USB-104-IHUB Acces Four Rugged Isolated USB Ports Module

The Acces USB-104-IHUB Four Rugged Isolated USB Ports Module utilizes a high-performance, low-power USB 2.0 hub controller. It is USB-IF certified, Windows Hardware Quality Lab (WHQL) compliant, and its operating temperature is rated for industrial grade environments. Being able to operate at industrial grade temperatures, the USB-104-IHUB offers its functionality to a wider range of user applications that many competitors' USB hubs can't provide.
Careful attention has been paid to isolation design, including extensive keep-out zones and hand-routed circuit paths, as well as component and material selection. Robust EFT, Lightning, and ESD protection at +/-20kV on all signal pins (air and contact). TRU-ISO by ACCES I/O Products, Inc., for true signal isolation.

The card has LEDs that indicate its status. A green LED near the upstream port's high-retention type B connector (visible through a cutout in the enclosure) indicates power to the upstream side. Each downstream port has two respective LEDs that provide status. A green LED near the downstream port's high-retention Type A receptacle (visible through a cutout in the enclosure) indicates that the port is enabled whereas the red LED indicates an overcurrent fault condition.


The USB-104-IHUB needs bus power (from the USB upstream host port) and a medical grade external supply for isolated power. All Type A and the Type B USB connectors on the board feature a high retention design that complies with the class 1, Div II minimum withdrawal requirement of over 3 pounds of force (15 Newtons). This connector has an orange color-coded insulator to quickly differentiate it from standard USB connectors. Using these USB connectors increases reliability and ensures a tight connection. For embedded OEM type applications, all ports (upstream and downstream) have an alternative miniature USB header in parallel with the standard port connector. This method facilitates the smallest possible footprint to be occupied by the hub and associated cables.

The board is designed to be used in rugged industrial environments but is small enough to fit nicely onto any desk or testing station. The module is PC/104 sized at 3.550" by 3.775", while the enclosure is approximately 4" x 4" x 1".