LR7843 MOSFET Control Module

LR7843 MOSFET Control Module is a robust and efficient solution for driving high-current DC loads with a low-voltage control signal. This module leverages the power of the LR7843 MOSFET, which is specifically designed for switching applications where low gate voltage is required. Engineers and makers commonly use this module to control devices like DC motors, high-power LED strips, and solenoid valves directly from microcontrollers like Arduino, Raspberry Pi, or ESP32. It effectively acts as a solid-state switch, handling a significant amount of current while minimizing power loss and heat generation.

Key Features:

• Logic-Level Triggering: The module’s MOSFET fully switches on with a low voltage signal (as low as 2.5V), making it directly compatible with 3.3V and 5V microcontrollers.
• High Current Handling: Capable of switching large DC loads, far exceeding what a microcontroller’s I/O pin can provide.
• Low On-Resistance (Rds(on)): The LR7843’s low resistance when fully on reduces heat dissipation and improves overall efficiency.
• PWM Compatibility: Supports Pulse Width Modulation (PWM) signals, allowing you to precisely control the speed of motors or the brightness of lights.
• Simple Breakout Board: The module provides convenient screw terminals for easy and secure connections to the load and power source.

Technical Specifications:

• MOSFET Model: LR7843
• Control Voltage: 3.3 V to 20 V (typical 5 V)
• Load Voltage (Vds): Up to 30 V
• Continuous Load Current (Id): Up to 161 A (with proper heat sink)
• Static Drain-Source On-Resistance: 3.3 mΩ @ Vgs=10V
• Operating Temperature: -55 °C to +175 °C

Mechanical Specifications:

• Module Type: Breakout PCB with soldered LR7843 MOSFET, resistor, and screw terminals.
• Connectors: 3-pin control header, 2-pin screw terminal for load.
• Assembly: Designed for easy integration with breadboards or permanent mounting.

Dimensions:

• Board Length: ~33 mm
• Board Width: ~25 mm
• Board Thickness: ~1.6 mm

Pinout and Wiring:

• IN (Gate): The control signal pin from your microcontroller (e.g., PWM pin on Arduino).
• GND (Source): Common ground connection for the control signal and the load’s power source.
• VIN+ (Drain): Connect to the positive terminal of your high-power load (e.g., motor).
• VIN- (Source): Connect to the ground terminal of your high-power load. This is the same as the control GND.
• Wiring Note: Connect your microcontroller’s GND to the module’s GND. Connect the microcontroller’s PWM output to the IN pin. Connect your load between the VIN+ and VIN- terminals. The VIN+ terminal also connects to your load’s positive power source.

Datasheet Reference:

• Download the official Infineon LR7843 datasheet for a full reference on its electrical characteristics, thermal information, and performance graphs.

Applications:

• Motor Control: Regulate the speed and direction of DC motors.
• High-Power LED Dimming: Control the brightness of LED strips, high-power LEDs, and theatrical lighting.
• Solenoid and Relay Control: Switch on/off high-current solenoids and latching relays.
• Heater and Pump Control: Drive high-current resistive loads like heating elements or pumps.

Equivalent Models:

• IRF520: A lower-power alternative with similar logic-level control.
• IRLZ44N: Another popular logic-level MOSFET with a slightly different current rating and on-resistance.

Package Includes:

• 1 x LR7843 MOSFET Control Module