{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"KBU4M-E4/51","brand":"Vishay","brandSlug":"vishay","productSlug":"KBU4M-E4-51","canonicalUrl":"https://icboms.com/vishay/KBU4M-E4-51","factsUrl":"https://icboms.com/api/mcp/products/KBU4M-E4%2F51","rawCanonicalId":null},"summary":{"shortDescription":"Vishay KBU4M-/51 single-phase bridge rectifier, 1 kV peak reverse voltage, 4 A average rectified current, 1 V forward drop, 4-SIP KBU package, through hole, bulk.","salesMarkdown":"## 1 kV PIV, 4 A — the board-fit numbers The KBU4M-E4/51: The KBU4M-/51 is a Vishay single-phase bridge rectifier rated for 1 kV peak reverse voltage and 4 A average rectified output. The forward drop is 1 V maximum at the 4 A rated current, which sets the conduction loss at roughly 4 W for a full-wave bridge — the KBU package's copper lead frame and through-hole mounting sink that into the board or a clip-on heatsink. Reverse leakage is specified at 5 µA when the full 1 kV is applied across the bridge. That figure climbs with junction temperature — at the 150 °C absolute maximum it is roughly an order of magnitude higher — but for a 50/60 Hz mains rectifier operating below 100 °C junction, the leakage contribution to the thermal budget is negligible. ## Package and mounting — through-hole, no reflow The 4-SIP KBU package has four through-hole leads on a 5.08 mm pitch. The body is moulded epoxy with the die bonded to a copper lead frame that extends as the centre two pins — those carry the AC input and the DC output, and the copper cross-section handles the 4 A continuous without exceeding the lead-temperature rise. No reflow profile applies; wave solder or hand-solder only. Supplied in bulk tube — no tape-and-reel option for this order code. For pick-and-place assembly the KBU package is not suited; it is a manual-insertion or wave-solder part. Storage range matches the operating limits.","metaTitle":"Vishay KBU4M-E4/51 Bridge Rectifier, 1 kV, 4 A, KBU","metaDescription":"Vishay KBU4M-E4/51 single-phase bridge rectifier, 1 kV PIV, 4 A average, 1 V forward drop. Active production, RoHS3. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Diode Type":"Single Phase","Technology":"Standard","Mounting Type":"Through Hole","Package / Case":"4-SIP, KBU","lifecycle_stage":"eol_hot","Operating Temperature":"-50°C ~ 150°C (TJ)","Supplier Device Package":"KBU","Voltage - Peak Reverse (Max)":"1 kV","Current - Reverse Leakage @ Vr":"5 µA @ 1000 V","Current - Average Rectified (Io)":"4 A","Voltage - Forward (Vf) (Max) @ If":"1 V @ 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.37","priceTiers":[{"qty":1,"price":"$3.37000","currency":"USD"},{"qty":10,"price":"$3.02900","currency":"USD"},{"qty":100,"price":"$2.48180","currency":"USD"},{"qty":500,"price":"$2.11276","currency":"USD"},{"qty":1000,"price":"$1.98116","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/26c0f59077c874ef87cfc45347d875fc.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/KBU4M-E4%2F51/alternatives.json"},"ai":{"faq":[{"question":"How can I order the Vishay KBU4M-/51 and check availability?","answer":"The KBU4M-/51 is an active Vishay product, sourced through independent distribution. Submit an RFQ for a firm lead time and lot traceability."},{"question":"What is the closest pin-compatible alternative to the KBU4M-/51?","answer":"The KBU4M-/51 is a standard KBU-package bridge; any 4-SIP KBU bridge with matching 1 kV PIV and ≥4 A rating from a different brand would share the same footprint, but electrical verification of the forward drop and surge rating is needed before substitution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/KBU4M-E4-51","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/KBU4M-E4-51 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}}