{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BD9E104FJ-E2","brand":"ROHM Semiconductor","brandSlug":"rohm","productSlug":"BD9E104FJ-E2","canonicalUrl":"https://icboms.com/rohm/BD9E104FJ-E2","factsUrl":"https://icboms.com/api/mcp/products/BD9E104FJ-E2","rawCanonicalId":null},"summary":{"shortDescription":"ROHM Semiconductor BD9E104FJ- step-down buck converter, adjustable output 1-13V, 1A, 570kHz, synchronous rectification, 8-SOIC (0.154\", 3.90mm Width) / 8-SOP-J, surface mount, -40°C to 85°C.","salesMarkdown":"## What the 570 kHz switching frequency means for your board The BD9E104FJ-E2: The BD9E104FJ- is a 1 A rated step-down (buck) converter from ROHM, switching at 570 kHz. That switching rate sits above the audible band and lets you use a physically smaller inductor than a 100 kHz part would — typically a 10-22 µH shielded ferrite core in the 4x4 mm footprint range. The trade-off is slightly higher switching losses in the internal FETs, but the synchronous rectifier recovers some of that by replacing the freewheeling diode drop with a low-Rds(on) FET. The adjustable output goes from 1 V up to 13 V, set by an external resistor divider. That 1 V minimum floor means it can power a 1.2 V or 1.0 V core rail if the feedback divider is trimmed correctly — useful for a mixed-voltage board where one regulator handles both the 3.3 V I/O and a sub-1.5 V logic rail. ## Package and board-fit — the 8-SOP-J footprint The SOP-J variant has a narrower lead form than standard SOIC — the exposed pad on the bottom side (if present) is the thermal slug. The datasheet's recommended land pattern should be followed for the pad dimensions; the thermal via array under the pad is what pulls heat from the die into the board copper. Without adequate thermal vias, the 1 A output at high input-output differential will push the junction temperature above the 85 °C ambient ceiling. ## Active production and compliance posture ROHM lists the BD9E104FJ- as Active. The part is ROHS3 compliant. For a BOM that needs a 1 A adjustable buck in an 8-pin SOIC footprint, this part is a current-production choice — no last-time-buy risk at this writing.","metaTitle":"BD9E104FJ-E2 ROHM Buck Converter, 1A, 570kHz, 8-SOP-J","metaDescription":"ROHM BD9E104FJ-E2 step-down buck converter, 1A output, 570kHz switching, 7-26V input, adjustable output 1-13V, 8-SOP-J. Active, ROHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Step-Down","Topology":"Buck","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Current - Output":"1A","Number of Outputs":"1","Output Configuration":"Positive","Frequency - Switching":"570kHz","Operating Temperature":"-40°C ~ 85°C","Synchronous Rectifier":"Yes","Voltage - Input (Max)":"26V","Voltage - Input (Min)":"7V","Voltage - Output (Max)":"13V","Supplier Device Package":"8-SOP-J","Voltage - Output (Min/Fixed)":"1V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.23","priceTiers":[{"qty":1,"price":"$1.23000","currency":"USD"},{"qty":10,"price":"$1.10400","currency":"USD"},{"qty":25,"price":"$1.04760","currency":"USD"},{"qty":100,"price":"$0.86060","currency":"USD"},{"qty":250,"price":"$0.80448","currency":"USD"},{"qty":500,"price":"$0.71094","currency":"USD"},{"qty":1000,"price":"$0.56127","currency":"USD"},{"qty":2500,"price":"$0.52950","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/1306ad409d89ba1a8027d25a4c6aec65.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BD9E104FJ-E2/alternatives.json"},"ai":{"faq":[{"question":"How can I order BD9E104FJ- or check stock?","answer":"The BD9E104FJ- is an active ROHM part, ROHS3 compliant. Submit an RFQ for your BOM quantity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/rohm/BD9E104FJ-E2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/rohm/BD9E104FJ-E2 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}}