{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CD74HCT109M","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"CD74HCT109M","canonicalUrl":"https://icboms.com/texas-instruments/CD74HCT109M","factsUrl":"https://icboms.com/api/mcp/products/CD74HCT109M","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HCT series JK flip-flop, dual element, 1-bit per element, positive-edge triggered, complementary outputs, set/preset and reset, 54 MHz clock, 4.5V to 5.5V supply, -55°C to 125°C, 16-SOIC surface mount.","salesMarkdown":"## Dual JK flip-flop with set and reset — the field-replaceable workhorse The Texas Instruments CD74HCT109M is a dual positive-edge-triggered JK flip-flop in a 16-SOIC package, with independent set (preset) and reset inputs per element and complementary outputs. Clock frequency hits 54 MHz, with a propagation delay of 40 ns at 4.5V into a 50 pF load. Quiescent supply current is a lean 4 µA, and each output can source or sink 4 mA — enough to drive standard CMOS logic inputs or a single low-current LED indicator on a panel. The operating temperature range is -55°C to 125°C. ## What the ratings mean for the BOM Output drive is 4 mA per pin. Input capacitance is 10 pF per the datasheet — factor that into your clock-line loading if you are daisy-chaining multiple flip-flops on a single clock trace. At 54 MHz, a few extra pF of trace + input capacitance can start to round the clock edges. ## Temperature grade and deployment environment Rated for -55°C to 125°C ambient operation, this part belongs in equipment that sees thermal cycling from cold-soak to under-hood heat: avionics LRUs, missile guidance electronics, satellite telemetry boards, downhole drilling instrumentation, and outdoor base-station RF control logic. The 16-SOIC package is surface-mount, so it can be conformal-coated for humidity and vibration resistance. No lab bench needed to swap it — a standard soldering iron and a steady hand are enough for field replacement, though a hot-air station makes desoldering cleaner.","metaTitle":"CD74HCT109M JK Flip-Flop, 54 MHz, -55 to 125°C, 16-SOIC","metaDescription":"TI CD74HCT109M dual JK flip-flop with set/reset, 54 MHz clock, 4.5-5.5V supply, -55 to 125°C temp range. Active, ROHS3.","metaKeywords":null},"attributes":{"series":"74HCT","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"JK Type","Series":"74HCT","Package":"Tube","Function":"Set(Preset) and Reset","Output Type":"Complementary","Trigger Type":"Positive Edge","Mounting Type":"Surface Mount","Package / Case":"16-SOIC (0.154\\\", 3.90mm Width)","Clock Frequency":"54 MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Input Capacitance":"10 pF","Number of Elements":"2","Operating Temperature":"-55°C ~ 125°C (TA)","Supplier Device Package":"16-SOIC","Current - Quiescent (Iq)":"4 µA","Current - Output High, Low":"4mA, 4mA","Number of Bits per Element":"1","Max Propagation Delay @ V, Max CL":"40ns @ 4.5V, 50pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.13","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.13000","currency":"USD"},{"qty":10,"price":"$1.00700","currency":"USD"},{"qty":25,"price":"$0.95560","currency":"USD"},{"qty":100,"price":"$0.78500","currency":"USD"},{"qty":250,"price":"$0.73384","currency":"USD"},{"qty":500,"price":"$0.64850","currency":"USD"},{"qty":1000,"price":"$0.51198","currency":"USD"},{"qty":2500,"price":"$0.48300","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/069eef60f1b3b9fb7076ba204f881907.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is CD74HCT109M obsolete or still active?","answer":"Active. The manufacturer lists it as current production, ROHS3 compliant, with no end-of-life notice. It is safe to design into new BOMs."},{"question":"Does CD74HCT109M work with 3.3V logic?","answer":"No. The supply range is 4.5V to 5.5V, and HCT inputs are TTL-threshold. A 3.3V CMOS output driving HIGH may not reach the ~2.0V V_IH(min) reliably. Use a level translator or run the flip-flop at 5V with 3.3V-tolerant inputs through a buffer."},{"question":"What is the difference between CD74HCT109M and CD74HC109M?","answer":"The HCT version (this part) has TTL-compatible input thresholds, so it can be driven directly by 74LS or 74S outputs. The HC version uses CMOS thresholds and may not recognize a TTL-level HIGH as a valid logic 1. Both run on 2V to 6V supply, but HCT is the better choice for mixed-technology 5V boards that include legacy bipolar logic."},{"question":"What are equivalent replacements for CD74HCT109M?","answer":"No direct pin-compatible second source is listed in the manufacturer's cross-reference. The SN74LS175NS is a different function (quad D-type, not dual JK) and the DM7474N is a D-type, not a JK. For a true JK flip-flop in 16-SOIC with set/reset, the TI CD74HCT109M is the standard part. The 74HCT109 from other vendors (NXP, ON Semiconductor) may be functionally equivalent, but verify pinout and timing before substituting."},{"question":"Is CD74HCT109M compatible with 5V logic systems?","answer":"Yes. It is designed for 4.5V to 5.5V supply and its inputs are TTL-compatible, so it works directly with 5V CMOS, 74LS, 74S, and 74HCT logic families. Outputs swing rail-to-rail, so they drive 5V CMOS inputs cleanly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/CD74HCT109M","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/CD74HCT109M when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-13T20:06:13.731Z","lastPublished":"2026-07-13T20:06:13.731Z","indexable":true}}