{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"IRF3709PBF","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"IRF3709PBF","canonicalUrl":"https://icboms.com/infineon/IRF3709PBF","factsUrl":"https://icboms.com/api/mcp/products/IRF3709PBF","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies HEXFET® N-Channel MOSFET, IRF3709PBF, 30 V, 90 A switching current, 9 mOhm Rds(on) at 10 V, TO-220 through-hole, bulk.","salesMarkdown":"## Package and board-fit — TO-220 through-hole The IRF3709PBF comes in a through-hole TO-220 package, shipped in bulk tubes. That means the leads are thick enough to take a soldering iron or a socket without worrying about lifted pads — a rework-friendly part that survives a hot-air desoldering cycle as long as you keep the junction below 150°C (the max operating junction temp per the spec). The three-lead layout is standard TO-220: gate, drain (tab), source. Pin 1 is the gate — orient it by the tab side before you solder. The tab is the drain, so if you're bolting it to a heatsink, that sink is at drain potential; insulate it or keep the chassis isolated. ## On-resistance and gate drive — what the numbers mean for your circuit Rds(on) is 9 mOhm max at Vgs=10 V, Id=15 A. That's the on-resistance you design the conduction loss around at full gate drive. At 15 A, the dissipation is I²R = 2.0 W — well within the 3.1 W total power rating, but only if the junction stays under 150°C. The 9 mOhm figure is at 25°C junction; expect it to roughly double at 125°C, so budget for the hot resistance in your thermal loop. Gate threshold is 3 V max at 250 µA drain current. For full conduction, drive the gate to 10 V. The ±20 V Vgs rating gives headroom against ringing on long gate traces — you won't blow the oxide with a 12 V gate drive rail. ## Switching performance — 90 A peak, 41 nC gate charge The 90 A switching current is a pulse rating, not continuous DC. Use it for motor inrush, capacitor charging, or load-switch transients. The continuous drain current is derated by package and temperature — the TO-220 body limits steady-state current to about 30-40 A with adequate heatsinking, but the silicon can handle the peak. Gate charge Qg is 41 nC at Vgs=5 V. That's moderate — a typical gate driver with 1 A peak output can switch it in about 40 ns. For a 100 kHz SMPS, the gate drive power is Qg × Vgs × f = 41 nC × 5 V × 100 kHz = 20.5 mW, negligible. The 0.0027 µF input capacitance (Ciss) is consistent with a 90 A-class die — your driver sees a capacitive load of about 2.7 nF at the gate.","metaTitle":"IRF3709PBF Infineon N-Channel MOSFET, 90 A, 9 mOhm, TO-220","metaDescription":"IRF3709PBF N-channel HEXFET MOSFET, 30 V, 90 A switching, 9 mOhm Rds(on) at 10 V. Active production. Quoted to order against RFQ.","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":"Through Hole","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":"$0.57","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2ee65627d6cd3377714c82d7fb13d391.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/IRF3709PBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/IRF3709PBF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}