[USB-303] 2 Port USB Isolator HuMANDATA LTD.

[USB-303] 2 Port USB Isolator 

RoHS6 2ch Isolated windows and mac SurgeProtection Flame-retardant-ABS

USB Isolator with two independent isolation
Improved reliability is protected from the noise

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USB-303 is a USB 2.0 Full Speed (12Mbps) and Low Speed (1.5Mbps) compliant USB hub which isolates between a USB host and two downstream ports with 3000VDC. Each of the two downstream ports are also isolated independently. With USB-303, it can be expected to eliminate ground loops that can cause measurement errors and equipment from surges, common-mode voltage, static discharge, magnetic fields, and radio frequency interference.There is no need to install any drivers. It works with every operating system such as Windows, Linux, Mac OS X.



  • Each two downstream port are independent isolation
  • USB host connector which is standard Type B female and have to be connected to a PC or other USB host device
  • Two USB target connectors which are standard Type A female and have to be connected to some USB peripheral devices
  • USB 2.0 Full Speed (12Mbps) and Low Speed (1.5Mbps) Speed compliant
  • OS-Independent (No drivers required)
  • USB-303 is powered through a USB port (Bus-powered) or an AC adapter (Self-powered)
    DC-DC converter supply isolated voltage to a USB peripheral device from a USB host if no external power supply is present
  • 3000VDC bus isolation
  • ESD and surge protection
  • Housing material: Plastic
  • DIN rail, magnet, and screw mountable (Attachment is required)
  • Includes a USB cable (1.8m)
  • Includes an AC adapter
  • Non-use of 6 Restricted substances of RoHS directive


Item Description Remarks
Model USB-303  
Input Power 5VDC
Supplied through a USB port(Bus-powered) or AC adapter(Self-powered)
Recommend the use of an AC adapter for stably supply
An AC adapter supply to the host side.
Supplied Current to Target device 500mA/port max.  
Support OS OS-Independent (No drivers required)  
HOST Interface USB 2.0 Compliant
(Supports Full and Low Speed)
USB 1.1 compatible
Hi Speed is not supported.
ESD protection ESD 11kV
Port Number 2 port ESD protection ESD 11kV
USB Connector Host: Standard Type B Female
Target: Standard Type A Female ×2
Isolation Method Bus Isolation (Independent isorated)  
Isolation Protection 3000VDC Designed value
LED ST: Status LED ×2  
Operating Ambient Temperature -20 to 60℃ (-4 to 140 [°F]) No condensation permitted
Operating Ambient Humidity 30 to 85%RH No condensation permitted
Storage Ambient Temperature -20 to 60℃ (-4 to 140 [°F]) No condensation permitted
Storage Ambient Humidity 30 to 85%RH No condensation permitted
Noise Tolerance Not defined  
Transmission and other Standard Not defined  
Dimensions 69 x 82.5 x 30 [mm]
(2.638" x 3.248" x 1.181")
Without projections
Weight Approx. 120 [g] Only main body

Package Contents

  • USB-303
  • USB A-B cable 1.8m
  • AC Adapter


Price and Optional Accessories

Description MODEL Image List Price (JPY) Stock Status
2 port USB Isolator USB-303 USB-303
Attachment with clamping screw
PEN-003 PEN-003
Attachment for 35mm DIN rail
Attachment with neodymium magnet
PEN-003-MG PEN-003-MG


© HuMANDATA LTD. - Altera & Xilinx FPGA Boards manufacturer in Japan - 2016