{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS40120CT","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS40120CT","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS40120CT","factsUrl":"https://icboms.com/api/mcp/products/STPS40120CT","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS40120CT, Schottky rectifier, 1 Pair Common Cathode, 120 V reverse, 20 A per diode, 900 mV forward drop at 20 A, 175°C junction, TO-220-3 through-hole package.","salesMarkdown":"The 900 mV forward drop at 20 A per diode is the number to budget for conduction loss — at full load each diode dissipates roughly 18 W, so the TO-220 package needs a proper heatsink or forced air to stay under the 175°C junction maximum. ## 175°C junction — the thermal ceiling The 175°C max junction temperature is a full-grade industrial rating. Derate the average current above 100°C case temperature per the datasheet curve — the 20 A per diode is only valid with the case held at a realistic temperature. In a 50°C ambient with a modest heatsink, expect to back off to about 12–14 A per diode to keep junction margin. The TO-220 tab is the cathode, so the common-cathode pair shares the same electrical node on the tab — useful for bolting to a shared heatsink without an insulator pad, provided the heatsink is at the cathode potential.","metaTitle":"STPS40120CT Schottky Rectifier","metaDescription":"STPS40120CT dual Schottky rectifier: 120V reverse, 20A per diode, 900mV Vf at 20A, 175°C junction, TO-220-3. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","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":"Active","lifecycle_stage":"eol_hot","Base Product Number":"STPS40120","Diode Configuration":"1 Pair Common Cathode","Supplier Device Package":"TO-220","Current - Reverse Leakage @ Vr":"25 µA @ 120 V","Voltage - DC Reverse (Vr) (Max)":"120 V","Operating Temperature - Junction":"175°C (Max)","Voltage - Forward (Vf) (Max) @ If":"900 mV @ 20 A","Current - Average Rectified (Io) (per Diode)":"20A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.2700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/69625ccc5cf805b1e3a133f209d99dcb.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS40120CT/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS40120CT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS40120CT 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}}