{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS40120CR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS40120CR","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS40120CR","factsUrl":"https://icboms.com/api/mcp/products/STPS40120CR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS40120CR, Schottky rectifier, 1 pair common cathode, 120 V DC reverse voltage, 20 A average rectified per diode, 900 mV forward drop at 20 A, fast recovery ≤500 ns, through-hole I2PAK (TO-262) package.","salesMarkdown":"## What this Schottky pair does in the circuit The STPS40120CR is a dual common-cathode Schottky rectifier from STMicroelectronics, rated for 120 V reverse voltage and 20 A average forward current per diode. It comes in a through-hole I2PAK (TO-262) package, with a fast recovery time ≤500 ns above 200 mA. The 900 mV forward drop at 20 A is typical for a 120 V Schottky, so conduction losses are predictable in a power supply output or PFC boost stage. The common-cathode configuration directly suits center-tapped transformer rectifiers and half-bridge topologies where two diodes share a single cathode node. ST lists the STPS40120CR as obsolete. For design-in or volume production, the buyer should verify fit with a cross-reference search against the 120 V, 20 A per-diode, common-cathode I2PAK spec. The 120 V reverse voltage gives headroom for 85–100 V DC rails in power-factor-correction stages or 48 V telecom rectifiers. The 20 A per-diode average current, combined with the 900 mV forward drop, means about 18 W conduction loss per diode at full load – the I2PAK package's thermal pad must be well heatsunk or the junction temperature will hit the 175°C maximum quickly. The fast recovery ≤500 ns matters for switching frequencies above 50 kHz where reverse-recovery losses in a standard diode would dominate; Schottky recovery is inherently fast, but this spec confirms it's rated for hard-switched converters.","metaTitle":"STPS40120CR Schottky Diode, 120 V 20 A, Fast Recovery, I2PAK","metaDescription":"STPS40120CR 120 V 20 A common-cathode Schottky rectifier in I2PAK. Fast recovery ≤500 ns.","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-262-3 Long Leads, I²Pak, TO-262AA","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Base Product Number":"STPS401","Diode Configuration":"1 Pair Common Cathode","Supplier Device Package":"I2PAK","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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/69625ccc5cf805b1e3a133f209d99dcb.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS40120CR/alternatives.json"},"ai":{"faq":[{"question":"Is the STPS40120CR obsolete?","answer":"Yes, STMicroelectronics lists the STPS40120CR as obsolete."},{"question":"What is the replacement for STPS40120CR?","answer":"No official replacement order code is published by ST. The closest fit would be another 120 V, 20 A per-diode, common-cathode Schottky in the I2PAK (TO-262) package – for example, parts from the STPS40xx family or a qualified second-source vendor. Pin compatibility and electrical ratings must be verified against the original datasheet before substitution."},{"question":"Where can I buy the STPS40120CR?","answer":"The STPS40120CR is obsolete through the factory channel, but it can be sourced through independent distribution. Submit an RFQ for a real-time supply picture."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS40120CR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS40120CR 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}}