HD3SS215: About HD3SS215IZXHR - Another fanout with larger tracks

Hi,

Please see this app note, https://www.ti.com/lit/an/spraa99c/spraa99c.pdf, in particular section 2. Can you use micro blind via option to create escape option from the BGA?

Thanks

David

Hi,

I made a design with 3615 vias and the manufacturers told it is very difficult to make.

So for the HD3SSXXX I decided to use tracks with a width of 90um.

Hi,

Are you ok with the width of 90um or looking for more support?

Thanks

David

What do you mean, David?

Hi,

Are you looking for a wider than 90um trace, or are you ok with the 90um trace?

Thanks

David

It would be wonderful if we could have 100 um but with a space of 250 um between balls, I don't see the solution.

In fact there are 2 options:

1/ a track with a width of 83.3 um and a space of 83.3 um

2/ a track with a width of 90.0 um with a space of 80.0 um

The option selected is not the same for several manufacturers.

Hi,

Looking at our HD3SS215EVM, the EVM is using 83um wide trace.

Thanks

David

Hi David,

Thanks for reply.

What is cheaper, 83.3/83.3 or 90/80?

Good question.

Michel

Michael

I honestly don't know, you may want to check with the PCB vendor on the cost difference between the two.

Thanks

David

I would suggest it is better to have a larger track.

I asked the question "what is the best option?", I never got the same answer...

I agree with you, David. This is 90 um which is the nearest from the target.

Now the tracks with 90 um are short compared to the overall length.