{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STP21N90K5","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STP21N90K5","canonicalUrl":"https://icboms.com/stmicroelectronics/STP21N90K5","factsUrl":"https://icboms.com/api/mcp/products/STP21N90K5","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SuperMESH5™ N-Channel MOSFET, STP21N90K5, 900V Vdss, 18.5A continuous drain, 299mOhm Rds(on) at 9A, 43nC gate charge, TO-220-3 through-hole package.","salesMarkdown":"## 900 V drain-source — the spec that picks the application The STP21N90K5: The 900 V Vdss rating suits high-voltage offline converters such as PFC boost stages and flyback supplies. ## On-resistance and gate charge — the switching loss pair That's the conduction loss anchor: at 9 A the dissipation is I²R = 24 W, which the 250 W package rating can handle with a proper heatsink. Gate charge totals 43 nC at 10 V — a moderate figure for a 900 V part, meaning the driver doesn't need to push hard. Input capacitance is 1645 pF at 100 V drain-source, which sets the switching speed ceiling; the driver's peak current and the gate resistor together determine the rise and fall times. ## Temperature range and what it buys the board The silicon handles avionics cold starts and engine-bay heat soak.","metaTitle":"STP21N90K5 N-Channel MOSFET, 900V, 18.5A, TO-220","metaDescription":"STP21N90K5 N-channel MOSFET from STMicroelectronics SuperMESH5™ series. 900V Vdss, 18.5A continuous drain, 299mOhm Rds(on). Active lifecycle, TO-220 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"SuperMESH5™","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±30V","Technology":"MOSFET (Metal Oxide)","FET Feature":"-","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Active","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"5V @ 100µA","Base Product Number":"STP21","Operating Temperature":"-55°C~150°C(TJ)","Rds On (Max) @ Id, Vgs":"299mOhm @ 9A, 10V","Power Dissipation (Max)":"250W (Tc)","Supplier Device Package":"TO-220","Gate Charge (Qg) (Max) @ Vgs":"43 nC @ 10 V","Drain to Source Voltage (Vdss)":"900 V","Input Capacitance (Ciss) (Max) @ Vds":"1645 pF @ 100 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"18.5A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.7300","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f5d113102b41c58fd4c06ca541316028.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STP21N90K5/alternatives.json"},"ai":{"faq":[{"question":"What is the Vds rating of the STP21N90K5?","answer":"The drain-to-source voltage (Vdss) is rated at 900 V. That is the maximum voltage the MOSFET can block when turned off — it defines the bus voltage ceiling for the converter design."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STP21N90K5","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STP21N90K5 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}}