ScanTAP IsoPod

Complete TAP Signal Isolation for Corelis Boundary-Scan Controllers

Protect your Hardware!

The Corelis ScanTAP IsoPod™ is an add-on accessory that provides a galvanic isolation barrier between the target system and the boundary-scan (JTAG) controller hardware. While the Corelis boundary-scan controllers are highly robust and reliable, the complete electrical isolation helps prevent damage to the controller from harsh electrical environments where over-voltage and over-current can damage components.

This Corelis ScanTAP IsoPod was designed to add an additional layer of protection with minimal cost and effort. Open the box and plug it in; everything just works.


  • 4 kV isolation barrier helps prevent damage to hardware

  • 3.3 V TAP interface

  • Supports JTAG test clock (TCK) frequencies up to 40 MHz

  • Supports I2C and SPI programming speeds up to 1 MHz

  • Compatible with Corelis boundary-scan controllers

  • Compatible with the ScanExpress™ family of boundary-scan and functional test products

  • Standard Corelis 20-pin TAP connectors


Harsh Electrical Environments may damage boundary-scan controllers and test PCs through over-voltage or ESD.

Untested Targets pose the greatest risk for damage to boundary-scan controllers if TAP signals are shorted to power.

Un-keyed TAP Connectors where user error can often result in accidentally driving signals into power or ground.

Ground Potential Mismatches often cause damage due to over-voltage and over-current when connecting components from different systems.

Ground-loops occasionally cause signal integrity issues that are eliminated using digital isolation.

ScanTAP IsoPod

ScanTAP IsoPod
ScanTAP IsoPod

Typical ScanTAP IsoPod Application


  • Prevent time loses due to manufacturing lines and development grinding to a halt when a boundary-scan controller is damaged.

  • Cut costs from repairing test machines, controllers, and targets due to damage.

  • Limit damage to the boundary-scan controller caused by operator error.

  • Simple to use, the ScanTAP IsoPod is functionally transparent so no changes to the hardware test setup are needed.

  • Compatible with all Corelis boundary-scan controllers without the need for custom test cables.

Ordering Information

Part Number 10406

Additional Information:

  • Application Note #09-0106
    Using the ScanTAP IsoPod to Prevent Hardware Damage in Harsh Electrical Environments
  • ScanTAP IsoPod Quick Start Tutorial
  • ScanTAP IsoPod User’s Manual

Need Assistance?

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If you would like assistance with implementing JTAG testing in your design, or you are simply short of resources, our talented and experienced engineering staff can help you with all your JTAG needs.

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