{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74ALS240ADWR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74ALS240ADWR","canonicalUrl":"https://icboms.com/texas-instruments/SN74ALS240ADWR","factsUrl":"https://icboms.com/api/mcp/products/SN74ALS240ADWR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74ALS series, SN74ALS240ADWR, Buffer, Inverting, 3-State, 2 elements, 4 bits per element, 15mA/24mA output, 4.5V~5.5V supply, 0°C~70°C, 20-SOIC.","salesMarkdown":"## Inverting buffer with 3-state outputs for 5V bus isolation The SN74ALS240ADWR from Texas Instruments is a dual 4-bit inverting buffer with 3-state outputs, part of the 74ALS logic family. It provides eight inverting channels arranged as two independent elements of four bits each, with a common output-enable control per element. The 3-state outputs allow the device to be placed in a high-impedance state for bus-oriented applications, effectively disconnecting the outputs from the bus when not selected. Operating from a 4.5V to 5.5V supply, this part is designed for 5V TTL or CMOS logic systems. It can source 15mA and sink 24mA per output, providing enough drive for standard logic inputs, LED indicators, or short PCB traces. The commercial temperature range of 0°C to 70°C suits it for office equipment, appliances, and other indoor electronics where ambient temperature stays controlled. ## 15mA source / 24mA sink — what the drive ratings mean for your bus The 15mA output-high and 24mA output-low currents are typical for the ALS family and reflect a balanced drive capable of handling standard TTL fan-outs. For a typical LSTTL input requiring 20µA high and 0.4mA low, a single output can drive hundreds of loads. However, when driving capacitive loads like long PCB traces or ribbon cables, the AC switching current becomes the limiter, not the DC rating. The 3-state outputs also allow multiple buffers to share a common bus line without contention, as long as only one device is active at a time. ## Active lifecycle — no end-of-life concern for current designs It is ROHS3 compliant, so it meets current European and global environmental requirements for lead-free assembly. ## 20-SOIC wide-body footprint — layout considerations The device comes in a 20-SOIC wide-body package (0.295\" body width, 7.50mm), which is a common footprint for octal buffers and transceivers. The wide body provides better thermal dissipation than the narrow SOIC variant, though at the drive currents this part handles, thermal concerns are minimal. The surface-mount package is suitable for automated assembly, and the Tape & Reel option (TR) is the standard for volume production. Cut Tape (CT) is available for prototyping or low-volume builds.","metaTitle":"SN74ALS240ADWR Buffer, Inverting 3-State 20-SOIC, 4.5V-5.5V","metaDescription":"Texas Instruments SN74ALS240ADWR is an inverting buffer with 3-state outputs in a 20-SOIC package. Operates from 4.5V to 5.5V, sources 15mA and sinks 24mA.","metaKeywords":null},"attributes":{"series":"74ALS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Series":"74ALS","Package":"Tape & Reel (TR); Cut Tape (CT)","Logic Type":"Buffer, Inverting","Output Type":"3-State","Mounting Type":"Surface Mount","Package / Case":"20-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Number of Elements":"2","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"20-SOIC","Current - Output High, Low":"15mA, 24mA","Number of Bits per Element":"4"}},"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":2000,"price":"$0.57600","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a1951ee73deea91a348f41731d405ef4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the alternatives or equivalents for SN74ALS240ADWR?","answer":"The SN74ALS240ADWR is an inverting buffer with 3-state outputs. A non-inverting alternative with similar drive is the SN74ALS244ADW (same package and supply range, but non-inverting). For higher speed or lower voltage, the SN74ABT2245DW (4.5V supply, -40°C to 85°C) or SN74LVTH16245ADGVR (2.7V to 3.6V, 32mA drive) are functional alternatives but differ in logic type (transceiver vs buffer) and voltage compatibility."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74ALS240ADWR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74ALS240ADWR 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}}