currency":"USD"},{"qty":10,"price":"$1.16900","currency":"USD"},{"qty":25,"price":"$1.11000","currency":"USD"},{"qty":100,"price":"$0.91180","currency":"USD"},{"qty":250,"price":"$0.85236","currency":"USD"},{"qty":500,"price":"$0.75324","currency":"USD"},{"qty":1000,"price":"$0.59466","currency":"USD"},{"qty":2500,"price":"$0.56100","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/21b567ffe9e3697e3eb64ad072bdf83d.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the function of CD74ACT540E?","answer":"The CD74ACT540E is an 8-bit inverting buffer with 3-state outputs. It takes eight input signals, inverts them, and drives them onto a bus when the output-enable pin is low. When the output-enable pin is high, the outputs go high-impedance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CD74ACT540E","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CD74ACT540E 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}}