USB Isolator with two independent isolation
Improved reliability is protected from the noise
Permalink of this page:
Overview
USB-303H2 is a USB 2.0 isolator and an isolated USB hub featuring two independently isolated ports.
It provicles isolation of USB interface, enabling separation between USB host equipment (such as computers) and peripheral devises.
There are two separate isolation circuits, providing isolation between all USB ports (host, portA and portB).
It supports USB 2.0 High Speed (480Mbps), Full Speed (12Mbps) and Low Speed (1.5Mbps).
By isolating the USB interface, it offers benefits such as improved noise resistance and enhanced precision of external analog devices (by isolating GND).
*Second and subsequent images are CG models
Features
- The two downstream ports are independently isolated.
- Two separate isolation circuits provide isolation among all USB ports (host, Port A, and Port B).
- Supports USB 2.0 High Speed (480 Mbps), Full Speed (12 Mbps), and Low Speed (1.5 Mbps) with automatic speed switching.
- High-retention USB Type-B connector on the host side.
- SG/FG switch and FG terminal on the host side.
- Plug-and-play operation; no driver installation required; OS-independent.
- Supports both bus-powered and self-powered operation.
- Equipped with an isolated DC/DC converter with sufficient capacity.
- The target-side power supply is synchronized with the host side.
- Isolation withstand voltage: DC 1500 V.
- ESD protection for USB lines.
- Housing material: Plastic (safe Isolation)
- DIN rail, magnet, and screw mountable (Attachment is required)
- Includes a 1.8 m USB cable.
- Includes an AC adapter (DC 6 V).
- Free from the 10 RoHS-restricted substances.
- MADE IN JAPAN
Specification
| Item | Description | Remarks |
|---|---|---|
| Model | USB-303H2 | |
| 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. |
| Current Consumption | Less than 250mA + current of the target device | Due to the efficiency of the internal DC/DC, more current flows to the host side than the target side. |
| Supplied Current to Target side | 500mA/port max | Suppliable current of target side must be less than supply capability of host side. |
| Support OS | OS-Independent (No drivers required) | |
| HOST Interface | USB 2.0 Compliant High Speed (480Mbps) Full Speed (12Mbps) Low Speed (1.5Mbps) |
USB 1.1 compatible ESD protection |
| Port Number | 2 port Each port is isolated independently |
ESD protection |
| USB Connector | Host: USB2.0 Type-B (Female) Target: USB2.0 Type-A (Female) x 2 |
|
| Isolation Method | Bus Isolation | |
| Isolation Protection | DC1500V | Designed value |
| LED | PW: Power LED (Host side x 1,Target side x 2) |
|
| Operating Ambient Temperature | -20 to 60℃ (-4 to 140 [°F]) | No condensation permitted |
| Operating Ambient Humidity | 20 to 90%RH | No condensation permitted |
| Storage Ambient Temperature | -20 to 60℃ (-4 to 140 [°F]) | No condensation permitted |
| Storage Ambient Humidity | 20 to 90%RH | No condensation permitted |
| Noise Tolerance | Not defined | |
| Transmission and other Standard | Not defined | |
| Dimensions | 69 x 82.5 x 30 [mm] (2.717" x 3.248" x 1.181") |
Without projections |
| Weight | Approx. 120 [g] | Only main body |
Package Contents
- USB-303H2
- USB A-B cable 1.8m
- AC Adapter
Documentation
Price and Optional Accessories
| Description | MODEL | Image | List Price (JPY) | Stock Status |
|---|---|---|---|---|
| 2 port USB2.0 Isolator | USB-303H2 | ![]() |
||
| Attachment with clamping screw |
PEN-003 | ![]() |
||
| Attachment for 35mm DIN rail |
PEN-003-DIN | ![]() |
||
| Attachment with neodymium magnet |
PEN-003-MG | ![]() |


User's manual, Outline Drawing, etc




