{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FERD40H100STS","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"FERD40H100STS","canonicalUrl":"https://icboms.com/stmicroelectronics/FERD40H100STS","factsUrl":"https://icboms.com/api/mcp/products/FERD40H100STS","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics FERD40H100STS, FERD (Field Effect Rectifier Diode), 100 V reverse, 40 A average, 705 mV forward voltage at 40 A, Fast Recovery ≤ 500 ns, TO-220AB through-hole, 175°C junction, ROHS3 compliant.","salesMarkdown":"## 40 A rectifier with a lower Vf floor than a standard Schottky The STMicroelectronics FERD40H100STS is a 100 V, 40 A Field Effect Rectifier Diode (FERD) in a TO-220AB through-hole package. Its 705 mV typical forward voltage at 40 A is lower than what a conventional 100 V Schottky delivers at that current density, which directly cuts conduction losses in the rectification stage. At 40 A forward current the Vf is 705 mV, so the conduction loss is about 28 W. That figure sets the heatsink requirement. The junction is rated to 175°C, which gives headroom in a 85°C ambient if the heatsink is sized for the thermal resistance of the TO-220AB tab. Reverse leakage is 190 µA at 100 V — typical for a low-Vf rectifier. The trade-off is that the leakage climbs with junction temperature, so the thermal design should account for the leakage contribution at the operating point. ## Active production, ROHS3, through-hole package The TO-220AB through-hole package is a standard power footprint. For inventory planning, store the tubes in a dry environment — the part is not moisture-sensitive like a surface-mount power package, but the leads should be kept free of oxidation. ## FERD vs Schottky — the design trade-off A FERD (Field Effect Rectifier Diode) uses a field-effect structure to lower the forward voltage below what a planar Schottky of the same voltage rating can achieve. The trade-off is higher reverse leakage at elevated temperature compared to a Schottky. For a 100 V, 40 A output rectifier in a continuous-conduction PFC or a battery charger, the lower Vf saves several watts of conduction loss, which often outweighs the leakage penalty at junction temperatures up to 125°C.","metaTitle":"ST FERD40H100STS FERD Diode, 100V 40A TO-220AB, 705mV Vf","metaDescription":"ST FERD40H100STS Field Effect Rectifier Diode, 100V reverse, 40A average, 705mV forward voltage at 40A. TO-220AB through-hole. Active, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":[],"specifications":{"Speed":"Fast Recovery =< 500ns, > 200mA (Io)","Package":"Tube","Diode Type":"FERD (Field Effect Rectifier Diode)","Mounting Type":"Through Hole","Package / Case":"TO-220-3","lifecycle_stage":"eol_hot","Supplier Device Package":"TO-220AB","Current - Reverse Leakage @ Vr":"190 µA @ 100 V","Voltage - DC Reverse (Vr) (Max)":"100 V","Current - Average Rectified (Io)":"40A","Operating Temperature - Junction":"175°C (Max)","Voltage - Forward (Vf) (Max) @ If":"705 mV @ 40 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.48","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.57000","currency":"USD"},{"qty":10,"price":"$1.40300","currency":"USD"},{"qty":100,"price":"$1.09390","currency":"USD"},{"qty":500,"price":"$0.90366","currency":"USD"},{"qty":1000,"price":"$0.77788","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a191bbbbeb2477b46dc97e653a6e3e92.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is FERD40H100STS RoHS compliant?","answer":"Yes, it is ROHS3 compliant, meaning it meets the current RoHS exemption-free standard."},{"question":"What is the difference between FERD and Schottky diode?","answer":"A FERD uses a field-effect structure to achieve a lower forward voltage than a conventional Schottky of the same voltage rating. The trade-off is higher reverse leakage at elevated junction temperatures. For a 100 V, 40 A rectifier, the FERD's lower Vf reduces conduction losses in applications like PFC output stages and battery chargers."},{"question":"What is the operating junction temperature of FERD40H100STS?","answer":"The maximum operating junction temperature is 175°C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/FERD40H100STS","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/FERD40H100STS when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T16:33:54.282Z","lastPublished":"2026-07-16T16:33:54.282Z","indexable":true}}