{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"IRF3709SPBF","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"IRF3709SPBF","canonicalUrl":"https://icboms.com/infineon/IRF3709SPBF","factsUrl":"https://icboms.com/api/mcp/products/IRF3709SPBF","rawCanonicalId":null},"summary":{"shortDescription":"IRF HEXFET IRF3709SPBF, N-Channel SMPS Power MOSFET, 30 V, 90 A, 9mOhm Rds(on) max at 15 A, ±20 Vgs, 41 nC gate charge, Surface Mount, -55°C to 150°C Tj.","salesMarkdown":"## 9 mOhm Rds(on) at 15 A — conduction loss anchor for the SMPS stage The IRF3709SPBF is an N-channel HEXFET power MOSFET from Infineon (formerly International Rectifier), rated 30 V drain-source with a continuous drain current of 90 A. The 3 V maximum gate threshold at 250 µA confirms it is fully enhanced by a standard 5 V gate drive rail. Total gate charge is 41 nC at 5 V, which sets the switching energy per cycle and the gate driver peak current requirement. At a 200 kHz switching frequency, the average gate drive current is roughly 8.2 mA — well within a typical 1 A to 2 A driver's capability, though the peak current during the Miller plateau still needs to be budgeted. ## Junction rating to 150 °C — thermal headroom for enclosed supplies For a 3.1 W device, the junction-to-ambient thermal resistance must be kept below 40 °C/W to stay within the 150 °C ceiling at full dissipation in a 25 °C ambient — this typically requires a copper pour on the drain tab footprint or a small heatsink. The 0.0027 µF (2.7 nF) output capacitance is the energy stored on the die output — it contributes to switching losses during hard-switching transitions and should be factored into the FET's Coss-related loss term in the converter design. The buyer can commit the BOM position for current production runs without obsolescence risk.","metaTitle":"IRF3709SPBF N-Channel HEXFET MOSFET, 30 V, 9 mOhm, Active","metaDescription":"IRF3709SPBF N-channel HEXFET SMPS MOSFET, 30 V, 90 A, 9 mOhm Rds(on) at 15 A. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Vgs":"±20 V","series":"HEXFET®","power_w":"3.1","Fet Type":"N-Channel","package_type":"Bulk","mounting_type":"Surface Mount","capacitance_uf":"0.0027","product_status":"Active","lifecycle_stage":"eol_hot","supply_voltage_v":"30.0","Vgs(Th) (Max) @ Id":"3 V @ 250µA","switching_current_a":"90.0","Rds On (Max) @ Id, Vgs":"9mOhm @ 15 A, 10 V","Operating Temperature High":"-55°C to 150°C(TJ)","Gate Charge (Qg) (Max) @ Vgs":"41 nC @ 5 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.53","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2ee65627d6cd3377714c82d7fb13d391.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the Rds(on) of IRF3709SPBF?","answer":"Maximum Rds(on) is 9 mOhm at 15 A drain current with a 10 V gate-to-source voltage. This is the worst-case conduction loss figure for the SMPS output stage at 25 °C junction — derate upward with temperature per the normalised curve in the datasheet."},{"question":"What is the gate charge of IRF3709SPBF?","answer":"Total gate charge is 41 nC at a 5 V gate drive voltage. This determines the average gate drive current at a given switching frequency — 8.2 mA at 200 kHz — and the peak current needed from the driver during the Miller plateau."},{"question":"What is IRF3709SPBF's listed Vgs rating?","answer":"The maximum gate-to-source voltage is ±20 V. The gate drive rail should be kept within this absolute maximum; a standard 10 V or 12 V gate drive is safe, while 15 V drive rails leave margin below the ±20 V ceiling."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/IRF3709SPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/IRF3709SPBF 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}}