TVS diode with marker

Some components that are needed to be be in a certain direction (like most diodes, and some capacitors) there is a white line over the component to show the direction.

But why is this done for a P6KE43CA, Bi-Directional TVS Diode, 600W, 2-Pin DO-204AC like the picture below. Does the direction matter since it is bidirectional?

enter image description here

TVS diode without marker

This is how mine look like from P6KE15CA; sorry for the bad picture, I do not have the TVS diodes at hand so used a screenshot crop from the page I bought them from:

enter image description here

  • 1
    Your link is broken. – Hearth Oct 11 at 12:57
  • @Felthry THanks for the notification (and fixed). – Michel Keijzers Oct 11 at 13:07
  • 2
    Do you have the part in your hand and can see the direction marker on it? It's possible they're using a generic image for the entire series, which includes both unidirectional and bidirectional devices. – Hearth Oct 11 at 13:08
  • @Felthry I don't have them at hand, just found a similar ones when I noticed the clear line. I updated my question with the ones I have. – Michel Keijzers Oct 11 at 13:14
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    Those don't appear to have a direction marker. – Hearth Oct 11 at 13:15
up vote 5 down vote accepted

In all likelihood, the site you linked to is simply using a generic picture for the entire P6KE series, which includes both unidirectional and bidirectional devices. As your second image shows, P6KExxCA devices do not have a direction marker.

enter image description here

This excerpt from the datasheet provides further evidence of this. The unidirectional devices in the series do have a direction mark, but the bidirectional ones do not.

Generally, don't trust the images on distributors' websites, especially if they appear to be CG rather than actual photographs of the product. And even photographs can lie; I've come across a part with a picture of a large contactor that was actually a mechanical hole seal! Always check the details and datasheet.

  • Thanks for this answer ... that means the direction is not important (which I expected). – Michel Keijzers Oct 11 at 13:45
  • You're welcome! – Hearth Oct 11 at 13:46

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