{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX491ECSD+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX491ECSD","canonicalUrl":"https://icboms.com/analog-devices/MAX491ECSD","factsUrl":"https://icboms.com/api/mcp/products/MAX491ECSD%2B","rawCanonicalId":null},"summary":{"shortDescription":"Maxim Integrated MAX491ECSD+, RS-422/RS-485 Transceiver, Full Duplex, 1/1 Drivers/Receivers, 2.5 Mbps, 4.75V–5.25V Supply, 0°C to 70°C, 14-SOIC.","salesMarkdown":"## Part identity and function The Maxim Integrated MAX491ECSD+ is a full-duplex transceiver in a 14-SOIC surface-mount package. It integrates one driver and one receiver, operates from a 4.75 V to 5.25 V supply, and is rated for 0°C to 70°C. The 70 mV receiver hysteresis improves noise margin, and the 2.5 Mbps data rate supports most industrial serial links. ## 2.5 Mbps and full duplex — what they mean for the bus Full duplex means the MAX491 can transmit and receive simultaneously over a four-wire RS-422 bus (or a two-pair RS-485 network with separate enable control). The 2.5 Mbps data rate is typical for building-automation gateways, PLC-to-drive links, and multi-drop sensor networks where the cable run stays under about 400 m. At this speed the driver slew rate is fast enough that stub lengths on the bus should be kept under 30 cm to avoid reflections. ## Lifecycle and supply posture The MAX491ECSD+ carries an Active product status and is ROHS3 compliant.","metaTitle":"MAX491ECSD+ RS-485/RS-422 Transceiver, Full Duplex, 2.5 Mbps","metaDescription":"MAX491ECSD+ is a 5V full-duplex RS-485/RS-422 transceiver in 14-SOIC, 2.5 Mbps data rate, 70 mV hysteresis, 0°C to 70°C. Active, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Transceiver","Duplex":"Full","Package":"Tube","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":"0°C ~ 70°C","Supplier Device Package":"14-SOIC","Number of Drivers/Receivers":"1/1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.67","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.67000","currency":"USD"},{"qty":10,"price":"$5.09600","currency":"USD"},{"qty":25,"price":"$4.81760","currency":"USD"},{"qty":100,"price":"$4.17530","currency":"USD"},{"qty":250,"price":"$3.96120","currency":"USD"},{"qty":500,"price":"$3.55440","currency":"USD"},{"qty":1000,"price":"$2.99768","currency":"USD"},{"qty":2500,"price":"$2.84780","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/44b4a4b2553f52a56d8665981e25a7bf.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the data rate of MAX491ECSD+?","answer":"The MAX491ECSD+ supports a data rate of 2.5 Mbps. This is the maximum rate under the specified supply and load conditions."},{"question":"Does MAX491ECSD+ support full duplex?","answer":"Yes, the MAX491ECSD+ is a full-duplex transceiver. It can transmit and receive simultaneously, which is typical for RS-422 point-to-point links or four-wire RS-485 networks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX491ECSD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX491ECSD 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}}