{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"IRF40B207","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"IRF40B207","canonicalUrl":"https://icboms.com/infineon/IRF40B207","factsUrl":"https://icboms.com/api/mcp/products/IRF40B207","rawCanonicalId":null},"summary":{"shortDescription":"Infineon IRF40B207, HEXFET StrongIRFET series, N-channel MOSFET, 40 V Vdss, 95 A Id, 4.5 mOhm Rds(on) at 10 V, 68 nC Qg, TO-220AB, -55 to 175 °C.","salesMarkdown":"## Gate charge and switching speed — what 68 nC buys Total gate charge is 68 nC at 10 V. For a 100 kHz switching regulator, that translates to roughly 6.8 mA average gate-drive current — a standard 1 A gate driver handles it with margin. The input capacitance is 2110 pF at 25 V Vds, which means the driver sees a moderate capacitive load; rise and fall times stay in the tens of nanoseconds with a proper driver, not a microcontroller pin. The drive voltage range is specified from 6 V (minimum for rated Rds(on)) to 10 V (for the full 4.5 mOhm). A 12 V gate drive is fine within the ±20 V Vgs max, but the 10 V figure is the one to design to for the datasheet Rds(on) number. ## 175 °C junction — where this part lives That 175 °C ceiling is a step above the common 150 °C limit — it suits under-hood automotive, engine-bay, or industrial enclosures where ambient air hits 85 °C and the heatsink sees 100 °C. The 83 W power dissipation at case temperature is the thermal budget; at 50 A continuous with 4.5 mOhm, conduction loss is about 11.25 W, leaving headroom for switching losses before the junction reaches 175 °C. This is a low-voltage, high-current switch. The 40 V Vdss ceiling means it belongs in 12 V, 24 V, or 36 V rails — not a 48 V telecom bus (which needs 60 V or 80 V rated parts). Typical applications include brushed and brushless DC motor drivers, secondary-side synchronous rectification in 12 V output power supplies, battery-management load switches, and low-voltage inverter stages. The 95 A continuous rating at 25 °C case assumes the case is held at 25 °C — real-world derating applies; at 100 °C case, the current capability drops per the datasheet curve.","metaTitle":"IRF40B207 MOSFET N-CH 40V 95A TO-220AB, 4.5 mOhm Rds(on)","metaDescription":"IRF40B207 N-channel HEXFET, StrongIRFET MOSFET. 40 V Vdss, 95 A Id, 4.5 mOhm Rds(on) at 10 V. Active production, TO-220AB. Quoted to order.","metaKeywords":null},"attributes":{"series":"HEXFET®, StrongIRFET™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":[],"specifications":{"Series":"HEXFET®, StrongIRFET™","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±20V","Technology":"MOSFET (Metal Oxide)","Mounting Type":"Through Hole","Package / Case":"TO-220-3","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"3.9V @ 50µA","Operating Temperature":"-55°C ~ 175°C (TJ)","Rds On (Max) @ Id, Vgs":"4.5mOhm @ 57A, 10V","Power Dissipation (Max)":"83W (Tc)","Supplier Device Package":"TO-220AB","Gate Charge (Qg) (Max) @ Vgs":"68 nC @ 10 V","Drain to Source Voltage (Vdss)":"40 V","Input Capacitance (Ciss) (Max) @ Vds":"2110 pF @ 25 V","Drive Voltage (Max Rds On, Min Rds On)":"6V, 10V","Current - Continuous Drain (Id) @ 25°C":"95A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.27","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.27000","currency":"USD"},{"qty":10,"price":"$1.04300","currency":"USD"},{"qty":100,"price":"$0.81110","currency":"USD"},{"qty":500,"price":"$0.68748","currency":"USD"},{"qty":1000,"price":"$0.56002","currency":"USD"},{"qty":2000,"price":"$0.52720","currency":"USD"},{"qty":5000,"price":"$0.50209","currency":"USD"},{"qty":10000,"price":"$0.47892","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/e63a28597c70a3ba1c0dc696207485a6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the exact on-resistance (Rds(on)) of the IRF40B207 at 10V gate drive?","answer":"The maximum Rds(on) is 4.5 mOhm at 57 A drain current and 10 V gate-to-source voltage. This is the figure to use for worst-case conduction-loss calculations at 25 °C junction; at elevated temperature the on-resistance increases per the normalised curve in the datasheet."},{"question":"Can IRF40B207 be used as a replacement for the IRFZ44N in a 12V motor driver?","answer":"The IRF40B207 has a lower Rds(on) (4.5 mOhm vs the IRFZ44N's typical 17.5 mOhm) and a higher 95 A continuous rating, so it will run cooler at the same load current. The 40 V Vdss matches the IRFZ44N's 55 V rating for a 12 V rail. The TO-220AB package is pin-compatible. It is a viable upgrade, but confirm the gate-drive voltage — the IRF40B207 is specified at 10 V for full Rds(on), while the IRFZ44N is often driven at 10 V as well."},{"question":"What is the maximum drain current (Id) of IRF40B207 at 25°C case temperature?","answer":"The continuous drain current is rated at 95 A when the case temperature is held at 25 °C. This is a package-limited rating at the TO-220AB's thermal capability; at elevated case temperatures the current must be derated."},{"question":"Does the IRF40B207 require a heatsink for 50A continuous operation?","answer":"At 50 A with 4.5 mOhm Rds(on), conduction loss is about 11.25 W. The maximum power dissipation is 83 W at case temperature, so 11.25 W is within the device's capability — but without a heatsink the junction will rise well above 25 °C. A modest heatsink (thermal resistance around 5-10 °C/W) is recommended to keep the junction below 125 °C in a 25 °C ambient."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/IRF40B207","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/IRF40B207 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}}