Infineon IRLR8726TRPBF N-Channel Power MOSFET: Datasheet, Application Circuit, and Replacement Guide
The Infineon IRLR8726TRPBF is a highly efficient N-Channel Power MOSFET that leverages advanced HEXFET technology to deliver exceptional performance in a compact D-Pak (TO-252) package. Designed for low voltage, high-speed switching applications, this MOSFET is a popular choice for power management solutions across consumer electronics, industrial systems, and automotive applications.
Key Datasheet Specifications and Features
A deep dive into the IRLR8726TRPBF datasheet reveals its core electrical characteristics, which are critical for design engineers:
Drain-Source Voltage (Vds): 30 V. This makes it suitable for a wide range of low-voltage circuits, such as those powered by 12V or 24V rails.
Continuous Drain Current (Id): Up to 57 A at 25°C case temperature. This high current handling capability is a standout feature for its package size.
Low On-Resistance (Rds(on)): A remarkably low 4.5 mΩ at 10 V gate drive (Vgs). This minimized resistance is crucial for reducing conduction losses and improving overall system efficiency, leading to less heat generation.
Gate Threshold Voltage (Vgs(th)): Typically 2.35 V, classifying it as a logic-level MOSFET. It can be effectively driven by 3.3V or 5V microcontroller outputs without needing a separate gate driver IC in many cases.
Fast Switching Speed: Optimized for high-frequency operation, which is essential for applications like switch-mode power supplies (SMPS) and motor control.
Typical Application Circuit: A DC Motor Driver
One of the most common uses for the IRLR8726TRPBF is in motor control circuits. The simple circuit below illustrates its role in driving a DC motor.
```
[Microcontroller GPIO] ---- [Resistor (e.g., 100Ω)] ----> Gate (G)
|
[Zener Diode (e.g., 12V)] (Cathode to Gate, Anode to Source)
Source (S) ----> Ground
Drain (D) ----> [DC Motor] ----> [Power Supply (e.g., 12V)]
```
Circuit Operation:
1. When the microcontroller GPIO pin outputs a HIGH (3.3V or 5V) signal, the MOSFET's gate is charged through the small gate resistor.
2. The device switches on almost fully (thanks to its logic-level gate), creating a low-resistance path between its Drain and Source.
3. Current flows from the power supply, through the motor, through the MOSFET to ground, causing the motor to spin.
4. The gate resistor helps prevent ringing and oscillations. The Zener diode protects the sensitive gate from voltage spikes that might exceed its maximum Vgs rating (±20V).
Replacement and Cross-Reference Guide
When the IRLR8726TRPBF is unavailable, selecting a suitable replacement requires careful comparison of key parameters. Do not substitute based solely on package and voltage. Essential characteristics to match include:
Vds and Continuous Current (Id) rating.
Rds(on) at your intended gate drive voltage (e.g., 4.5V or 10V).
Gate Threshold Voltage (Vgs(th)) to ensure compatibility with your driver circuit.
Package Type (e.g., D-Pak/TO-252) for PCB footprint compatibility.
Potential replacement MOSFETs could include:
Infineon IRF7413TRPBF: A close alternative with similar specs in the same package.
Vishay SiR876DP-T1-GE3: Offers comparable performance with low Rds(on).
ON Semiconductor NVTFS5C404NLWFTAG: Another robust logic-level MOSFET option.
Always consult and compare the latest datasheets from the manufacturer before finalizing a replacement.
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Keywords:
1. Power MOSFET
2. Logic-Level
3. Low On-Resistance (Rds(on))
4. Motor Driver Circuit
5. Cross-Reference
