{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"KBU4D-E4/51","brand":"Vishay","brandSlug":"vishay","productSlug":"KBU4D-E4-51","canonicalUrl":"https://icboms.com/vishay/KBU4D-E4-51","factsUrl":"https://icboms.com/api/mcp/products/KBU4D-E4%2F51","rawCanonicalId":null},"summary":{"shortDescription":"Vishay KBU4D-/51, Single Phase Bridge Rectifier, Standard Technology, 200 V Peak Reverse, 4 A Average, 4-SIP KBU Package, Through Hole, Tray.","salesMarkdown":"## What it is and what it does on the board The KBU4D-E4/51: The Vishay KBU4D-/51 is a single-phase bridge rectifier in the standard KBU through-hole package — four diodes in one SIP body that converts AC to pulsed DC. It is rated for 200 V peak reverse voltage and 4 A average rectified output, which covers common low-voltage power supplies, battery chargers, and general-purpose DC bus rails up to about 140 V RMS input. For a 4 A output, expect about 4 W of heat inside the bridge, which the KBU package dissipates through the leads into the PCB copper or a clip-on heatsink. ## Package and mounting — what fits where The KBU is a 4-pin single-in-line package with a 0.100-inch (2.54 mm) pitch between the AC and DC terminals. It mounts through hole, so it swaps onto a standard PCB without a hot-air station — a soldering iron and a desoldering pump are all you need in the field. The body is a molded SIP with the die attached to a copper leadframe. The junction temperature range is -50°C to 150°C, which covers industrial enclosures and outdoor gear where the ambient inside the box can hit 85°C and the junction still has margin. ## Leakage and thermal behaviour at the bench Reverse leakage is specified at 5 µA max at the full 200 V peak reverse voltage. At 4 A forward, the 1 V drop means the device dissipates 4 W. In still air, the KBU package has a thermal resistance of about 20°C/W junction-to-ambient with minimal copper — so the junction rises roughly 80°C above ambient at full load. That leaves 70°C headroom to the 150°C max junction, which is comfortable for most environments but tight if the ambient is already 85°C. ## Lifecycle and compliance — what the record says It is ROHS3 compliant, so it passes the EU RoHS exemption list without restriction. The KBU package is a Vishay standard; if you need a drop-in alternative, the parametric match is another KBU-series bridge with the same voltage and current ratings — confirm the pinout matches your PCB layout.","metaTitle":"Vishay KBU4D-E4/51 Bridge Rectifier, 200V 4A, KBU","metaDescription":"Vishay KBU4D-E4/51 single-phase bridge rectifier, 200V peak reverse, 4A average, 1V forward drop. Active, ROHS3 compliant. KBU through-hole package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tray","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)":"200 V","Current - Reverse Leakage @ Vr":"5 µA @ 200 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":25,"price":"$2.86360","currency":"USD"},{"qty":80,"price":"$2.48188","currency":"USD"},{"qty":250,"price":"$2.35456","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/KBU4D-E4%2F51/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Vishay provide for the KBU4D-/51?","answer":"The part is ROHS3 compliant. Vishay typically provides a declaration of compliance; no UL or IEC certification is listed in the record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/KBU4D-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/KBU4D-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}}