{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"IRFB4321PBF","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"IRFB4321PBF","canonicalUrl":"https://icboms.com/infineon/IRFB4321PBF","factsUrl":"https://icboms.com/api/mcp/products/IRFB4321PBF","rawCanonicalId":null},"summary":{"shortDescription":"IRFB4321PBF, HEXFET N-Channel MOSFET, 150 Vdss, 85 A continuous, 15 mOhm Rds(on) at 33 A, 10 V, TO-220-3, -55°C to 175°C junction temperature.","salesMarkdown":"## 150 V, 85 A — the conduction-loss ceiling The IRFB4321PBF is an N-channel HEXFET power MOSFET in a TO-220AB through-hole package. At 33 A and 10 V, the maximum Rds(on) is 15 mOhm, and the package dissipates up to 350 W. ## Gate drive and switching budget Gate charge is 110 nC at 10 V, with a maximum gate-source voltage of ±30 V. The 110 nC Qg is moderate for a TO-220 N-channel — it dictates the gate-driver peak current and switching loss at frequencies above 50 kHz. Input capacitance is 4460 pF at 50 V drain-source, which sets the drive impedance and rise-time budget. The threshold voltage is 5 V max at 250 µA drain current, and the recommended drive voltage for minimum Rds(on) is 10 V. A 10 V gate rail is standard for logic-level gate drivers; a 5 V drive will not fully enhance the channel and will increase conduction loss. ## Temperature grade and environment The junction temperature range is -55°C to 175°C. ## Sourcing and compliance It is ROHS3 compliant.","metaTitle":"IRFB4321PBF HEXFET N-Channel MOSFET, 150 V, 85 A, 15 mOhm","metaDescription":"IRFB4321PBF HEXFET N-Channel MOSFET, 150 Vdss, 85 A continuous, 15 mOhm Rds(on) at 33 A, 10 V. Active lifecycle, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"HEXFET®","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":[],"specifications":{"Series":"HEXFET®","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±30V","Technology":"MOSFET (Metal Oxide)","Mounting Type":"Through Hole","Package / Case":"TO-220-3","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"5V @ 250µA","Operating Temperature":"-55°C ~ 175°C (TJ)","Rds On (Max) @ Id, Vgs":"15mOhm @ 33A, 10V","Power Dissipation (Max)":"350W (Tc)","Supplier Device Package":"TO-220AB","Gate Charge (Qg) (Max) @ Vgs":"110 nC @ 10 V","Drain to Source Voltage (Vdss)":"150 V","Input Capacitance (Ciss) (Max) @ Vds":"4460 pF @ 50 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"85A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.2","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.20000","currency":"USD"},{"qty":10,"price":"$2.68400","currency":"USD"},{"qty":100,"price":"$2.17160","currency":"USD"},{"qty":500,"price":"$1.93032","currency":"USD"},{"qty":1000,"price":"$1.65283","currency":"USD"},{"qty":2000,"price":"$1.55632","currency":"USD"},{"qty":5000,"price":"$1.49312","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/f64a2d8a2e7d66378bb6b4994d315172.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the Rds(on) of IRFB4321PBF?","answer":"The maximum Rds(on) is 15 mOhm at 33 A drain current with 10 V gate drive. This is the conduction-loss spec used for thermal design."},{"question":"IRFB4321PBF datasheet specifications?","answer":"Key specifications: N-channel HEXFET, 150 Vdss, 85 A continuous drain, 15 mOhm Rds(on) at 33 A and 10 V, 110 nC gate charge, 4460 pF input capacitance, -55°C to 175°C junction temperature, TO-220-3 package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/IRFB4321PBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/IRFB4321PBF 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}}