{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STF12NM50ND","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STF12NM50ND","canonicalUrl":"https://icboms.com/stmicroelectronics/STF12NM50ND","factsUrl":"https://icboms.com/api/mcp/products/STF12NM50ND","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics FDmesh™ II series, STF12NM50ND, N-Channel MOSFET, 500 Vdss, 11 A Id, 380 mOhm Rds(on), 30 nC Qg, TO-220-3 Full Pack, Through Hole, 150°C junction.","salesMarkdown":"## 500 V, 11 A N-channel in a fully isolated TO-220FP This simplifies assembly and reduces thermal interface resistance in offline power supplies and flyback converters where the heatsink may be at chassis potential. These figures place the STF12NM50ND in a moderate-speed class — suitable for hard-switched topologies in the 50–150 kHz range where the gate-drive current requirement stays under 150 mA. Maximum power dissipation is 25 W at case temperature, with the junction rated to 150 °C. In a typical flyback converter dissipating 10–15 W, the TO-220FP's junction-to-case thermal path through the full-pack moulding runs about 5–6 °C/W — budget a heatsink with adequate surface area to keep the junction below 125 °C for reliable operation. STMicroelectronics lists the STF12NM50ND as obsolete. For new designs, evaluate the STF12NM50N (non-isolated TO-220) or a current FDmesh™ II or MDmesh™ series part with similar 500 V / 11 A ratings; the TO-220FP footprint is specific to the full-pack variant. Availability is limited to surplus and broker-channel inventory.","metaTitle":"STF12NM50ND N-Channel MOSFET, 500 V, 11 A, FDmesh II","metaDescription":"STF12NM50ND N-channel MOSFET, 500 Vdss, 11 A continuous drain, 380 mOhm Rds(on). TO-220 Full Pack isolated package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"FDmesh™ II","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±25V","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":"5V @ 250µA","Base Product Number":"STF12","Operating Temperature":"150°C(TJ)","Rds On (Max) @ Id, Vgs":"380mOhm @ 5.5A, 10V","Power Dissipation (Max)":"25W (Tc)","Supplier Device Package":"TO-220FP","Gate Charge (Qg) (Max) @ Vgs":"30 nC @ 10 V","Drain to Source Voltage (Vdss)":"500 V","Input Capacitance (Ciss) (Max) @ Vds":"850 pF @ 50 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"11A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.1000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"Is the STF12NM50ND obsolete?","answer":"Yes, STMicroelectronics has marked the STF12NM50ND as obsolete. There is no official successor part listed. For replacement, consider a current FDmesh™ II or MDmesh™ series MOSFET with similar 500 V / 11 A ratings in a TO-220FP or standard TO-220 package, depending on the isolation requirement."},{"question":"What is the difference between STF12NM50ND and STF12NM50N?","answer":"The STF12NM50ND is the fully isolated TO-220 Full Pack variant; the STF12NM50N is the standard TO-220 with a non-isolated metal tab. The electrical ratings (500 V, 11 A, 380 mOhm) are the same, but the ND version does not require an insulating washer between the device and the heatsink."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STF12NM50ND","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STF12NM50ND 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}}