{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS140AFN","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS140AFN","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS140AFN","factsUrl":"https://icboms.com/api/mcp/products/STPS140AFN","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS140AFN Schottky rectifier, 40 V reverse voltage, 1 A average rectified current, 550 mV forward drop at 1 A, SMA Flat Leads (DO-221AC) package, 150°C junction temperature.","salesMarkdown":"## Key ratings for a low-voltage Schottky A 40 V reverse voltage rating (Vr max) and 1 A average rectified current (Io) place this in the standard low-voltage, moderate-current Schottky class – common in secondary-side rectification, freewheeling diodes, and polarity protection in 5 V and 3.3 V rails. The forward drop of 550 mV at 1 A is typical for a 40 V Schottky of this die size; it keeps conduction losses manageable in a 1 A continuous load. Reverse leakage is 12 µA at 40 V – a figure to note if the circuit idles at high temperature, since Schottky leakage rises with junction heat. ## SMA Flat Leads – rework and layout notes The SMA Flat Leads package (DO-221AC) is a low-profile, surface-mount body with flat leads that sit flush against the pad – no gull-wing standoff. That makes it a clean fit for boards where height is a constraint, but it also means the solder joint is less forgiving of pad-to-pad coplanarity variation. Under a hot-air station, the flat leads heat quickly because there is less lead mass to soak; the risk is lifting the pad if you dwell too long. Pin 1 orientation is marked by a notch on the body (SMAflat Notch) – find it before placing.","metaTitle":"STPS140AFN Schottky Rectifier, 40V 1A","metaDescription":"STMicroelectronics STPS140AFN 40V 1A Schottky rectifier in SMA Flat Leads package. 550 mV forward drop at 1 A.","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":"STPS140","Capacitance @ Vr, F":"-","Supplier Device Package":"SMAflat Notch","Current - Reverse Leakage @ Vr":"12 µA @ 40 V","Voltage - DC Reverse (Vr) (Max)":"40 V","Current - Average Rectified (Io)":"1A","Operating Temperature - Junction":"150°C","Voltage - Forward (Vf) (Max) @ If":"550 mV @ 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4200","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1b733da3c11dddd97b49531d38a895d2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS140AFN/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS140AFN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS140AFN 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}}