Terminal Density Level of BGA footprints

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   I'm wondering if it's intended that there isn't an option for setting the Density Level on BGA parts, i.e., Least, Nominal, and Most. I can't remember for sure, but I thought in older versions of Footprint Expert you could.

I'm working on a tight machine-assembled board, so I've been using Least for all my footprints. I just made a new BGA footprint and the courtyard looks rather large; maybe that is the size the courtyard needs to be. The package of the part is 1.4 by 0.9 mm (it's a small 6 pin logic gate), and the courtyard looks about 4 times the size of the part.

On a 0402 resistor it looks like the courtyard is 0.1 mm, but on this part it was about 0.5 mm out.

The package family is the TI YZP: https://www.ti.com/lit/ml/mxbg347/mxbg347.pdf

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asdfasdfa Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 26 Mar 2019 Status: Offline Points: 4	Post Options Post Reply Quote asdfasdfa Report Post Thanks(0) Quote Reply Topic: Terminal Density Level of BGA footprints Posted: 18 Feb 2022 at 1:17pm
	I'm wondering if it's intended that there isn't an option for setting the Density Level on BGA parts, i.e., Least, Nominal, and Most. I can't remember for sure, but I thought in older versions of Footprint Expert you could. I'm working on a tight machine-assembled board, so I've been using Least for all my footprints. I just made a new BGA footprint and the courtyard looks rather large; maybe that is the size the courtyard needs to be. The package of the part is 1.4 by 0.9 mm (it's a small 6 pin logic gate), and the courtyard looks about 4 times the size of the part. On a 0402 resistor it looks like the courtyard is 0.1 mm, but on this part it was about 0.5 mm out. The package family is the TI YZP: https://www.ti.com/lit/ml/mxbg347/mxbg347.pdf



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 18 Feb 2022 at 1:34pm
	The 3-tier density levels for BGA are broken down by Ball Diameter and the pad size % reduction. You can change the Courtyard setting in "Tools > Options> Terminals > SM Grid Array > BGA"
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