{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT1781IS#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT1781ISPBF","canonicalUrl":"https://icboms.com/analog-devices/LT1781ISPBF","factsUrl":"https://icboms.com/api/mcp/products/LT1781IS%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LT1781IS#PBF, RS-232 Transceiver, Full Duplex, 2/2 Drivers/Receivers, 250 kBd, 4.5V-5.5V Supply, 400 mV Hysteresis, -40°C to 85°C, 16-SOIC, Tube.","salesMarkdown":"## RS-232 link for 5 V-only designs The LT1781IS#PBF is a full-duplex RS-232 transceiver with two drivers and two receivers. It operates on a 4.5 V to 5.5 V supply and supports a 250 kBd data rate with 400 mV receiver hysteresis. ## 250 kBd and 400 mV hysteresis — what they mean on the wire At 250 kBd the part handles the full RS-232 data rate. The 400 mV hysteresis prevents chatter on long cables without external buffers. ## Active lifecycle — no LTB clock ticking The LT1781IS#PBF carries an Active product status and is ROHS3 compliant. There is no last-time-buy window to track, no NRND flag, and no forced redesign horizon. For a BOM freeze or a long-production run, this part can be specified without scheduling an obsolescence review for the foreseeable future.","metaTitle":"LT1781IS#PBF RS-232 Transceiver, Full Duplex, 250 kBd","metaDescription":"LT1781IS#PBF is an Analog Devices RS-232 transceiver with full duplex, 250 kBd data rate, 2/2 drivers/receivers, 400 mV hysteresis, 4.5-5.5V supply, -40 to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Type":"Transceiver","Duplex":"Full","Package":"Tube","Protocol":"RS232","Data Rate":"250KBd","Mounting Type":"Surface Mount","Package / Case":"16-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Receiver Hysteresis":"400 mV","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"16-SO","Number of Drivers/Receivers":"2/2"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$10.84","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$10.84000","currency":"USD"},{"qty":10,"price":"$9.79300","currency":"USD"},{"qty":50,"price":"$9.33800","currency":"USD"},{"qty":100,"price":"$8.10810","currency":"USD"},{"qty":250,"price":"$7.74368","currency":"USD"},{"qty":500,"price":"$7.06040","currency":"USD"},{"qty":1000,"price":"$6.14938","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/17801f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is an equivalent part to LT1781IS#PBF?","answer":"The ADM1181AARWZ is a close functional second-source: full-duplex RS-232 transceiver, 2/2 drivers/receivers, 230 kbps data rate, 650 mV hysteresis, same 4.5 V supply and temperature range. The LT1781IS#PBF offers a slightly higher data rate (250 kBd) while the ADM1181AARWZ provides more receiver hysteresis for noisy environments."},{"question":"Can LT1781IS#PBF replace MAX232?","answer":"Yes, the LT1781IS#PBF is a functional replacement for a MAX232 in 5 V-only designs. Both are full-duplex RS-232 transceivers with 2/2 drivers/receivers in similar SOIC packages. The LT1781IS#PBF has 400 mV hysteresis versus the MAX232's typical 300 mV, giving better noise immunity on longer cable runs."},{"question":"What is the data rate of LT1781IS#PBF?","answer":"The data rate is 250 kBd."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT1781ISPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LT1781ISPBF 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}}