Industrial-Grade Isolation MOSFET Power Switch Module (LR7843 Compatible)

Description

Product Overview

The Industrial-Grade Isolation MOSFET Power Switch Module is a high-performance, solid-state switching solution designed for demanding DC power control applications. Built around a high-quality MOSFET (compatible with the renowned LR7843), this module combines exceptional current handling capability with robust opto-isolation to create a safe and reliable interface between your low-voltage control electronics and high-power DC loads .

At its core, this module utilizes an N-Channel logic-level power MOSFET featuring an ultra-low on-resistance (RDS(on)) of just 3.3mΩ . This extremely low resistance ensures minimal power loss and heat generation, even when switching currents up to 15A continuously . The MOSFET itself is capable of handling peak currents of up to 161A, though practical continuous operation requires proper thermal management .

The key differentiator of this module is its built-in opto-isolation circuit, centered around a PC817 optocoupler . This creates a complete electrical barrier between the input signal (your microcontroller) and the high-power load circuit, protecting your sensitive electronics from dangerous voltage spikes, back-EMF from motors, and ground loop interference . If the MOSFET were to fail catastrophically, the isolation helps ensure that your expensive Arduino, Raspberry Pi, or PLC remains unharmed .

This module is the ideal choice for industrial automation, robotics, high-power lighting control, motor speed regulation, and any application requiring reliable, high-speed switching of DC loads up to 28V . Its compatibility with both 3.3V and 5V logic makes it a versatile building block for modern control systems .

Key Features

• High-Performance MOSFET (LR7843 Compatible): Utilizes a powerful N-Channel MOSFET with an exceptionally low on-resistance of just 3.3mΩ . This ensures efficient power delivery with minimal heat generation, even at high currents.

• Industrial-Grade Current Handling: Capable of switching 15A continuously with a 12V load (based on module design and thermal performance) . The MOSFET itself is rated for peak currents up to 161A, providing a massive safety margin for surge loads .

• Robust Opto-Isolation: Features a built-in PC817 optocoupler that provides galvanic isolation between the control signal and the power circuit . This critical feature:

  • Protects microcontrollers from back-EMF and voltage spikes

  • Eliminates ground loop interference

  • Enhances noise immunity in industrial environments

• Wide Logic Voltage Compatibility: Accepts control signals from 2.5V to 20V, making it directly compatible with 3.3V microcontrollers (ESP32, Raspberry Pi Pico), 5V systems (Arduino), and even 12V-24V industrial PLCs without any additional components .

• PWM Compatible for Analog Control: Fully supports high-speed PWM signals, enabling smooth and efficient speed control of DC motors or stepless dimming of high-power LED lighting .

• Active HIGH Logic: Simple and intuitive control—apply a HIGH logic signal (or PWM) to turn the MOSFET ON and connect the load; apply LOW to turn it OFF .

• Visual Status Indicator: An onboard LED provides immediate visual confirmation when the MOSFET is switched on, simplifying troubleshooting and operation monitoring .

• Flexible Connection Options: Features solder pads for both pin headers and screw terminals, allowing you to configure the module for breadboard prototyping or permanent installations .

• Compact & Mountable Design: Small footprint with two 2mm mounting holes for secure integration into enclosures or control panels .

• Parallel Operation Capability: Modules can be connected in parallel to further increase overall power handling capacity for extreme applications .

Technical Specifications