The LR7843 MOSFET is commonly referred to as IRLR7843. It is a high-performance N-Channel HEXFET Power MOSFET, which is developed by International Rectifier. The MOSFET is specially optimized for low voltage, high-current applications. it offering a extremely low RDS(on) at logic level gate voltages, so it is used in modern DC to DC converters and power management circuits.
Overview of LR7843 MOSFET
The LR7843 is designed to operate efficiently with the gate drive of 4.5V. This allows the direct interfacing with microcontrollers and PWM controller ICs. Its fast switching speed, low gate charge and excellent thermal performance is the main advantage, so it is suitable for high frequency applications.
Features
- Logic level N-Channel MOSFET.
- Ultra low on-resistance.
- High continuous drain current.
- Optimized for synchronous buck converters.
LR7843 Pinout
Specifications
- Drain-Source Voltage (VDS): 30 V
- Gate-Source Voltage (VGS): +/-20 V
- Continuous Drain Current (ID @ 25°C): 161 A
- Pulsed Drain Current (IDM): 620 A
- Power Dissipation (PD @ 25°C): 140 W
- Operating Junction Temperature: −55°C to +175°C
- RDS(on) @ VGS = 10V is 2.6 mΩ max of 3.3 mΩ
- RDS(on) @ VGS = 4.5 is 3.2 mΩ and max is 4.0 mΩ
Equivalent SMD MOSFETs for Replacement
- IRL7833
- IRLR8726
- IRLZ44N (through-hole alternative)
- AOI518
Applications
LR7843 used in synchronous buck converters because a low loss switch to convert higher DC voltage into a lower voltage with very high efficiency.
Used in CPU and GPU power supplies because It can handle very high currents at low voltages and reducing the heat and improving its power delivery stability.
In High frequency DC-DC converters used because of its switching speed and it will allow the operation at high frequencies, easily use smaller inductors and can setup compact designs.
In Battery powered systems, The very low on-resistance minimizes power loss, helping extend battery life.
Motor control and load switching, The MOSFET acts as a fast and reliable electronic switch for controlling motors or heavy loads.
In Telecom and industrial power modules, it Provides stable, efficient power handling for continuous and high reliability applications.
