{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DS4550E+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"DS4550E","canonicalUrl":"https://icboms.com/analog-devices/DS4550E","factsUrl":"https://icboms.com/api/mcp/products/DS4550E%2B","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices DS4550E+ I²C / JTAG I/O Expander, 9 I/O, 400 kHz clock, Open Drain outputs, 2.7V–5.5V supply, -40°C to 85°C, 20-TSSOP package, Tube.","salesMarkdown":"## I²C bus at 400 kHz — what it sets for the bus budget The 400 kHz clock is standard fast-mode I²C. That limits the total bus capacitance (including trace, cable, and device input capacitance) to about 400 pF for reliable edge rates. If you are running this expander on a long backplane or through a ribbon cable, you will need a bus buffer or repeater. The JTAG interface shares the same pins as the I²C lines, selected via the configuration EEPROM — so you get boundary-scan test access without extra package pins. ## Temperature grade and environment Rated for -40°C to 85°C, the DS4550E+ fits industrial environments: factory-floor PLC cabinets, outdoor telecom enclosures, and engine-bay electronics that see temperature swings. The 20-TSSOP package (4.40 mm body width) is compact enough for dense PCB layouts but still hand-solderable with a fine tip.","metaTitle":"DS4550E+ I²C / JTAG I/O Expander, 9 I/O, 400 kHz, 20-TSSOP","metaDescription":"DS4550E+ I²C/JTAG I/O expander with 9 open-drain I/O, 400 kHz clock, 2.7V–5.5V supply, industrial temp -40°C to 85°C. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tube","Features":"EEPROM, POR","Interface":"I²C, JTAG","Output Type":"Open Drain","Mounting Type":"Surface Mount","Number of I/O":"9","Package / Case":"20-TSSOP (0.173\\\", 4.40mm Width)","Clock Frequency":"400 kHz","lifecycle_stage":"eol_hot","Interrupt Output":"No","Voltage - Supply":"2.7V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"20-TSSOP","Current - Output Source/Sink":"16mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.0","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.00000","currency":"USD"},{"qty":10,"price":"$5.38500","currency":"USD"},{"qty":25,"price":"$5.09040","currency":"USD"},{"qty":100,"price":"$4.41170","currency":"USD"},{"qty":250,"price":"$4.18544","currency":"USD"},{"qty":500,"price":"$3.75558","currency":"USD"},{"qty":1000,"price":"$3.16736","currency":"USD"},{"qty":2500,"price":"$3.00899","currency":"USD"}]},"links":{"datasheetUrl":"https://datasheets.maximintegrated.com/en/ds/DS4550.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between DS4550 and DS4550E+?","answer":"The DS4550E+ is the lead-free (ROHS3-compliant) version of the DS4550. Functionally they are identical — same 9 I/O, I²C/JTAG interface, supply range, and temperature grade. The E+ suffix indicates the ROHS-compliant finish."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/DS4550E","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/DS4550E 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}}