{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS40SM120CTN","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS40SM120CTN","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS40SM120CTN","factsUrl":"https://icboms.com/api/mcp/products/STPS40SM120CTN","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS40SM120CTN Schottky diode, 1 Pair Common Cathode, 120 V DC reverse, 20 A average per diode, 830 mV forward drop at 20 A, TO-220-3 through-hole package.","salesMarkdown":"The STPS40SM120CTN is a dual Schottky rectifier from STMicroelectronics, configured as a common-cathode pair in a single TO-220-3 package. The fast-recovery characteristic (≤ 500 ns at > 200 mA) suits it for high-frequency switching supplies and output rectification where Schottky's low Vf and fast commutation reduce losses. The common-cathode layout pairs naturally with center-tapped transformer secondaries or as a dual OR-ing diode in redundant power feeds. ## Obsolete — no official successor on record STMicroelectronics lists the STPS40SM120CTN as Obsolete. No official replacement order code appears in the lifecycle record. A buyer holding a production requirement should qualify a pin-compatible Schottky pair from the same voltage/current class for dual-sourcing resilience. Housed in a TO-220-3 through-hole package, the part is through-hole mounted for heatsink attachment. The metal tab is the common cathode — insulate or ground it per the board's thermal and electrical plan. Junction temperature maxes at 150 °C, so the heatsink must keep the case temperature within the derating curve at 20 A continuous per diode. ## Leakage and reverse recovery Reverse leakage is specified at 275 µA at the full 120 V rating — a typical number for a 120 V Schottky at elevated temperature. The ≤ 500 ns recovery time (above 200 mA) is fast enough for most 50–100 kHz SMPS designs, though modern SiC or higher-voltage Schottky parts may offer lower Qrr for higher-frequency stages.","metaTitle":"STPS40SM120CTN Schottky Diode, 120V 20A Common Cathode","metaDescription":"STPS40SM120CTN Schottky rectifier, 120V reverse voltage, 20A average per diode, 830mV Vf at 20A, TO-220AB narrow leads.","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","Diode Type":"Schottky","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Base Product Number":"STPS40","Diode Configuration":"1 Pair Common Cathode","Supplier Device Package":"TO-220AB Narrow Leads","Current - Reverse Leakage @ Vr":"275 µA @ 120 V","Voltage - DC Reverse (Vr) (Max)":"120 V","Operating Temperature - Junction":"150°C(Max)","Voltage - Forward (Vf) (Max) @ If":"830 mV @ 20 A","Current - Average Rectified (Io) (per Diode)":"20A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.9200","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d188d97cdd690a960f4d04ed0719b4e0.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS40SM120CTN/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for STPS40SM120CTN?","answer":"STMicroelectronics has not published a direct replacement order code. For a production BOM, qualify a 120 V, 20 A common-cathode Schottky pair in TO-220-3 from the same voltage/current class; parametric equivalents from other vendors exist but require pin-to-pin and thermal verification."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS40SM120CTN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS40SM120CTN 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}}