{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CD74HCT138M","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CD74HCT138M","canonicalUrl":"https://icboms.com/texas-instruments/CD74HCT138M","factsUrl":"https://icboms.com/api/mcp/products/CD74HCT138M","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HCT series CD74HCT138M, 1 x 3:8 Decoder/Demultiplexer, 4.5V ~ 5.5V supply, 4mA output, -55°C ~ 125°C, 16-SOIC surface mount, active lifecycle.","salesMarkdown":"## 1-of-8 decoder/demultiplexer for address decoding and data routing The CD74HCT138M is a single 3-to-8 line decoder/demultiplexer from the 74HCT logic family. It takes a 3-bit binary input and selects one of eight active-low outputs. The HCT input thresholds are TTL-compatible, so it can be driven by 5 V logic outputs without level translation. ## Output drive and supply considerations That is enough to drive a single LSTTL load or a CMOS gate input directly, but for heavier fan-out — multiple loads or longer traces — a buffer stage is advisable. The 4 mA figure is the same for both high and low states, so the drive is symmetrical. The 4.5 V minimum supply means this part will not run reliably at 3.3 V. If your design uses a 3.3 V rail, look at the 74LV or 74LVC series for a 3.3 V–compatible decoder. At 5 V ±10 % it is solid. ## Package and board-level fit Shipping medium is tube. If your pick-and-place line expects tape-and-reel, verify the reel option (often the same die in a different order code suffix). The 16-SOIC package is MSL 1 typically, but confirm the bake requirements if the tube seal is broken. ## Lifecycle and sourcing posture ROHS3 compliant. No LTB risk on this code today.","metaTitle":"CD74HCT138M 74HCT Decoder/Demultiplexer, 1x3:8, 16-SOIC","metaDescription":"CD74HCT138M 74HCT 1-of-8 decoder/demultiplexer. 4.5V–5.5V supply, -55°C to 125°C, 4mA output drive. Active lifecycle, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"74HCT","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Decoder/Demultiplexer","Series":"74HCT","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":"4.5V ~ 5.5V","Independent Circuits":"1","Operating Temperature":"-55°C ~ 125°C","Voltage Supply Source":"Single Supply","Supplier Device Package":"16-SOIC","Current - Output High, Low":"4mA, 4mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.34","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.34000","currency":"USD"},{"qty":10,"price":"$1.19500","currency":"USD"},{"qty":25,"price":"$1.13360","currency":"USD"},{"qty":100,"price":"$0.93130","currency":"USD"},{"qty":250,"price":"$0.87056","currency":"USD"},{"qty":500,"price":"$0.76934","currency":"USD"},{"qty":1000,"price":"$0.60738","currency":"USD"},{"qty":2500,"price":"$0.57300","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2fc5201369129d29f1b31cc529b87c5a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How does CD74HCT138M differ from the 74HC138?","answer":"The key difference is input logic thresholds. The 74HCT138 uses TTL-compatible input levels (V_IL max 0.8 V, V_IH min 2.0 V at 5 V), while the 74HC138 uses CMOS thresholds (V_IL max 1.5 V, V_IH min 3.5 V at 5 V). If your driving logic is 5 V TTL or mixed 3.3 V/5 V, the HCT variant provides better noise margin. Both share the same pinout, package options, and output drive characteristics."},{"question":"Is CD74HCT138M 5V tolerant?","answer":"Yes. The inputs are TTL-compatible and can accept 5 V logic levels directly. There is no 5 V tolerance rating beyond the supply range — do not exceed 5.5 V on any pin."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CD74HCT138M","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CD74HCT138M when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T10:39:33.080Z","lastPublished":"2026-07-16T10:39:33.080Z","indexable":true}}