{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DS8921AMX","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"DS8921AMX","canonicalUrl":"https://icboms.com/texas-instruments/DS8921AMX","factsUrl":"https://icboms.com/api/mcp/products/DS8921AMX","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments DS8921AMX RS-422/RS-485 transceiver, full duplex, 1 driver/1 receiver, 4.5V-5.5V supply, 70 mV hysteresis, 8-SOIC surface mount, 0°C to 70°C.","salesMarkdown":"## 5V RS-422/485 transceiver — supply voltage and protocol fit The DS8921AMX: The 1/1 driver/receiver count means it handles one differential pair in each direction — the typical configuration for a point-to-point or multi-drop RS-485 node where the bus master transmits on one pair and listens on another. The 70 mV receiver hysteresis provides noise immunity on long cable runs where ground potential differences and reflections eat into the signal margin. For a 5 V differential bus, that hysteresis represents about 1.4 % of the signal swing — enough to suppress chatter from slow edges without requiring external filtering. ## Temperature grade and board integration The 8-SOIC package (3.90 mm body width) matches the standard SOIC-8 footprint — no pad pitch surprises for a layout already using that land pattern. Surface-mount assembly with the 8-SOIC package means standard reflow profiles apply; the 0.154-inch (3.90 mm) body width is the narrow SOIC variant, so the pad spacing is 1.27 mm. No special handling beyond normal MSL precautions for a commercial-grade logic part. Note the RoHS non-compliant flag on this part. If your assembly requires RoHS-10/10 exemption-free compliance, confirm the date-code lot or consider the lead-free variant of this family. The non-compliant status means the original tin-lead finish is still available for legacy rework or mil-spec builds that explicitly allow it.","metaTitle":"Texas Instruments DS8921AMX RS-422/485 Transceiver, 5V","metaDescription":"Texas Instruments DS8921AMX, a 5V RS-422/485 full-duplex transceiver in 8-SOIC. Active production, sourced to order. 70 mV hysteresis, 0-70°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"Transceiver","Duplex":"Full","Package":"Bulk","Protocol":"RS422, RS485","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Receiver Hysteresis":"70 mV","Operating Temperature":"0°C ~ 70°C","Supplier Device Package":"8-SOIC","Number of Drivers/Receivers":"1/1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.63","stockQuantity":0,"priceTiers":[{"qty":473,"price":"$0.63000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6a1b57cd235d5569c7e5c1532f351835.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the alternatives for the DS8921AMX?","answer":"The SN65HVD233MDREP is a different protocol (CANbus, not RS-422/485), operates at 3.0 V, and uses half-duplex — it is not a functional replacement. For an RS-422/485 full-duplex 5 V transceiver in 8-SOIC, stay within the same TI family or an equivalent from a second-source vendor with matching pinout and supply voltage."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/DS8921AMX","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/DS8921AMX 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}}