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SOT353 with Different Pin 1 Orientation

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: http://www.PCBLibraries.com/forum/forum_posts.asp?TID=3061
Printed Date: 06 Feb 2023 at 6:19am


Topic: SOT353 with Different Pin 1 Orientation
Posted By: ChrisChris
Subject: SOT353 with Different Pin 1 Orientation
Date Posted: 20 Feb 2022 at 11:22am
Hello,

I have a somewhat odd example of an SOT353 package with 2 different pin 1 cases as follows:



I created the SOT353 with the Calculator and then cloned the part and renamed it SOT353-180D. I now need to customize this version by moving the pin 1 chamfer to the upper right without renumbering the pads. How would you recommend doing this? It does not seem like I can open a part in FP Designer that was created using the calculator. Is my only option to create this part from scratch in FP Designer?

Thanks,
Chris



Replies:
Posted By: ChrisChris
Date Posted: 20 Feb 2022 at 11:25am
FYI... I checked and you have this part available for free in POD but it is wrong. 

Pin 1 should be as I've indicated above in SOT353-180D. 

The part number is Diodes Inc. MMBD4448HCQW.



Posted By: Tom H
Date Posted: 20 Feb 2022 at 12:09pm
I guess Diodes, Inc. has multiple pin configurations for their SOT-353. Very unusual for a top-rated component manufacturer. 

Diodes does not call the Case Code for the MMBD4448HCQW part number SOT353-180D. 

Nor does it actually print the pin assignments in the MMBD4448HCQW datasheet - 
https://www.digikey.com/en/products/detail/diodes-incorporated/MMBD4448HCQW-7-F/806873" rel="nofollow - MMBD4448HCQW-7-F Diodes Incorporated | Discrete Semiconductor Products | DigiKey



 
Here's another part number: 


 


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Posted By: Tom H
Date Posted: 20 Feb 2022 at 12:19pm
The Diodes part number series MMBD4448HCQW on POD will be updated by Monday morning with the new Case Code - SOT353-180D 

Thank you for reporting this issue. 



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Posted By: ChrisChris
Date Posted: 20 Feb 2022 at 12:19pm
SOT-353-180D is my name, to differentiate the two. Anyway, the datasheet indicates case labeling will have a pin 1 marker, so assembly will be confused if I don't crate a custom part for this.


So how should I handle this?

Thanks,
Chris



Posted By: ChrisChris
Date Posted: 20 Feb 2022 at 12:21pm
OK, I will pull the part from POD on Monday when it's ready.

Thanks, Tom!





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