{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74HCS574RKSR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74HCS574RKSR","canonicalUrl":"https://icboms.com/texas-instruments/SN74HCS574RKSR","factsUrl":"https://icboms.com/api/mcp/products/SN74HCS574RKSR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HCS series D-Type flip-flop, SN74HCS574RKSR, 8-bit, positive edge trigger, tri-state outputs, 135 MHz clock, 20-VFQFN exposed pad package.","salesMarkdown":"## Active 8-bit D-type with wide supply range The SN74HCS574RKSR: It operates across a 2V to 6V supply range, covering both 3.3V and 5V logic rails in mixed-voltage designs. Positive edge triggering and tri-state outputs make it suitable for synchronous bus-oriented storage and register applications. ## Timing and drive for bus integration Clock frequency reaches 135 MHz, setting the data throughput ceiling for the register bank. Maximum propagation delay is 11 ns at 6V supply with a 50 pF load — the timing budget for the critical path must account for this delay plus output rise time into the bus capacitance. Each output drives 7.8 mA source and sink at the rated supply voltage, sufficient for typical TTL/CMOS fan-out of 10-15 loads on a short PCB trace. Input capacitance is 5 pF, presenting a light load to the upstream driving stage and preserving signal integrity on high-speed clock and data lines. ## Industrial temperature and low standby power Rated for -40°C to 125°C ambient operating temperature, this flip-flop suits industrial enclosures, outdoor telecom cabinets, and under-hood automotive modules where the junction temperature sees the full range. Quiescent current is 2 µA typical, keeping the standby draw negligible in battery-backed or always-on systems where the register holds state during sleep. ## 20-VQFN package and reflow handling Housed in a 20-VFQFN exposed pad package (supplier device package 20-VQFN 2.5x4.5 mm), the part requires a thermal pad on the PCB for heat sinking — the exposed paddle must be soldered to a copper plane to keep junction temperature within limits under continuous switching. Available in Tape & Reel or Cut Tape formats, the reel suits automated pick-and-place for volume production; Cut Tape works for prototype or low-volume builds. ## Sourcing and lifecycle for BOM planning Texas Instruments lists the SN74HCS574RKSR as Active — no last-time-buy window or EOL notice is published, so the part is safe to specify for new designs and long-run production.","metaTitle":"SN74HCS574RKSR D-Type Flip-Flop, 135 MHz, 20-VQFN","metaDescription":"Texas Instruments SN74HCS574RKSR 8-bit D-type flip-flop with tri-state outputs. 135 MHz clock, 2-6V supply, -40 to 125°C. Active production, sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"Not applicable","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"D-Type","Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Standard","Output Type":"Tri-State","Trigger Type":"Positive Edge","Mounting Type":"Surface Mount","Package / Case":"20-VFQFN Exposed Pad","Clock Frequency":"135 MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"2V ~ 6V","Input Capacitance":"5 pF","Number of Elements":"1","Operating Temperature":"-40°C ~ 125°C (TA)","Supplier Device Package":"20-VQFN (2.5x4.5)","Current - Quiescent (Iq)":"2 µA","Current - Output High, Low":"7.8mA, 7.8mA","Number of Bits per Element":"8","Max Propagation Delay @ V, Max CL":"11ns @ 6V, 50pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.69","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.69000","currency":"USD"},{"qty":10,"price":"$0.61000","currency":"USD"},{"qty":25,"price":"$0.57280","currency":"USD"},{"qty":100,"price":"$0.46760","currency":"USD"},{"qty":250,"price":"$0.43436","currency":"USD"},{"qty":500,"price":"$0.36966","currency":"USD"},{"qty":1000,"price":"$0.29573","currency":"USD"},{"qty":3000,"price":"$0.22543","currency":"USD"},{"qty":6000,"price":"$0.21089","currency":"USD"},{"qty":15000,"price":"$0.19634","currency":"USD"},{"qty":30000,"price":"$0.18616","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/c0d2bc3d5dbf4523694a41a3814dc1a3.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source to SN74HCS574RKSR?","answer":"The SN74LVC574APWT is a peer 8-bit D-type flip-flop with tri-state outputs and positive edge trigger, but it operates from a 1.65V supply (vs 2-6V for the HCS) and offers 24 mA output drive at 3.3V. The pinout and package differ — the LVC variant comes in TSSOP, not VQFN — so a board layout change is needed for substitution."},{"question":"What compliance documentation does Texas Instruments provide for SN74HCS574RKSR?","answer":"Texas Instruments provides RoHS and REACH compliance declarations for the SN74HCS574RKSR as standard for active logic products. No UL or IEC certification is listed for this device class."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74HCS574RKSR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74HCS574RKSR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}