{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS40L40CT","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS40L40CT","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS40L40CT","factsUrl":"https://icboms.com/api/mcp/products/STPS40L40CT","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS40L40CT, Schottky rectifier, 40 V DC reverse voltage, 20 A average rectified current per diode, 1 pair common cathode, TO-220-3 through-hole package, Tube.","salesMarkdown":"## 40 V, 20 A Schottky rectifier in a common-cathode TO-220 pair The forward voltage is specified at 530 mV at 20 A, which keeps conduction losses manageable in high-current low-voltage power conversion stages. The device is classified as a fast recovery rectifier with recovery time ≤ 500 ns at > 200 mA. ## Where this Schottky pair fits in a power stage Common-cathode dual diodes like this one are typically used as output rectifiers in switch-mode power supplies, OR-ing diodes in redundant power feeds, and freewheeling diodes in motor drive or inverter stages. The 40 V blocking voltage suits 12 V and 24 V rails with margin, and the 20 A per-diode rating handles continuous loads in the 10–15 A range per leg when derated. The Schottky technology gives fast switching with negligible reverse recovery charge, which reduces switching losses in high-frequency converters. Buyers should qualify any alternate or replacement part for fit, thermal performance, and electrical margin before committing the BOM line. The 40 V reverse voltage rating sets the maximum DC bus voltage this rectifier can block. In a 24 V system with 20% transient headroom, the margin is comfortable; in a 48 V nominal rail the margin disappears. The 530 mV forward drop at 20 A gives a conduction loss of roughly 10.6 W per diode at full rated current, which drives the thermal management requirement. The 800 µA reverse leakage at 40 V is typical for a 40 V Schottky and should be factored into standby loss budgets.","metaTitle":"STPS40L40CT Schottky Rectifier","metaDescription":"STPS40L40CT Schottky diode, 40V Vr, 20A per diode, 530mV Vf at 20A, TO-220-3 common cathode pair. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Speed":"Fast Recovery =< 500ns, > 200mA (Io)","Series":"-","Package":"Tube","Technology":"Schottky","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Base Product Number":"STPS40","Diode Configuration":"1 Pair Common Cathode","Supplier Device Package":"TO-220","Current - Reverse Leakage @ Vr":"800 µA @ 40 V","Voltage - DC Reverse (Vr) (Max)":"40 V","Operating Temperature - Junction":"150°C (Max)","Voltage - Forward (Vf) (Max) @ If":"530 mV @ 20 A","Current - Average Rectified (Io) (per Diode)":"20A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3fcac6c632de37d466d011ba98234b76.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS40L40CT/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between the STPS40L40CT and the STPS40L60CT?","answer":"The primary difference is the reverse voltage rating. The STPS40L40CT is rated for 40 V maximum DC reverse voltage, while the STPS40L60CT is rated for 60 V. Both share the same TO-220-3 common-cathode package and 20 A per-diode current rating. The 60 V variant provides additional headroom for higher-voltage rails or systems with larger transients."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS40L40CT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS40L40CT 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}}