FDD8447L N-Channel 40V 50A Power MOSFET TO-252

FDD8447L N-Channel 40V 50A Power MOSFET TO-252 is a robust, high-performance power MOSFET engineered for critical switching applications where efficiency and thermal management are paramount. This N-Channel MOSFET features advanced trench technology, achieving an extremely low on-resistance (R_DS(on)) even with a low gate drive voltage (V_GS). Therefore, the FDD8447L minimizes conduction losses, boosting the overall efficiency of your power conversion or motor control system. Furthermore, its high current handling capability (50A continuous drain current) combined with the thermally efficient D-PAK (TO-252) package makes it an excellent choice for demanding high-frequency switching tasks in compact electronic assemblies. Integrate this component to manage high currents reliably across diverse voltage regulation and driving circuits.

Key Features:

• Low On-Resistance (R_DS(on)): Utilizes proprietary PowerTrench® technology to achieve an R_DS(on) of just 8.8 mΩ at V_GS = 4.5 V, which minimizes power dissipation and heat generation.
• Logic Level Gate Drive: Specified for a V_GS as low as 4.5 V, allowing direct interfacing with common 5V and 3.3V microcontrollers without requiring dedicated high-side driver circuitry.
• High Current Handling: Capable of managing a continuous drain current (I_D) of 50 A (at T_C = 25°C), suitable for high-power switching applications.
• Fast Switching Speed: Optimized gate charge characteristics (Q_g) facilitate rapid switching transitions, which improves efficiency in high-frequency DC-DC converters.
• D-PAK (TO-252) Package: The surface-mount D-PAK provides excellent thermal dissipation, enabling the MOSFET to handle higher power levels within a small footprint.

Technical Specifications:

• Drain-Source Voltage (V_DSS): 40 V
• Continuous Drain Current (I_D): 50 A (at T_C = 25°C)
• Gate-Source Voltage (V_GS): ±20 V maximum
• Low R_DS(on) (at V_GS = 10V): Maximum 6.4 mΩ
• Low R_DS(on) (at V_GS = 4.5V): Maximum 8.8 mΩ
• Total Gate Charge (Q_g): Typically 22 nC
• Operating Temperature Range (T_J): −55°C to +175°C

Mechanical Specifications:

• Package Type: D-PAK (TO-252)
• Mounting: Surface-Mount Device (SMD)
• Die Material: Silicon (PowerTrench® Technology)
• Thermal Resistance (R_ΘJC): Junction-to-Case typically 1.5 °C/W (Excellent thermal transfer capability).

Dimensions:

• Body Length (Overall): ≈ 6.6 mm
• Body Width: ≈ 6.2 mm
• Lead Count: 3 Pins + Tab
• Height (Seated): ≈ 2.4 mm
• Lead Pitch: 2.286 mm (0.09 inch)

Pinout and Wiring:

• Pin 1 (Gate): Connect the control signal (V_GS) from the microcontroller or driver IC. This pin controls the switching action.
• Pin 2 (Drain): Connect to the positive side of the load or the switched voltage line. The large metal tab is also connected internally to the Drain.
• Pin 3 (Source): Connect to the system ground (GND) or the return path for the load current.
• Note: Consequently, always solder the large metal Drain tab directly to a wide PCB copper area to maximize heat dissipation and achieve the rated current.

Datasheet Reference:

• Download ON Semiconductor FDD8447L Datasheet

Commonly Used in:

• Synchronous Rectification: Employed in power supplies and converters to minimize energy loss in the output stage.
• Battery Management Systems (BMS): Used for charge/discharge control and cell protection circuitry in high-capacity lithium-ion battery packs.
• Motor Controllers: Integrated into H-bridge or three-phase bridge circuits for driving brushed and brushless DC motors.

Applications:

• High-Efficiency DC-DC Converters: Performs the high-speed switching necessary for efficient buck, boost, and isolated converter topologies.
• Load Switching: Functions as a solid-state relay to rapidly and reliably switch high-current DC loads in automotive and industrial settings.
• Power OR-ing: Used to manage redundant power supplies, preventing reverse current flow and ensuring seamless power source transitions.

Equivalent Models:

• IRLZ44N (Infineon): A popular logic-level N-Channel MOSFET with similar current ratings, however, it is often in a TO-220 through-hole package.
• AOD4184 (Alpha & Omega): A functionally comparable 40V N-Channel MOSFET in a D-PAK package, commonly used as a direct substitute.
• Si4466DDY (Vishay): Offers a similar low for 40V switching but in a smaller power SO-8 package, prioritizing space over absolute thermal mass.

Package Includes:

• 1 x FDD8447L N-Channel 40V 50A Power MOSFET (TO-252)