{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS640CT","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS640CT","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS640CT","factsUrl":"https://icboms.com/api/mcp/products/STPS640CT","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS640CT, Schottky rectifier, 1 Pair Common Cathode, 40 V DC reverse, 3 A average per diode, 630 mV forward drop, TO-220-3 through-hole, Fast Recovery ≤ 500 ns.","salesMarkdown":"## Schottky pair in a TO-220 — what the ratings tell you The STPS640CT is a dual Schottky rectifier in a common-cathode configuration, rated 40 V reverse voltage and 3 A average forward current per diode. ## 630 mV forward drop — the thermal budget driver At 3 A per diode, the forward voltage is 630 mV maximum — that's about 1.9 W per diode at full load. In a TO-220 package with a heatsink tab, the junction temperature stays under the 150°C maximum if the thermal path is managed. The 100 µA reverse leakage at 40 V is typical for a 40 V Schottky; leakage rises with temperature, so the thermal design should account for it at elevated junction temperatures. ## Obsolete — plan your BOM around surplus sourcing STMicroelectronics lists the STPS640CT as obsolete. No official successor is recorded in the lifecycle entry. If you are stocking spares or supporting a legacy board, this is a last-time-buy candidate; once the surplus channel dries up, the only option is a pin-compatible substitute from the same Schottky family. ## Through-hole TO-220 — board-fit checklist The TO-220-3 package with through-hole leads mates into a standard 0.100-inch pitch footprint. The common-cathode pair shares the centre tab, so the PCB layout must connect the tab to the output rail and route the two anodes to separate input phases or windings. The tube shipment means the parts arrive in anti-static tubes; store them in the tube until placement to avoid lead damage.","metaTitle":"STPS640CT Schottky Rectifier, 40V 3A Common Cathode, TO-220","metaDescription":"STPS640CT Schottky diode, 40V reverse, 3A per diode, 630mV forward voltage. TO-220-3, common cathode pair.","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":"STPS64","Diode Configuration":"1 Pair Common Cathode","Supplier Device Package":"TO-220","Current - Reverse Leakage @ Vr":"100 µA @ 40 V","Voltage - DC Reverse (Vr) (Max)":"40 V","Operating Temperature - Junction":"150°C (Max)","Voltage - Forward (Vf) (Max) @ If":"630 mV @ 3 A","Current - Average Rectified (Io) (per Diode)":"3A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/0440581d7339b43da7962c03f5839e9e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS640CT/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to STPS640CT?","answer":"No official cross-reference or second-source alternate is recorded in the lifecycle data. A pin-compatible substitute would need to match the TO-220-3 common-cathode Schottky footprint with a 40 V, 3 A per diode rating. Check the STPS6xx or MBR series from other manufacturers for a drop-in candidate, but verify the forward voltage and leakage before committing the BOM."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS640CT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS640CT 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}}