{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STPS40170CW","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STPS40170CW","canonicalUrl":"https://icboms.com/stmicroelectronics/STPS40170CW","factsUrl":"https://icboms.com/api/mcp/products/STPS40170CW","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STPS40170CW Schottky rectifier, dual common-cathode, 170 V Vr, 20 A per diode, 920 mV Vf at 20 A, TO-247-3 through-hole package, 175°C max junction temperature.","salesMarkdown":"## What this Schottky pair does in the power stage The 920 mV forward drop at 20 A is the figure to plug into your conduction-loss calculation for the heatsink. With a 175°C maximum junction temperature, this part handles the thermal stress of a tightly packed power supply or motor-drive output stage. The TO-247-3 through-hole package bolts directly to a heatsink — no surface-mount reflow profile to worry about, and it is easy to replace in rework. The 170 V Vr rating places this Schottky in the 120 V to 170 V DC bus range — think power-factor-correction stages, output rectification in 100 V to 120 V AC-input supplies, and freewheeling diodes in motor drives with a 120 V DC link. It is not a 200 V or 250 V part, so do not push it into a 240 V AC rectified bus without margin. The common-cathode configuration means the two anodes share the cathode connection, which is the typical layout for a center-tapped secondary or a half-bridge output — one package replaces two discrete TO-247s and saves board space. ## 20 A per diode — load budget and derating Each diode is rated for 20 A average rectified current. In a common-cathode pair, the total package current is 40 A if both diodes conduct equally, but the thermal limit is set by the junction temperature. At 20 A per diode the forward drop is 920 mV, which gives about 18.4 W conduction loss per diode — that is 36.8 W total. The TO-247-3 package with a proper heatsink can handle that, but you need to derate for ambient temperature above 25°C. The 30 µA reverse leakage at 170 V is low for a Schottky at this voltage, so standby losses in a power supply are manageable. No need to stockpile or hunt for a second source yet — but if you want a cross-reference for dual-sourcing, the common-cathode TO-247 Schottky family from other vendors is worth a look.","metaTitle":"STPS40170CW Schottky Rectifier, 170 V, 20 A, TO-247-3","metaDescription":"STPS40170CW dual common-cathode Schottky rectifier: 170 V Vr, 20 A per diode, 920 mV Vf at 20 A, 175°C Tj max. TO-247-3 through-hole. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Speed":"Fast Recovery =< 500ns, > 200mA (Io)","Series":"-","Package":"Tube","Technology":"Schottky","Mounting Type":"Through Hole","Package / Case":"TO-247-3","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"STPS40170","Diode Configuration":"1 Pair Common Cathode","Supplier Device Package":"TO-247-3","Current - Reverse Leakage @ Vr":"30 µA @ 170 V","Voltage - DC Reverse (Vr) (Max)":"170 V","Operating Temperature - Junction":"175°C (Max)","Voltage - Forward (Vf) (Max) @ If":"920 mV @ 20 A","Current - Average Rectified (Io) (per Diode)":"20A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.3800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cf411351a046367edb6d953ff4433c24.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STPS40170CW/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to STPS40170CW?","answer":"The STPS40170CW is a dual common-cathode Schottky in a TO-247-3 package. Pin-compatible alternatives from other manufacturers exist in the same package and voltage/current class — for example, parts rated at 170 V and 20 A per diode in a TO-247-3 common-cathode configuration. Verify the forward voltage and reverse leakage against your thermal budget before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STPS40170CW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STPS40170CW 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}}