{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6391","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N6391","canonicalUrl":"https://icboms.com/microchip/1N6391","factsUrl":"https://icboms.com/api/mcp/products/1N6391","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N6391, Military MIL-PRF-19500/553 Schottky diode, 45 V reverse, 25 A average, fast recovery <500 ns, DO-203AA (DO-4) stud mount, bulk.","salesMarkdown":"The 1N6391 is a 45 V, 25 A Schottky rectifier in a DO-203AA (DO-4) stud-mount package, qualified to MIL-PRF-19500/553. The 45 V reverse voltage covers 24 V and 28 V rails with margin; the 25 A average rating is the DC output current the junction can sustain with the stud bolted to a heatsink. Forward voltage is 500 mV at 5 A — at 25 A the Vf will be higher due to the resistive slope of the Schottky barrier, but the 500 mV figure at 5 A gives a baseline for conduction loss in the lower part of the load range. ## Fast recovery in a Schottky — why the speed spec matters The speed classification is Fast Recovery =< 500 ns at > 200 mA. For a Schottky diode, recovery is majority-carrier dominated — there is no stored charge to sweep out, so the 500 ns ceiling is conservative and reflects the test circuit's turn-off conditions rather than the intrinsic physics. In practice a Schottky of this voltage class switches in tens of nanoseconds, which keeps reverse-recovery losses negligible in a 50 kHz or 100 kHz converter. Junction capacitance is 2000 pF at 5 V reverse bias. That capacitance stores charge that must be delivered each switching cycle; at 100 kHz the capacitive switching loss is roughly 0.5 × C × V² × f, or about 0.2 W at 45 V — a manageable fraction of the total dissipation. ## Active production and military pedigree RoHS non-compliant — the leads and internal construction use tin-lead solder and plating. For a military or high-reliability BOM that allows lead-bearing finishes, this is the correct part; for a RoHS-mandated line, a tin-plated alternative would be needed. ## Stud-mount integration — what the package tells you DO-203AA (also known as DO-4) is a 1/4-28 threaded stud package. The anode is the stud and base; the cathode is the top terminal. The stud must be torqued into a tapped heatsink or chassis with a thermal compound interface — the junction-to-case thermal path is through the stud, so the mounting torque and surface finish directly set the thermal resistance. The 175°C maximum is typical for a Schottky; leakage current doubles roughly every 10°C above 25°C, so at 150°C junction the 1.5 mA reverse leakage at 45 V becomes a significant contributor to self-heating and must be included in the thermal budget.","metaTitle":"1N6391 Schottky Diode 45V 25A DO-203AA, Fast Recovery","metaDescription":"1N6391 Schottky diode, 45V 25A, fast recovery <500ns, DO-203AA stud mount. Active production, MIL-PRF-19500/553 qualified. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":"Military, MIL-PRF-19500/553","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Microchip Technology","Speed":"Fast Recovery =< 500ns, > 200mA (Io)","Series":"-","Packaging":"Bulk","Technology":"Schottky","Part Status":"Active","Mounting Type":"Stud Mount","Package / Case":"DO-203AA, DO-4, Stud","lifecycle_stage":"eol_hot","Base Product Number":"1N6391","Capacitance @ Vr, F":"2000pF @ 5V, 1MHz","Supplier Device Package":"DO-203AA (DO-4)","Current - Reverse Leakage @ Vr":"1.5 mA @ 45 V","Voltage - DC Reverse (Vr) (Max)":"45 V","Current - Average Rectified (Io)":"25A","Operating Temperature - Junction":"-55°C ~ 175°C","Voltage - Forward (Vf) (Max) @ If":"500 mV @ 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$55.3600","priceTiers":[{"qty":1,"price":"$55.36000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/630857e2b8d8dd8dcb7c9ade640aee1f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6391/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Microchip provide for the 1N6391?","answer":"The 1N6391 is RoHS non-compliant due to lead-bearing finishes. Microchip provides the MIL-PRF-19500/553 qualification test data and a certificate of compliance for the military specification. No UL or IEC certification is listed for this part; the qualification standard is the MIL-PRF-19500 slash sheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N6391","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N6391 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}}