Infineon IRFRFR7546TRPBF N-Channel MOSFET: Datasheet, Application Circuit, and Replacement Guide
The Infineon IRFRFR7546TRPBF is a powerful N-Channel MOSFET leveraging advanced OptiMOS™ technology, designed to deliver exceptional efficiency and reliability in a wide range of power conversion applications. This surface-mount device is a popular choice for designers seeking a robust switching solution with low losses.
Datasheet Overview and Key Specifications
The datasheet for the IRFRFR7546TRPBF reveals its core electrical characteristics, which are critical for circuit design. Key specifications include:
Drain-Source Voltage (Vds): 150V
Continuous Drain Current (Id): 13A at 25°C
On-Resistance (Rds(on)): A remarkably low 16.5 mΩ (max) at 10V gate drive, which is pivotal for minimizing conduction losses and improving overall system efficiency.
Gate Threshold Voltage (Vgs(th)): Typically 2.8V, making it compatible with both 5V and 3.3V logic-level drivers, though a higher gate drive (e.g., 10V) is recommended to achieve the lowest Rds(on).
Package: The device is housed in a D²PAK (TO-263) package, offering an excellent balance between power handling capability and board space.
Typical Application Circuit
A common application for this MOSFET is in a synchronous buck converter, a core topology for DC-DC voltage regulation in systems like server power supplies and industrial motor drives. In this circuit, the IRFRFR7546TRPBF is often used as the low-side (synchronous) switch.
The high-side switch (control FET) is turned on and off to control the energy transfer from input to output. The IRFRFR7546TRPBF, as the low-side FET, conducts to provide a freewheeling path for the inductor current when the high-side switch is off. Its low Rds(on) is critical here to minimize the voltage drop and power loss during this conduction period, directly boosting the converter's efficiency. A dedicated MOSFET driver IC is essential to provide the sharp voltage transitions needed to quickly turn the device on and off, minimizing switching losses.
Replacement and Cross-Reference Guide
When a direct replacement is needed, it is crucial to match not only the basic voltage and current ratings but also the dynamic characteristics. Suitable replacements for the IRFRFR7546TRPBF should be evaluated based on:
Voltage and Current Rating: Look for Vds ≥ 150V and Id ≥ 13A.
On-Resistance (Rds(on)): Ensure the value is similarly low (e.g., < 20 mΩ) at the same gate-source voltage.
Gate Charge (Qg): A similar or lower total gate charge is desirable for comparable switching performance.
Package: Must be a pin-to-pin compatible package (D²PAK/TO-263).
Potential alternative parts from other manufacturers include Vishay's SiR854DP-T1-GE3 or ON Semiconductor's FDPF18N20T. However, always consult the latest datasheets to verify performance in the specific application.
ICGOOODFIND Summary
The Infineon IRFRFR7546TRPBF stands out as a highly efficient N-Channel MOSFET, prized for its very low on-resistance and strong performance in switching power supplies and motor control applications. Its D²PAK package offers superior thermal characteristics, making it a reliable workhorse for power electronics designers who prioritize efficiency and thermal management.
Keywords: OptiMOS™, Low On-Resistance, N-Channel MOSFET, Synchronous Buck Converter, D²PAK Package.
