{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SN75477DR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"SN75477DR","canonicalUrl":"https://icboms.com/texas-instruments/SN75477DR","factsUrl":"https://icboms.com/api/mcp/products/SN75477DR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SN75477DR peripheral driver, 2-element, 300mA sink per channel, 4.5V to 5.5V supply, 8-SOIC surface mount, 0°C to 70°C operating temperature.","salesMarkdown":"## 300 mA sink current — what it means for relay and solenoid drive The SN75477DR: The 300 mA per-channel sink rating is the headline load-driving spec. For a typical 5 V relay coil drawing 100–200 mA, one channel has comfortable headroom. Driving two relays simultaneously stays within the package's total dissipation limit, but the 8-SOIC body has limited copper area — if both channels run near 300 mA continuously, a thermal check on the PCB layout is prudent. The driver is a sink-only output (no high-side source), so the load connects between the positive supply and the driver output pin. ## Supply voltage and logic compatibility It accepts standard TTL or 5 V CMOS logic inputs directly. Do not feed it 3.3 V logic without a level translator — the input thresholds are not guaranteed to recognise a 3.3 V high as a valid logic 1 across the full supply range. ## Package and mounting The SOIC-8 footprint is standard and widely supported in assembly houses. No thermal pad — heat dissipation relies on the leadframe and PCB copper.","metaTitle":"SN75477DR Peripheral Driver, 300mA, 8-SOIC, Active","metaDescription":"Texas Instruments SN75477DR peripheral driver, 2 elements, 300mA sink, 4.5V-5.5V supply, 8-SOIC surface mount, 0°C to 70°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Logic Type":"Peripheral Driver","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Number of Elements":"2","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"8-SOIC","Current - Output High, Low":"-, 300mA","Number of Bits per Element":"1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.92","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.92000","currency":"USD"},{"qty":10,"price":"$0.82600","currency":"USD"},{"qty":25,"price":"$0.78360","currency":"USD"},{"qty":100,"price":"$0.64360","currency":"USD"},{"qty":250,"price":"$0.60164","currency":"USD"},{"qty":500,"price":"$0.53170","currency":"USD"},{"qty":1000,"price":"$0.41976","currency":"USD"},{"qty":2500,"price":"$0.39600","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/66711629cc8deea3422b30b7c9ecbd28.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can SN75477DR drive inductive loads like relays?","answer":"Yes. Each channel can sink 300 mA, which covers most small relay coils and solenoids. The driver includes internal clamp diodes for inductive kickback protection, though an external flyback diode across the load is still recommended for margin."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/SN75477DR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/SN75477DR 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}}