Adafruit USB Isolator - 100mA Isolated Low/Full Speed USB

Have some USB logic analyzer, multimeter or oscilloscope and bumping up against the frustration of a shared earth ground? The Offspring wisely sang "Ya gotta keep'em isolated!" Power and signal isolation improves common-mode voltage, enhances noise rejection, and permits two circuits to operate at different voltage levels.

This handy little low-cost USB Isolator provides protection against harmful noise, ground loops, surges, and spikes. It works with any 1.5Mbps (low speed) or 12Mbps (full speed) USB device. Please note that it is not for high speed USB devices, often used for video cameras.

Particularly useful when paired with USB testing instruments, it separates or isolates your earth ground from your circuit for high voltage, accident-protection, or floating ground needs. The isolator features its own isolated 5V power supply supplying 100mA, making it perfect for devices like the BitScope Micro USB. Protect your computer or laptop by using this isolator between your USB ports.

Designed for 5V power and 3.3V logic USB devices only; usage with other protocols or voltages is not recommended.

Features:

• Compatible with 1.5Mbps (low speed) and 12Mbps (full speed) USB devices
• Provides isolated 5V power supply with 100mA current
• Protects against noise, ground loops, surges, and spikes
• Dimensions: 52mm x 30mm x 10mm
• Weight: 8.6g
• SMT USB port in latest revision
• Micro USB connector since April 2018 revision

Technical Details:

• Size: 52mm x 30mm x 10mm (2" x 1.2" x 0.4")
• Weight: 8.6g
• EagleCAD PCB files on GitHub
• Fritzing object in Adafruit Fritzing Library

Revision History:

• December 12, 2023: Updated to SMT USB port and improved silkscreen
• April 20, 2018: Switched from Mini USB to Micro USB connector, design otherwise unchanged