Eight MOSFETS 8-Layer Stackable HAT for Raspberry Pi

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Eight MOSFETS 8-Layer Stackable HAT for Raspberry Pi

Regular price $45.00


  • Eight MOSFETS 8-Layer Stackable HAT for Raspberry Pi
  • Status LEDs on each output
  • Pluggable Connectors 26-16 AWG wires
  • Four High Current Loads, 8A/24VDC
  • Four High Voltage Loads, 2A/240VDC
  • RS485 with TVS protection and MODBUS protocol
  • Reverse polarity power supply protection
  • General purpose pushbutton
  • All mounting hardware included: brass stand-offs, screws and nuts
  • Software self-test
  • Uses only I2C port (address 0x20..0x27 or 0x38..0x3f ), all GPIO pins available
  • Eight MOSFETS Raspberry Pi
  • Command Line 
  • Python Drivers
  • Node Red Nodes
  • OpenPLC module


8-MOSFETS: Eight Solid State drivers for high current/high voltage DC loads
The 8-MOSFETS card is a stackable expansion card for Raspberry Pi. It has four high current channels which can drive 8A/24V loads and four high voltage channels which can drive loads of 2A/240V. Stackable to 8 layers, the card can provide up to 64 solid state outputs to each Raspberry Pi.
Pluggable connectors make the 8-MOSFETS card easy to use when multiple cards are stacked up. Status LEDs show when MOSFETs are on or off. 
The card is compatible with all Raspberry Pi versions from Zero to 5. All stacked cards share the I2C bus using only two of the Raspberry Pi’s GPIO pins to manage all eight cards.  This feature leaves the remaining 24 GPIOs available for the user. 
The 8-MOSFETS card needs 5V to operate and can be powered from Raspberry Pi or from it's own pluggable connector.  The card draws about 10mA. If power is applied to the card, no other power supply is needed for the Raspberry Pi. 
Up to eight 8-MOSFETS cards can be stacked on your Raspberry Pi. Each card is identified by jumpers you install to indicate the level in the stack. Cards can be installed in any order. The three position jumper on the upper right corner of the card selects the stack level.
For your convenience, two jumpers are provided with each card.
The board is protected to accidental reverse power supply with a 5.8A, 39 mOhm MOSFET which breaks the ground line if reverse power is applied. 
Shutting down the Raspberry Pi by turning off the power can result in SD Card failure. To prevent this, a shutdown command needs to be used before power cut-off. But this requires a monitor, keyboard and mouse connected to the Pi. 
A momentary on push button installed at the edge of the board provides a convenient way to shut down the Raspberry Pi. The button is routed to pin 37 (GPIO 26). You need to write a script which monitors this pin, and if pressed for more than a desired time, issues the shut-down command.
  • Power supply: Pluggable connector 
  • Power consumption: 10mA
  • On board resettable fuse: 3A
  •  MOSFETS 1-4: 125V, 7.5 mOhm
  • MOSFETS 5-8:  250V, 280 mOhm
  • Connector ratings: 250V/8A
  • MOSFETS gate voltage: 12V




You can write your own application using the Command Line or Python Libraries provided. No programming is required if you use the Node-Red nodes provided. You can drag-and-drop the functional blocks to design your application. Examples are provided at GitHub.
The 8-MOSFETS card can be tested before installation by running a simple command from the command line. The card will cycle each MOSFET on and off at 0.5 seconds interval. The lighting of the LEDs will assure that all MOSFETS are functioning. Optional loads on each channel can extend the user's confidence in the hardware.
The 8-MOSFETS card can be installed parallel on a DIN-Rail using the DIN-Rail Kit Type 1, or perpendicular using the DIN-Rail Kit Type 2.
The Smart Fan provides a stackable cooling solution for Raspberry Pi. Its on-board processor powers the fan just enough to maintain the preset temperature of the Pi. If the 8-MOSFETS card is used to drive multiple high current loads, a secondary Smart Fan can be installed on top of the card to provide adequate cooling.


When you purchase the 8-MOSFETS Card you will receive the following items:
1. 8-MOSFETS Stackable HAT for Raspberry Pi
  • Four M2.5x18mm male-female brass standoffs
  • Four M2.5x5mm brass screws
  • Four M2.5 brass nuts
3. Two Stack Level Jumpers
4. Eight 3-pin male connector plugs for MOSFETS and two 2-pin connector plugs for RS485 and power.


  1. Plug your 8-MOSFETS card on top of your Raspberry Pi and power up the system using only one 5V/3A power supply.
  2. Enable I2C communication on Raspberry Pi using raspi-config.
  3. Install the 8-MOSFETS software from github.com:
  4. ~$ git clone https://github.com/SequentMicrosystems/8mosind-rpi.git
  5. ~$ cd /home/pi/8mosind-rpi
  6. ~/8mosind-rpi$ sudo make install
  7. ~/8mosind-rpi$ 8mosind -h
The program will respond with a list of available commands.
Connect your load between pin 2 of any of the load connectors and the positive side of your external power supply. Connect the negative side of your external power supply to pin 1 of the output connectors. Turn on and off the load using the corresponding command.

Customer Reviews

Based on 2 reviews
Daniel Franklin
Outstanding product

This board is fantastic, great for controlling a wide range of loads, trivially easy to interface with, comes with everything you need, scalable and flexible.

Well, it's another Pi.

It's faster, they pretty much rectified all of the previous shortcomings of the past models, most notably the absolutely crippling front side bus bottleneck (making older versions very... Impractical to say the most). Interface throughput rates make sense now, resources are up, and critical features have been added.