{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BAS40-04B5000","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"BAS40-04B5000","canonicalUrl":"https://icboms.com/infineon/BAS40-04B5000","factsUrl":"https://icboms.com/api/mcp/products/BAS40-04B5000","rawCanonicalId":null},"summary":{"shortDescription":"Infineon BAS40-04B5000, Automotive AEC-Q101 Schottky Diode, 1 Pair Series Connection, 40 V DC Reverse Voltage, 120 mA Average Rectified Current per Diode, 1 V Forward Voltage at 40 mA, SOT-23-3 Package, Surface Mount.","salesMarkdown":"## What this Schottky pair does on the board The Infineon BAS40-04B5000 is a dual series-connected Schottky diode in a SOT-23-3 package, qualified to AEC-Q101 for automotive and high-reliability applications. Each diode handles 120 mA average rectified current with a 40 V reverse voltage rating, and the Schottky construction gives a forward voltage of 1 V at 40 mA — fast switching with low forward drop for signal-level rectification, clamping, and OR-ing in 12 V and 24 V automotive buses. ## 40 V reverse voltage and 120 mA — where the margin lands The 40 V reverse voltage gives comfortable headroom on a 12 V nominal rail (derated 50% for load-dump transients) and still holds margin on a 24 V system. The 120 mA per-diode average current covers signal-level loads like relay coil flyback clamping, logic-level translation, and small-signal rectification. Reverse leakage is 1 µA at 30 V, which keeps quiescent draw low in battery-connected modules. The AEC-Q101 qualification means this part has passed the automotive stress tests: temperature cycling, high-temperature reverse bias, and humidity. It is rated for a junction temperature of 150°C, so it can sit near hot components in an under-hood ECU or a transmission control module without derating the life target. ## Package and footprint — SOT-23-3 The SOT-23-3 (TO-236-3 / SC-59) footprint is a standard three-lead small-signal package. The supplier device package is PG-SOT23. It is a surface-mount part, so it reflows with the rest of the board. No special thermal pad or via pattern needed at 120 mA — the junction stays well within the 150°C limit with standard copper traces.","metaTitle":"BAS40-04B5000 Schottky Diode, 40V 120mA, AEC-Q101, SOT-23","metaDescription":"Infineon BAS40-04B5000 dual series Schottky diode, 40V reverse voltage, 120mA average rectified current per diode, AEC-Q101 qualified, SOT-23 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Infineon Technologies","Speed":"Small Signal =< 200mA (Io), Any Speed","Series":"Automotive, AEC-Q101","Package":"Bulk","Diode Type":"Schottky","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Active","lifecycle_stage":"eol_hot","Diode Configuration":"1 Pair Series Connection","Supplier Device Package":"PG-SOT23","Current - Reverse Leakage @ Vr":"1 µA @ 30 V","Voltage - DC Reverse (Vr) (Max)":"40 V","Operating Temperature - Junction":"150°C","Voltage - Forward (Vf) (Max) @ If":"1 V @ 40 mA","Current - Average Rectified (Io) (per Diode)":"120mA (DC)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.0200","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8f6cd2d3ea2609775832c074f4cfd4da.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to BAS40-04B5000?","answer":"The BAS40-04B5000 is a series-connected dual Schottky in SOT-23. Pin-compatible alternatives include the BAT54 series (also series-connected dual Schottky in SOT-23) from various manufacturers, but the BAT54 typically has a 30 V reverse voltage rating versus 40 V for this part. Verify the reverse voltage requirement before substituting — the 40 V headroom is the deciding factor for 24 V automotive applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/BAS40-04B5000","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/BAS40-04B5000 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}}