{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN74HCT573PW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN74HCT573PW","canonicalUrl":"https://icboms.com/texas-instruments/SN74HCT573PW","factsUrl":"https://icboms.com/api/mcp/products/SN74HCT573PW","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments 74HCT series, SN74HCT573PW, D-Type Transparent Latch, 8:8 circuit, Tri-State output, 4.5V~5.5V supply, 25ns propagation delay, 6mA output drive, -40°C~85°C, 20-TSSOP package.","salesMarkdown":"## What this 8-bit transparent latch does on your bus It captures eight data bits when the latch-enable (LE) input is high and holds them when LE goes low, with tri-state outputs controlled by an output-enable (OE) pin. The 74HCT series is TTL-input compatible, so it can be driven directly by 5V TTL logic without level translation. ## 25 ns propagation delay — timing budget reality The 25 ns propagation delay is the time from the latch-enable edge to valid data at the outputs. In a typical 5V system clocked at 20 MHz, that delay consumes about half a clock cycle, leaving limited margin for additional bus buffering or long PCB traces. If your design runs a faster bus (e.g., 33 MHz or above), the 74HCT573's 25 ns may force you to pipeline or switch to a faster logic family like 74FCT, where the 74FCT573APC offers 8.5 ns propagation delay. For slower interfaces (8–16 MHz microcontrollers, parallel I/O expansion, or address latching for a 68K bus), 25 ns is well within budget. ## 6 mA output drive — what it can and cannot do The SN74HCT573PW can source or sink 6 mA per output. That is sufficient for driving standard TTL loads, CMOS inputs, or a single LED with a series resistor. It will not drive a relay coil, a high-current bus transceiver, or a long backplane trace directly. For higher drive, consider the 74FCT573APC which provides 15 mA output current, or add a buffer stage. The 6 mA limit also means that if multiple outputs are active simultaneously, the total package dissipation stays low — no thermal derating concerns in the TSSOP-20 package at industrial temperatures. For procurement, this removes the urgency of hunting down date-coded stock or placing LTB orders. No need to stockpile — but always confirm current lead time at quote time. ## Package and footprint: 20-TSSOP The 20-TSSOP package (4.40 mm width, 0.173\" body) is a compact surface-mount footprint common on dense PCBs. No thermal pad or exposed paddle — standard JEDEC moisture sensitivity level 1 (typical for TSSOP) means no bake required before reflow if the bag seal is intact. For layout, the 0.65 mm pin pitch needs careful routing under the body; a via-in-pad is not required.","metaTitle":"SN74HCT573PW 74HCT D-Type Transparent Latch, 20-TSSOP, 25ns","metaDescription":"Texas Instruments SN74HCT573PW 8-bit D-type transparent latch with tri-state outputs.","metaKeywords":null},"attributes":{"series":"74HCT","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"74HCT","Circuit":"8:8","Package":"Tube","Logic Type":"D-Type Transparent Latch","Output Type":"Tri-State","Mounting Type":"Surface Mount","Package / Case":"20-TSSOP (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Independent Circuits":"1","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"20-TSSOP","Delay Time - Propagation":"25ns","Current - Output High, Low":"6mA, 6mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.33","priceTiers":[{"qty":1,"price":"$1.33000","currency":"USD"},{"qty":10,"price":"$1.19100","currency":"USD"},{"qty":25,"price":"$1.13080","currency":"USD"},{"qty":100,"price":"$0.92890","currency":"USD"},{"qty":250,"price":"$0.86828","currency":"USD"},{"qty":500,"price":"$0.76734","currency":"USD"},{"qty":1000,"price":"$0.60579","currency":"USD"},{"qty":2500,"price":"$0.57150","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2472b9d988b7c3e648ffda38ffe9f90e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN74HCT573PW/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between SN74HCT573 and 74LS573?","answer":"The 74LS573 is a bipolar Schottky latch with similar function but different electrical characteristics: it operates on 5V, has lower input impedance, and typically draws more supply current than the 74HCT573. The 74HCT573 is CMOS-based, TTL-input compatible, and offers lower power consumption. Propagation delays are comparable (25 ns for the HCT vs. roughly 18–30 ns for LS depending on load). The HCT variant is generally preferred for new designs due to lower power."},{"question":"Can the SN74HCT573PW drive 6 mA output current at 5V?","answer":"Yes. At 5V nominal, it will deliver 6 mA into a standard TTL load. For higher current requirements (e.g., 15 mA), consider the 74FCT573APC or add an external buffer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN74HCT573PW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN74HCT573PW when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}