Bidirectional Mosfet Switch Board (3300V)

Our next-generation Bidirectional MOSFET Switch (3300V) is the most advanced high-voltage AC switch in this class, completely redesigned from the ground up for extreme speed, stability, and thermal performance. Built around TO-263-7 MOSFET packages, this revision minimizes gate-loop inductance, integrates a brand-new high-speed gate driver, and introduces a substantially improved cooling solution—enabling reliable operation deep into the multi-MHz range.

• 3300V Bidirectional High-Voltage Operation: Designed for demanding AC applications, this switch uses two high-voltage MOSFETs in a back-to-back (common-source) configuration, allowing safe and efficient bidirectional current blocking at voltages up to 3300V.
   
• Ultra-Fast ~5ns Switching: A completely new gate driver combined with an ultra-low-inductance layout enables switching transitions as fast as 5 ns (MOSFET- and load-dependent), making this one of the fastest bidirectional high-voltage switches available.
   
• Minimized Gate-Loop Inductance: The PCB layout has been fully optimized to reduce gate-loop inductance, resulting in cleaner edges, reduced ringing, and stable operation at very high switching frequencies.
   
• Advanced Thermal Architecture: Heat dissipation has been dramatically improved through a combination of dedicated heatsinks mounted directly on the MOSFETs and large copper areas that are in direct thermal contact with the drain pads. This allows sustained high-speed operation without thermal stress.
   
• Integrated Active Cooling: The board provides 12 V fan output via both an XH2.54 connector and a 2-port screw terminal. A silent maglev fan is included and pre-connected to the XH2.54 port, ensuring efficient, quiet cooling and enabling reliable multi-MHz operation.
   
• High-Frequency AC Capability: While performance depends on MOSFET gate capacitance and load conditions, the board comfortably supports frequencies above 1 MHz and has been tested at 3 MHz and beyond with suitable devices.
   
• Essential for Resonance Circuits: True bidirectional current blocking makes this switch indispensable in resonant AC systems where current alternates direction every half-cycle.
   
• High-Side or Low-Side Switching: The flexible topology allows use in both high-side and low-side switching configurations, depending on system requirements.
   
• 3.3V & 5V Logic Compatible: The input stage supports both 3.3 V and 5 V logic levels, allowing direct connection to microcontrollers for precise, programmable switching control.
   
• Selectable 50-Ohm Input Termination: A switchable 50 ohm impedance-matching resistor is included on the input, which is highly beneficial for maintaining signal integrity during high-frequency operation with standard signal generators and coaxial cables.
   
• Built-In Fuse Protection: An onboard fuse adds an extra layer of safety, protecting the MOSFETs and gate driver circuitry during overcurrent or fault conditions.
   
• BNC Connection for Ease: A dedicated BNC connector provides a clean, reliable interface to function generators and laboratory signal sources.

The Bidirectional MOSFET Switch (3300V) is a powerful platform for advanced AC and resonant circuit experimentation, combining extreme switching speed, high-voltage capability, and robust thermal design. It is ideally suited for researchers and engineers pushing the limits of high-voltage, high-frequency electronics.

Technical Specification:

Datasheets for the selectable MOSFETs can be found here: G2R120MT33J and G2R1000MT33J

This product includes a BNC to hookup wire adapter and a pre-installed silent maglev cooling fan for immediate use.