{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN65HVD21AD","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN65HVD21AD","canonicalUrl":"https://icboms.com/texas-instruments/SN65HVD21AD","factsUrl":"https://icboms.com/api/mcp/products/SN65HVD21AD","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SN65HVD21AD, RS422/RS485 Transceiver, Half-Duplex, 5Mbps, 4.5V~5.5V, -40°C~85°C, 8-SOIC Package.","salesMarkdown":"At 5 Mbps, the SN65HVD21AD supports cable runs up to several hundred feet depending on cable capacitance and termination. The half-duplex architecture means the bus direction must be toggled via the driver enable, so firmware needs to manage the turn-around time after each transmission. For longer distances (above 1000 ft) or higher noise environments, dropping to a lower data rate like 250 kbps extends reach but requires a different transceiver variant. ## 5 V-only supply — no 3.3 V compatibility If your system runs a 3.3 V microcontroller, you will need level translation on the logic-side pins or choose a 3.3 V-rated RS-485 transceiver. The 130 mV hysteresis on the receiver inputs helps reject noise on long bus cables, a feature that matters more in industrial environments with motor drives or VFDs nearby.","metaTitle":"SN65HVD21AD RS-422/RS-485 Transceiver, 5 Mbps, 8-SOIC","metaDescription":"Texas Instruments SN65HVD21AD half-duplex RS-422/RS-485 transceiver, 5 Mbps data rate, 4.5V–5.5V supply, -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"Mfr":"Texas Instruments","Type":"Transceiver","Duplex":"Half","Series":"-","Package":"Tube","Protocol":"RS422, RS485","Data Rate":"5Mbps","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Base Product Number":"65HVD21","Receiver Hysteresis":"130 mV","Operating Temperature":"-40°C~85°C","Supplier Device Package":"8-SOIC","Number of Drivers/Receivers":"1/1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.1423","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SN65HVD21AD/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between SN65HVD21AD and SN65HVD21ADR?","answer":"The SN65HVD21AD ships in a tube, while the SN65HVD21ADR is the tape-and-reel variant. Electrical specifications are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN65HVD21AD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN65HVD21AD 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}}