{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"AUIRFU4104","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"AUIRFU4104","canonicalUrl":"https://icboms.com/infineon/AUIRFU4104","factsUrl":"https://icboms.com/api/mcp/products/AUIRFU4104","rawCanonicalId":null},"summary":{"shortDescription":"Infineon AUIRFU4104, Automotive AEC-Q101 HEXFET, N-Channel MOSFET, 40 V, 42 A, 5.5 mOhm Rds(on) @ 10 V, 89 nC gate charge, TO-251-3-21 through-hole, -55°C to 175°C junction.","salesMarkdown":"The Infineon AUIRFU4104 is a 40 V, 42 A N-channel HEXFET in the TO-251-3-21 (IPAK) through-hole package, qualified to AEC-Q101 for automotive and harsh-environment power switching. Its 5.5 mOhm Rds(on) at Vgs=10 V and 42 A sets the conduction loss floor — at full rated current that's under 10 W dissipation in the channel alone, but the 140 W package power limit means the junction-to-case thermal path and copper pad area on the PCB drive the real current ceiling. ## Gate drive: not a logic-level part The 4 V gate threshold at 250 µA and 89 nC total gate charge at Vgs=10 V tell you this is a standard-threshold MOSFET — it needs a gate drive swinging to 10 V to hit the rated 5.5 mOhm Rds(on). A 5 V logic-level gate signal leaves it in the linear region, so budget a proper gate driver or a driver with a bootstrap rail above 8 V. ## Temperature range and qualification Junction temperature spans -55°C to 175°C, wider than the typical 150°C max — this part lives in under-hood engine compartments, transmission controllers, or any high-ambient automotive module where the silicon sees sustained heat soak. The AEC-Q101 stamp means it's passed the automotive qualification flow: HTRB, H3TRB, and temperature cycling. The TO-251 through-hole package is a mature, widely sourced form factor; supply is steady through the standard Infineon distribution channel.","metaTitle":"AUIRFU4104 MOSFET N-CH 40V 42A, TO-251, AEC-Q101","metaDescription":"Infineon AUIRFU4104 N-channel HEXFET, 40V, 42A, 5.5 mOhm Rds(on). AEC-Q101 qualified, -55°C to 175°C junction.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Vgs":"±20 V","series":"Automotive, AEC-Q101, HEXFET®","power_w":"140.0","Fet Type":"N-Channel","package_type":"Bulk","mounting_type":"Through Hole","capacitance_uf":"0.0029","product_status":"Active","lifecycle_stage":"eol_hot","supply_voltage_v":"40.0","Vgs(Th) (Max) @ Id":"4 V @ 250µA","switching_current_a":"42.0","Rds On (Max) @ Id, Vgs":"5.5mOhm @ 42 A, 10 V","Operating Temperature High":"-55°C to 175°C(TJ)","Gate Charge (Qg) (Max) @ Vgs":"89 nC @ 10 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.77","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/6e213f2dff82cc297e3bf81c23a6e01f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is AUIRFU4104 a logic-level MOSFET?","answer":"No. The gate threshold is 4 V max at 250 µA, and the rated Rds(on) is specified at Vgs=10 V. A 5 V gate drive will not turn it on hard enough for low conduction loss."},{"question":"What is the Rds(on) of AUIRFU4104?","answer":"5.5 mOhm maximum at Vgs=10 V and Id=42 A, measured at 25°C junction."},{"question":"Is AUIRFU4104 RoHS compliant?","answer":"The part is listed as RoHS compliant per standard Infineon automotive MOSFET compliance. No conflict-of-interest statement; confirm with the specific date code lot upon ordering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/AUIRFU4104","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/AUIRFU4104 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}}