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The BUK9Y4R4-40E,115 is a logic level N-channel MOSFET utilizing TrenchMOS technology in an LFPAK56 (Power SO8) package. It features a drain-source voltage of 40 V and a continuous drain current of 100 A at 25 °C mounting base temperature. The device exhibits a maximum on-state resistance of 4.4 mΩ at VGS = 5 V and ID = 25 A. Total power dissipation reaches 147 W under specified conditions. The component supports junction temperatures up to 175 °C and includes repetitive avalanche rating capabilities.
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Select this component when low conduction losses are required in automotive or industrial power switching designs. The logic level gate drive allows direct interfacing with standard microcontrollers without additional level shifting circuitry. Ensure thermal management strategies account for the 175 °C junction limit and the thermal resistance from junction to mounting base.
This part belongs to Nexperia's TrenchMOS family of N-channel enhancement mode field-effect transistors. It is housed in the SOT669 (LFPAK56) surface-mount package, which provides a robust mechanical structure and efficient heat dissipation through a large mounting base connected to the drain terminal.
Consult official Nexperia documentation for verified cross-reference part numbers. Do not substitute based solely on pinout compatibility; verify electrical parameters including RDS(on), VGS(th), and package dimensions against the original specification sheet.
The DC gate-source voltage rating is ±10 V, while the pulsed rating extends to ±15 V.
The device maintains a true logic level gate with a VGS(th) rating of greater than 0.5 V even at a junction temperature of 175 °C.