• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 925 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPD4E001: Should TVS diodes be connected on the Vcc side

Carolus Andrews
Mastermind 18780 points
Part Number: TPD4E001
Other Parts Discussed in Thread: TPD4E05U06, TPD4E1U06

Team,

I have a customer that has commented that they typically do not connect the Vcc side because in my experience, it can direct ESD discharge current into the supply rail, and can disrupt a uC.  This also state that this is more likely when the product does not have a chassis or frame, per se, for the ground side, correct. Do we have any comment as to our recommendations on whether or not TVS should be applied to the Vcc side of the circuit?

For the TVS array, I usually do not connect the Vcc side because in my experience, it can direct ESD discharge current into the supply rail, and
can disrupt a uC.  This is more likely when the product does not have a chassis or frame, per se, for the ground side.  Just wondering what your experience has been with other customer usage.  I’ve designed many products with similar devices and always left the Vcc unconnected successfully.

  • 0
    TI__Genius 12410 points
    Hello,
    When it comes to the VCC pin on ESD diodes it can be used as an ESD diode for the VCC rail but you are correct that mainly it is used to steer current to the supply rail.
    Also It was used in the past to try and lower the capacitance on the I/O line. However, now with the new parts we have out we can achieve very low capacitance while still having a very robust solution.
    Overall they both work but if you do have a supply rail that is sensitive then go with a device without a VCC pin such as TPD4E1U06 or if you want to go to a better flow through package you could use TPD4E05U06. If you need a suggestion for a part number if you tell me what application it is on I will give you the best recommendation.