{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS340AFN","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS340AFN","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS340AFN","factsUrl":"https://icboms.com/api/mcp/products/STPS340AFN","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS340AFN, Schottky diode, 40 V DC reverse, 3 A average rectified, 630 mV forward drop at 3 A, fast recovery ≤500 ns, DO-221AC SMA Flat Leads, surface mount.","salesMarkdown":"## 40 V, 3 A Schottky in a low-profile SMA Flat Leads package The STPS340AFN is a 40 V, 3 A Schottky rectifier from STMicroelectronics, built for low forward voltage drop and fast switching in a compact surface-mount package. Its 630 mV maximum forward drop at 3 A keeps conduction losses manageable in a 3 A rail, while the fast recovery time — ≤500 ns above 200 mA — suits it for moderate-speed rectification and freewheeling in DC-DC converters and output OR-ing stages. ## Ratings that size the thermal and electrical budget The 40 V reverse voltage (Vr max) gives about 20 % headroom on a 24 V rail or 30 % on a 12 V rail — adequate for most low-voltage power supplies, but tight for 48 V bus applications. Reverse leakage is specified at 20 µA at 40 V — a typical Schottky figure that rises exponentially with temperature. For new designs or BOM sustainment, the closest functional peer is the standard STPS340 series in the SMA Flat Leads package — the base product number STPS340 covers the same die in other package variants.","metaTitle":"STPS340AFN Schottky Diode, 40 V 3 A","metaDescription":"STPS340AFN Schottky rectifier, 40 V reverse, 3 A average, 630 mV Vf at 3 A. DO-221AC SMA Flat Leads package.","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":"Tape & Reel (TR); Cut Tape (CT)","Diode Type":"Schottky","Mounting Type":"Surface Mount","Package / Case":"DO-221AC, SMA Flat Leads","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Base Product Number":"STPS340","Capacitance @ Vr, F":"-","Supplier Device Package":"SMAflat Notch","Current - Reverse Leakage @ Vr":"20 µA @ 40 V","Voltage - DC Reverse (Vr) (Max)":"40 V","Current - Average Rectified (Io)":"3A","Operating Temperature - Junction":"150°C","Voltage - Forward (Vf) (Max) @ If":"630 mV @ 3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/a26ed2b171bdd3da9ab6fea92251be8b.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS340AFN/alternatives.json"},"ai":{"faq":[{"question":"Is STPS340AFN obsolete?","answer":"Yes, the STPS340AFN is listed as Obsolete. No official replacement part number has been issued by STMicroelectronics."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS340AFN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS340AFN 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}}