{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6628US","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N6628US","canonicalUrl":"https://icboms.com/microchip/1N6628US","factsUrl":"https://icboms.com/api/mcp/products/1N6628US","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N6628US fast recovery rectifier diode, 660 V reverse, 1.75 A average, 30 ns trr, SQ-MELF A package, bulk.","salesMarkdown":"## 660 V / 1.75 A fast recovery — the switching application fit The 1N6628US is a 660 V, 1.75 A fast recovery rectifier in a hermetic SQ-MELF package. Its 30 ns reverse recovery time (trr) places it in the class of diodes that can serve as the boost diode in a 100-200 kHz PFC stage, a snubber clamp in a flyback converter, or the output rectifier in a 400 VDC-bus telecom supply — where the recovery charge must stay low enough to avoid excessive switching loss in the MOSFET. The junction temperature range of -65 to +150 °C covers military and aerospace thermal profiles. A 400 VDC bus with 1.75 A average leaves derating margin for a 3-phase input stage that sees 800 V transients; the 660 V Vr rating handles those without avalanche stress. ## Package and board integration — SQ-MELF hermetic seal The SQ-MELF (A-MELF) package is a surface-mount, solderable, hermetic ceramic body with metallized end caps. It survives the thermal cycling of military-grade boards better than a plastic SMC or SMB — the coefficient of thermal expansion matches alumina substrates used in hybrid microcircuits. The 40 pF capacitance at 10 V reverse bias means the diode does not add significant capacitive loading in snubber or clamp positions. For a reflow line, the pick-and-place feeder must handle the MELF cylindrical body; the end-cap solder profile is the same as a standard 0805 or 1206 chip resistor. ## Forward drop and recovery trade-off At 1.35 V maximum forward drop at 2 A, the conduction loss is moderate — about 2.7 W at the rated 1.75 A average. The 30 ns trr is the reason the Vf is higher than a standard recovery rectifier; the lifetime killing that gives fast recovery also raises the on-state voltage. In a 200 kHz boost converter, the switching loss saved by the fast recovery outweighs the conduction penalty by a factor of 3-5×.","metaTitle":"Microchip 1N6628US Fast Recovery Diode, 660V 1.75A, 30ns trr","metaDescription":"Microchip Technology 1N6628US fast recovery rectifier diode, 660V reverse, 1.75A average, 30ns trr, SQ-MELF package. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Microchip Technology","Speed":"Fast Recovery =< 500ns, > 200mA (Io)","Series":"-","Packaging":"Bulk","Technology":"Standard","Part Status":"Active","Mounting Type":"Surface Mount","Package / Case":"SQ-MELF, A","lifecycle_stage":"eol_hot","Base Product Number":"1N6628","Capacitance @ Vr, F":"40pF @ 10V, 1MHz","Supplier Device Package":"A-MELF","Reverse Recovery Time (trr)":"30 ns","Current - Reverse Leakage @ Vr":"2 µA @ 660 V","Voltage - DC Reverse (Vr) (Max)":"660 V","Current - Average Rectified (Io)":"1.75A","Operating Temperature - Junction":"-65°C ~ 150°C","Voltage - Forward (Vf) (Max) @ If":"1.35 V @ 2 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$18.0000","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f5b0a05537ab86a0d8f4acc7b4ded0ad.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6628US/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the 1N6628US?","answer":"The 1N6628US is a unique combination of voltage, current, recovery speed, and hermetic package. For a non-hermetic application, a standard SMB or SMC package diode with similar ratings could be footprint-adapted, but the board layout would change."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N6628US","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N6628US 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}}