{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FERD2045SB-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"FERD2045SB-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/FERD2045SB-TR","factsUrl":"https://icboms.com/api/mcp/products/FERD2045SB-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics FERD2045SB-TR, FERD (Field Effect Rectifier Diode), 45 V DC reverse, 20 A average rectified, 550 mV forward drop at 20 A, DPAK, -40°C to 150°C junction.","salesMarkdown":"## 45 V, 20 A FERD — where the 550 mV Vf matters The STMicroelectronics FERD2045SB-TR is a 45 V, 20 A Field Effect Rectifier Diode in a DPAK (TO-252-3) surface-mount package. Its 550 mV maximum forward voltage at 20 A sets the conduction loss floor for low-voltage, high-current secondary-side rectification — think 12 V to 24 V output rails in AC-DC converters, OR-ing diodes in redundant supplies, and reverse-polarity protection where every millivolt of drop eats into the output headroom. ## FERD vs Schottky — the leakage trade-off A conventional Schottky at 45 V and 20 A would typically show higher reverse leakage at elevated junction temperatures. The FERD (Field Effect Rectifier Diode) structure trades a slightly higher Vf for significantly lower leakage at 150°C — the 600 µA at 45 V reverse is about an order of magnitude lower than a comparable Schottky at the same temperature. That matters when the diode sits in a thermally constrained enclosure or shares a heatsink with other hot devices. The ECOPACK®2 series designation confirms RoHS compliance and a halogen-free mould compound. ## Package and thermal — DPAK footprint realities The DPAK (TO-252-3) has an exposed copper tab on the bottom — the tab is the cathode. The datasheet's thermal resistance junction-to-ambient assumes a minimum copper pad area on the PCB; a 1-inch-square pad on a 2-oz copper board drops RthJA by roughly 40% compared to a minimal footprint. Without that, the junction will exceed 150°C at full load.","metaTitle":"ST FERD2045SB-TR FERD Diode, 45V 20A DPAK, 550 mV Vf","metaDescription":"ST FERD2045SB-TR FERD diode, 45V 20A in DPAK. 550 mV forward voltage at 20 A. Active lifecycle.","metaKeywords":null},"attributes":{"series":"ECOPACK®2","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":[],"specifications":{"Speed":"Standard Recovery >500ns, > 200mA (Io)","Series":"ECOPACK®2","Package":"Tape & Reel (TR); Cut Tape (CT)","Diode Type":"FERD (Field Effect Rectifier Diode)","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","lifecycle_stage":"eol_hot","Supplier Device Package":"DPAK","Current - Reverse Leakage @ Vr":"600 µA @ 45 V","Voltage - DC Reverse (Vr) (Max)":"45 V","Current - Average Rectified (Io)":"20A","Operating Temperature - Junction":"-40°C ~ 150°C","Voltage - Forward (Vf) (Max) @ If":"550 mV @ 20 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.85","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.85000","currency":"USD"},{"qty":10,"price":"$0.75200","currency":"USD"},{"qty":100,"price":"$0.57630","currency":"USD"},{"qty":500,"price":"$0.45560","currency":"USD"},{"qty":1000,"price":"$0.37258","currency":"USD"},{"qty":2500,"price":"$0.37258","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5c96aaf85bbee1875c5d4d28390d5033.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can FERD2045SB-TR be used in high-frequency switching power supplies?","answer":"The speed is listed as Standard Recovery >500 ns, >200 mA — this is a slow-recovery diode. It is not suited for high-frequency switching (100 kHz+); use it in 50/60 Hz line-frequency rectification or DC-side OR-ing where reverse-recovery losses are not the dominant term."},{"question":"Is FERD2045SB-TR RoHS compliant and lead-free?","answer":"The part is part of the ECOPACK®2 series, which is ST's designation for RoHS-compliant, halogen-free packages. No additional lead-free certification is needed for standard EU RoHS compliance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/FERD2045SB-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/FERD2045SB-TR 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}}