{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS340U","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS340U","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS340U","factsUrl":"https://icboms.com/api/mcp/products/STPS340U","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS340U Schottky rectifier, 40 V reverse, 3 A forward, fast recovery ≤500 ns, 630 mV Vf at 3 A, SMB surface-mount package, active production.","salesMarkdown":"The fast recovery characteristic (≤500 ns at >200 mA) means the diode switches off cleanly in a continuous-conduction-mode flyback or forward converter, reducing reverse-recovery losses compared to a standard rectifier. This matters most when the switching frequency is above 50 kHz — the recovery charge is small enough that snubber requirements are minimal. ## Current, voltage, and thermal budget At 3 A continuous, the SMB package dissipates roughly 1.9 W (3 A × 0.63 V). The 20 µA reverse leakage at 40 V is a room-temperature number; at 100 °C junction, expect leakage to dominate the thermal budget if the board is in a confined enclosure. The 40 V reverse rating provides a 16 V margin over a 24 V rail, which is adequate for most industrial and telecom supplies. For a 48 V bus, this part is not suitable — look at the STPS5H100 or similar 100 V Schottky in the same SMB footprint. No last-time-buy, no PCN for obsolescence.","metaTitle":"STPS340U Schottky Diode, 40 V 3 A, SMB, Active","metaDescription":"STPS340U Schottky diode: 40 V reverse, 3 A forward, 630 mV Vf at 3 A, fast recovery ≤500 ns. SMB surface-mount, active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","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-214AA, SMB","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"STPS340","Capacitance @ Vr, F":"-","Supplier Device Package":"SMB","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(Max)","Voltage - Forward (Vf) (Max) @ If":"630 mV @ 3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4200","priceTiers":[{"qty":1,"price":"$0.42000","currency":"USD"},{"qty":10,"price":"$0.35700","currency":"USD"},{"qty":100,"price":"$0.24790","currency":"USD"},{"qty":500,"price":"$0.19354","currency":"USD"},{"qty":1000,"price":"$0.15732","currency":"USD"},{"qty":2500,"price":"$0.14063","currency":"USD"},{"qty":5000,"price":"$0.13348","currency":"USD"},{"qty":12500,"price":"$0.12395","currency":"USD"},{"qty":25000,"price":"$0.12109","currency":"USD"},{"qty":62500,"price":"$0.11800","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/15140ac353d4c6ed29690238d09f6b62.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS340U/alternatives.json"},"ai":{"faq":[{"question":"Can STPS340U replace SS34?","answer":"The SS34 is a 40 V, 3 A Schottky in an SMA package. The STPS340U is in an SMB package (DO-214AA), which is slightly larger but pin-compatible with the SMA footprint on most boards. The electrical ratings are equivalent: 40 V reverse, 3 A forward. The STPS340U has a lower typical Vf (630 mV vs 0.5 V for SS34 at 3 A), so conduction losses are slightly higher. The SMB package offers better thermal dissipation than SMA. For a drop-in replacement, check the PCB pad geometry — SMB pads are wider than SMA, so a direct solder-paste stencil match may need verification."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS340U","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS340U 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}}