{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SPA21N50C3XKSA1","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"SPA21N50C3XKSA1","canonicalUrl":"https://icboms.com/infineon/SPA21N50C3XKSA1","factsUrl":"https://icboms.com/api/mcp/products/SPA21N50C3XKSA1","rawCanonicalId":null},"summary":{"shortDescription":"Infineon CoolMOS™ N-channel MOSFET, SPA21N50C3XKSA1, 560 V drain-source, 21 A continuous drain, 190 mOhm Rds(on) at 10 V gate drive, TO-220 Full Pack through-hole package.","salesMarkdown":"## Obsolete — sourcing the SPA21N50C3XKSA1 today The 560 V drain-source breakdown voltage (Vdss) places this MOSFET in the 500–600 V class, suitable for offline flyback converters, PFC stages, and high-voltage DC-DC converters where the bus voltage can reach 400 VDC with margin for transients. Continuous drain current is rated 21 A at 25 °C case temperature (Tc), but the 34.5 W power dissipation ceiling in the TO-220 Full Pack package means the practical current at elevated ambient drops quickly — derate for the junction temperature limit of 150 °C. At 25 °C junction this is the conduction-loss floor; at 125 °C junction the on-resistance roughly doubles, so budget 380 mOhm for worst-case thermal design. ## Gate drive and switching considerations Total gate charge (Qg) is 95 nC at 10 V gate voltage. Input capacitance (Ciss) is 2400 pF at 25 V drain-source. This moderate capacitance keeps the switching losses manageable in hard-switched topologies, but the driver output impedance should be low enough to charge Ciss within the desired dead-time window. Gate-source voltage is limited to ±20 V maximum. This simplifies assembly but increases thermal resistance compared to a standard TO-220 with a bare tab. In practice, the junction-to-case thermal resistance limits the heat that can be extracted; a forced-air heatsink or larger thermal mass is needed to stay below 150 °C junction at high load. The full temperature range is useful for avionics, downhole, or outdoor telecom equipment where ambient can swing widely.","metaTitle":"Infineon SPA21N50C3XKSA1 CoolMOS N-Ch MOSFET, 560V 21A","metaDescription":"Infineon SPA21N50C3XKSA1 CoolMOS N-channel MOSFET, 560 Vdss, 21A, 190 mOhm Rds(on). Obsolete.","metaKeywords":null},"attributes":{"series":"CoolMOS™","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Infineon Technologies","Series":"CoolMOS™","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±20V","Technology":"MOSFET (Metal Oxide)","FET Feature":"-","Mounting Type":"Through Hole","Package / Case":"TO-220-3 Full Pack","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"3.9V @ 1mA","Base Product Number":"SPA21N50","Operating Temperature":"-55°C ~ 150°C (TJ)","Rds On (Max) @ Id, Vgs":"190mOhm @ 13.1A, 10V","Power Dissipation (Max)":"34.5W (Tc)","Supplier Device Package":"PG-TO220-3-31","Gate Charge (Qg) (Max) @ Vgs":"95 nC @ 10 V","Drain to Source Voltage (Vdss)":"560 V","Input Capacitance (Ciss) (Max) @ Vds":"2400 pF @ 25 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"21A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.0500","priceTiers":[{"qty":127,"price":"$2.37000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4981d86979631c3a16bfe2975631f364.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SPA21N50C3XKSA1/alternatives.json"},"ai":{"faq":[{"question":"Is SPA21N50C3XKSA1 obsolete?","answer":"Yes, Infineon lists the SPA21N50C3XKSA1 as Obsolete. No further factory production is planned. Sourcing is through surplus or broker channels."},{"question":"What is the Rds(on) of SPA21N50C3XKSA1?","answer":"This is specified at 25 °C junction; expect the value to approximately double at 125 °C junction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/SPA21N50C3XKSA1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/SPA21N50C3XKSA1 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}}