{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STP9NM50N","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STP9NM50N","canonicalUrl":"https://icboms.com/stmicroelectronics/STP9NM50N","factsUrl":"https://icboms.com/api/mcp/products/STP9NM50N","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STP9NM50N, MDmesh™ N-Channel MOSFET, 500 V Vdss, 5 A continuous drain, 560 mOhm Rds(on) at 10 V gate drive, TO-220-3 through-hole package, -55°C to 150°C junction temperature.","salesMarkdown":"## 500 V MDmesh™ N-channel — what it was built for It was designed for hard-switching topologies in off-line power supplies, adapters, and lighting ballasts where 500 V blocking and moderate current handling are the fit criteria. No last-time-buy window or successor part number is recorded in the official lifecycle data. The 500 V, 5 A, TO-220 N-channel MOSFET space is densely populated; any substitute must match the gate threshold voltage (4 V max at 250 µA) and the 10 V drive voltage for rated Rds(on) to avoid re-characterising the gate drive circuit. ## Ratings that decide the fit The 500 V Vdss sets the maximum DC bus voltage it can block — 400 V nominal PFC rails or 310 V rectified mains are within margin, but 600 V bus designs need a higher-rated device. The 5 A continuous drain at 25°C case temperature is the thermal limit; at elevated case temperatures the current must be derated per the datasheet curve. The 560 mOhm Rds(on) at 10 V gate drive determines conduction loss — at 3.7 A the dissipation is about 7.7 W, which the 70 W maximum power dissipation can handle with a properly sized heatsink. Gate charge of 20 nC at 10 V is modest, keeping drive losses low in switching applications up to the 100 kHz range. ## Package and mounting — no reflow surprises There is no moisture sensitivity level concern — through-hole parts are not reflow-soldered, so no bake-before-place step is needed. The mounting hole and lead spacing match industry-standard TO-220 footprints.","metaTitle":"STP9NM50N N-Channel MOSFET, 500V, 5A, TO-220, Obsolete","metaDescription":"STP9NM50N N-Channel MOSFET, 500V Vdss, 5A Id, 560mOhm Rds(on), TO-220 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"MDmesh™","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±25V","Technology":"MOSFET (Metal Oxide)","FET Feature":"-","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"4V @ 250µA","Base Product Number":"STP9N","Operating Temperature":"-55°C ~ 150°C (TJ)","Rds On (Max) @ Id, Vgs":"560mOhm @ 3.7A, 10V","Power Dissipation (Max)":"70W (Tc)","Supplier Device Package":"TO-220","Gate Charge (Qg) (Max) @ Vgs":"20 nC @ 10 V","Drain to Source Voltage (Vdss)":"500 V","Input Capacitance (Ciss) (Max) @ Vds":"570 pF @ 50 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"5A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b7a797cf4af7d23d402b94ad8a4295b0.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STP9NM50N/alternatives.json"},"ai":{"faq":[{"question":"What is the Rds(on) of STP9NM50N?","answer":"This is the value to use for worst-case conduction loss calculations in the power stage."},{"question":"What is the replacement for STP9NM50N?","answer":"No official replacement is recorded in the lifecycle data. A pin-compatible substitute would need to match the 500 V Vdss, 5 A continuous drain rating, TO-220 package, and 4 V maximum gate threshold voltage at 250 µA. The 500 V N-channel TO-220 MOSFET market offers several candidates, but the gate drive voltage and Rds(on) must be verified against the existing circuit design before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STP9NM50N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STP9NM50N 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}}