{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74LS73AN","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74LS73AN","canonicalUrl":"https://icboms.com/texas-instruments/SN74LS73AN","factsUrl":"https://icboms.com/api/mcp/products/SN74LS73AN","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74LS series, SN74LS73AN, dual 1-bit JK flip-flop with master reset, negative-edge trigger, complementary outputs, 45 MHz clock, 4.75V–5.25V supply, 14-DIP (0.300\"), 0°C to 70°C.","salesMarkdown":"## Dual JK flip-flop for 5V logic chains The Texas Instruments SN74LS73AN is a dual 1-bit JK flip-flop in the 74LS low-power Schottky family. Each flip-flop has a master-reset input for clearing the output asynchronously, and the trigger is negative-edge on the clock pin — meaning the output state toggles on the falling edge, not the rising one. The complementary outputs (Q and Q-bar) are available for both channels. This part is a direct fit for legacy 5V TTL logic designs where you need a simple toggle or divide-by-two function with a clean reset. ## 45 MHz clock and 20 ns propagation delay The 45 MHz maximum clock frequency is the speed ceiling for cascaded stages — each flip-flop adds 20 ns of propagation delay at 5V with a 45 pF load. In a multi-stage counter or shift register, the total delay accumulates and limits the maximum chain length before timing violations appear. The 400 µA output-high and 8 mA output-low drive are standard for the 74LS family; they can sink enough current to drive one or two standard TTL loads but not a heavy bus or LED directly. ## Supply and temperature — what fits The supply range is 4.75 V to 5.25 V — a tight 5V ±5% rail. It belongs on a clean 5V logic rail, typically from a linear regulator or a 5V switching supply with low ripple. ## Lifecycle and sourcing No end-of-life notice or last-time-buy risk. It is a current, standard-logic part that remains widely specified for repair, legacy-equipment support, and new through-hole designs that need a reliable JK flip-flop.","metaTitle":"SN74LS73AN JK Flip-Flop, 74LS, Dual 1-Bit, 45 MHz, 14-DIP","metaDescription":"SN74LS73AN JK flip-flop with master reset, negative-edge trigger, 45 MHz clock, 5V supply, 14-DIP. Active, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"74LS","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"JK Type","Series":"74LS","Package":"Tube","Function":"Master Reset","Output Type":"Complementary","Trigger Type":"Negative Edge","Mounting Type":"Through Hole","Package / Case":"14-DIP (0.300\\\", 7.62mm)","Clock Frequency":"45 MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"4.75V ~ 5.25V","Number of Elements":"2","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"14-PDIP","Current - Quiescent (Iq)":"6 mA","Current - Output High, Low":"400µA, 8mA","Number of Bits per Element":"1","Max Propagation Delay @ V, Max CL":"20ns @ 5V, 45pF"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.35","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.35000","currency":"USD"},{"qty":10,"price":"$2.10700","currency":"USD"},{"qty":25,"price":"$1.98760","currency":"USD"},{"qty":100,"price":"$1.69340","currency":"USD"},{"qty":250,"price":"$1.59000","currency":"USD"},{"qty":500,"price":"$1.39124","currency":"USD"},{"qty":1000,"price":"$1.15275","currency":"USD"},{"qty":2500,"price":"$1.12500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/acb88f37abd70372fc5168ec938eb7d0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SN74LS73AN RoHS compliant?","answer":"Yes, it is rated ROHS3 compliant."},{"question":"What is the difference between SN74LS73AN and SN74LS73A?","answer":"The SN74LS73A is the same functional JK flip-flop but in a different package variant (often surface-mount or narrower DIP). The SN74LS73AN specifically is the through-hole 14-DIP version. Electrical specs are identical."},{"question":"What is the function of SN74LS73AN?","answer":"It is a dual 1-bit JK flip-flop with master reset and negative-edge trigger. Each flip-flop toggles its complementary outputs on the falling edge of the clock when J and K are both high, and the master reset asynchronously clears the output regardless of the clock state."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74LS73AN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74LS73AN 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}}