{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX491ESD+T","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX491ESDT","canonicalUrl":"https://icboms.com/analog-devices/MAX491ESDT","factsUrl":"https://icboms.com/api/mcp/products/MAX491ESD%2BT","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices MAX491ESD+T RS-422/RS-485 transceiver, full duplex, 2.5 Mbps, 4.75-5.25 V supply, 14-SOIC surface mount, -40 to +85°C.","salesMarkdown":"## RS-485 bus survival — what the ratings mean The MAX491ESD+T: 2.5 Mbps data rate is the switching ceiling — on a long stub or unterminated drop, the signal edge slows and the bit-error rate climbs before you hit that number. Keep the bus properly terminated and the stub length under a few inches to hold the full rate. 70 mV of receiver hysteresis filters out noise on a floating or lightly loaded bus — that is enough margin to avoid chatter on a 100-meter run in a factory with VFD hash on the ground plane. ## Industrial temperature and bus fault tolerance Full-duplex means the driver and receiver are active simultaneously — you get a dedicated pair for TX and a pair for RX, which halves the cable count compared to half-duplex on a two-wire bus. The node count on a single segment is limited by the driver's load capability, not the protocol.","metaTitle":"MAX491ESD+T RS-485/RS-422 Transceiver, 2.5Mbps, 14-SOIC","metaDescription":"MAX491ESD+T full-duplex RS-485/RS-422 transceiver, 2.5 Mbps data rate, 4.75-5.25 V supply, -40 to 85°C, 14-SOIC. Active production, RoHS3. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"Transceiver","Duplex":"Full","Package":"Tape & Reel (TR); Cut Tape (CT)","Protocol":"RS422, RS485","Data Rate":"2.5Mbps","Mounting Type":"Surface Mount","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.75V ~ 5.25V","Receiver Hysteresis":"70 mV","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"14-SOIC","Number of Drivers/Receivers":"1/1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.86","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.86000","currency":"USD"},{"qty":10,"price":"$5.26400","currency":"USD"},{"qty":25,"price":"$4.97680","currency":"USD"},{"qty":100,"price":"$4.31320","currency":"USD"},{"qty":250,"price":"$4.09200","currency":"USD"},{"qty":500,"price":"$3.67176","currency":"USD"},{"qty":1000,"price":"$3.09666","currency":"USD"},{"qty":2500,"price":"$2.94183","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/602428fed3abfc9496453e492ef2d17c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the data rate of MAX491ESD+T?","answer":"The MAX491ESD+T supports a maximum data rate of 2.5 Mbps. This is the switching ceiling; actual throughput depends on bus termination, cable length, and stub topology."},{"question":"Is MAX491ESD+T compatible with RS422 and RS485?","answer":"Yes, the MAX491ESD+T is specified for both RS-422 and RS-485 protocols. It operates as a full-duplex transceiver with one driver and one receiver, suitable for point-to-point or multi-drop RS-485 networks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX491ESDT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX491ESDT 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}}