Is it OK if pads go under an MSOP body?

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   I'm working on a footprint for a part that uses an MSOP-8 package. Is it normal for the pads to go underneath the body?

The package size is 2.8 mm to 3.2 mm, and the inner edges of the pads have 2.8 mm between them. This means that on a typical package size (3.0 mm) or especially the max (3.2 mm) the pads will extend under the body.

I looked at a couple manufacturer recommended land patterns and this seems to be the case on most of them. Does anyone know why this is the case, and is this an optimal land pattern design?

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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: Is it OK if pads go under an MSOP body? Posted: 17 Oct 2022 at 6:13pm
	I'm working on a footprint for a part that uses an MSOP-8 package. Is it normal for the pads to go underneath the body? The package size is 2.8 mm to 3.2 mm, and the inner edges of the pads have 2.8 mm between them. This means that on a typical package size (3.0 mm) or especially the max (3.2 mm) the pads will extend under the body. I looked at a couple manufacturer recommended land patterns and this seems to be the case on most of them. Does anyone know why this is the case, and is this an optimal land pattern design?



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 Oct 2022 at 12:10pm
	The SOP/SOIC pads under the Gull Wing lead plastic body is typical if the minimum "A1" dimension is greater than 0.03 mm. If the "A1" dimension is less than 0.03 mm then Footprint Expert will auto-trim the pad under the package. But you can turn Pad Trimming off in "Tools > Options > SMD Pad Stack Rules > Pad Trimmng. 50% of Footprint Expert users trim the low-profile body pads and 50% do not trim. It's a user option.
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