{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"AUIRFZ44Z","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"AUIRFZ44Z","canonicalUrl":"https://icboms.com/infineon/AUIRFZ44Z","factsUrl":"https://icboms.com/api/mcp/products/AUIRFZ44Z","rawCanonicalId":null},"summary":{"shortDescription":"Infineon HEXFET® AUIRFZ44Z, N-Channel MOSFET, 55 V drain-source, 51 A continuous drain current, 13.9 mOhm Rds(on) at 10 V, TO-220 through-hole package, -55 to 175 °C junction temperature.","salesMarkdown":"## Through-hole power switch for 55 V rails The Infineon AUIRFZ44Z is an N-channel enhancement-mode MOSFET from the HEXFET® series, housed in a TO-220 through-hole package. ## Gate drive and switching loss budget The gate threshold is 4 V maximum at 250 µA, but the on-resistance is specified at Vgs = 10 V — a 10 V gate drive is needed to reach the rated 13.9 mOhm. Total gate charge is 43 nC at 10 V, so a driver sourcing 1 A can switch the gate in about 43 ns, not accounting for driver and layout parasitics. Absolute maximum gate-source voltage is ±20 V, so the gate drive must be clamped if the supply rail exceeds 20 V. ## 175 °C junction — thermal headroom for harsh environments The 175 °C ceiling provides derating margin compared to 150 °C-rated devices. Power dissipation is rated at 80 W; the TO-220 package with a proper heatsink can handle the thermal load at full current if the duty cycle and ambient are managed.","metaTitle":"AUIRFZ44Z N-Channel MOSFET, 55V 51A TO-220, 13.9mOhm Rds(on)","metaDescription":"AUIRFZ44Z N-channel HEXFET MOSFET, 55V, 51A, 13.9mOhm Rds(on) at 10V, TO-220 package, 175°C Tj, active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Vgs":"±20 V","series":"HEXFET®","power_w":"80.0","Fet Type":"N-Channel","package_type":"Bulk","mounting_type":"Through Hole","capacitance_uf":"0.0014","product_status":"Active","lifecycle_stage":"eol_hot","supply_voltage_v":"55.0","Vgs(Th) (Max) @ Id":"4 V @ 250µA","switching_current_a":"51.0","Rds On (Max) @ Id, Vgs":"13.9mOhm @ 31 A, 10 V","Operating Temperature High":"-55°C to 175°C(TJ)","Gate Charge (Qg) (Max) @ Vgs":"43 nC @ 10 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.83","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/49bff5c55f5479056fe978d2d3ed7d4b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to AUIRFZ44Z?","answer":"The AUIRFZ44Z is the automotive-qualified variant of the IRFZ44Z. Both share the same TO-220 pinout and similar ratings — the AUIRFZ44Z carries a 175 °C junction temperature rating versus the standard IRFZ44Z's 175 °C as well. For a direct replacement, confirm the gate charge and Rds(on) match your switching frequency and thermal budget."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/AUIRFZ44Z","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/AUIRFZ44Z 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}}