Bidirectional Mosfet Switch Board (TO-247-4)

Introducing our next-generation Bidirectional MOSFET Switch, completely redesigned from the ground up for ultra-fast, high-frequency AC circuit experimentation. This advanced board minimizes gate-loop inductance, features a brand-new high-speed gate driver, and incorporates two TO-247-4 MOSFET sockets for effortless device swapping. Here's why this upgraded switch is an essential tool for your most demanding applications:

• Bidirectional Current Blocking: Featuring two MOSFETs in a back-to-back configuration, the switch blocks current flow in both directions when turned off. This eliminates the inherent body diode limitation of single MOSFETs, making it ideal for AC systems where current alternates direction.
   
• Ultra-Fast Switching: The redesigned gate driver enables switching transitions just above 10 ns (MOSFET- and load-dependent). This is perfect for dynamically altering tank circuits or rapidly connecting/disconnecting capacitors, inductors, and other AC components.
   
• Optimized Low-Inductance Layout: By minimizing gate-loop inductance throughout the board, switching becomes cleaner, faster, and more stable at high frequencies.
   
• Two TO-247-4 Sockets for Zero-Hassle MOSFET Replacement: Swap MOSFETs instantly—no screws or soldering required. Simply slide devices in and out of the precision sockets, making experimentation faster and easier than ever.
   
• Ideal for Resonance Circuits: Bidirectional current blocking allows seamless integration into resonant AC systems, where alternating current flow is required for stable operation.
   
• Robust Isolated Driver System: Like our standard switch board, this model includes an isolated gate driver with an independent onboard DC-DC supply, allowing the MOSFET pair to operate at potentials up to 2300 V above (or below) the control electronics.
   
• High-Side or Low-Side Switching: Flexible configuration makes the switch suitable for both high-side and low-side integration in advanced AC or pulsed-power systems.
   
• 3.3V & 5V Logic Compatible: The input stage supports both 3.3V and 5V logic, allowing direct connection to microcontrollers for programmable switching control.
   
• Selectable 50-Ohm Input Termination: Includes a switchable 50 ohm termination resistor for proper impedance matching to standard 50 ohm signal generators and coaxial cabling, recommended for clean high-frequency operation.
   
• Built-In Fuse Protection: An onboard fuse provides additional safety by protecting the driver and MOSFETs during unexpected overcurrent or overvoltage events.
   
• Fan Support for High-Speed Operation: Equipped with two XH2.54 12V fan ports and a 2-port screw terminal, the board can drive almost any fan setup for MOSFET cooling. For extended operation above 1 MHz, we recommend directing airflow onto the board to avoid thermal shutdown.
   
• Maximum Switching Speed: Capable of frequencies well above 1 MHz. With suitable MOSFETs, the board has been tested at 3 MHz and beyond, depending on device gate capacitance and load conditions.
   
• User-Friendly High-Current Terminals: Heavy-duty screw terminals rated for AWG10 ensure secure, low-loss connections for high-current AC switching.
   
• BNC Connection for Ease: A dedicated BNC input offers reliable, low-noise connection to signal generators and laboratory equipment.
   
• Input Signal Compatibility: Supports 0–5V and 0–3.3V square-wave logic signals (into 50 ohm when selected). Negative voltages must be avoided to protect the gate driver.

Whether you're modifying high-frequency tank circuits or performing advanced AC switching experiments, this next-generation bidirectional MOSFET switch delivers unmatched performance, reliability, and precision.

TO-247-4 / TO-247-4L compatibility:
The terms TO-247-4 and TO-247-4L are commonly used to describe the same four-pin TO-247 power package featuring a separate Kelvin source (sense) lead. In practice, these designations are used interchangeably across manufacturers and datasheets. This board is fully compatible with both TO-247-4 and TO-247-4L MOSFETs and IGBTs.

The dedicated Kelvin source/emitter lead allows the gate driver to reference the device at the true source/emitter potential, independent of the high-current power path. By separating the gate-drive loop from the load current loop, parasitic inductance and voltage bounce are significantly reduced. This results in cleaner gate signals, faster and more predictable switching transitions, reduced ringing, and lower switching losses—especially important at high switching speeds, high di/dt, and high power levels.

Technical Specification:

Datasheets for selectable MOSFETs can be found here: GP3T080A120H — MSC080SMB120B4N — IMYH200R050M1H — MSC400SMA330B4N

This product includes two heat sinks for TO-247 MOSFETs and a BNC-to-hookup-wire adapter for easy connection to a Microcontroller Unit (MCU).