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: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=3061
Printed Date: 16 Oct 2024 at 3:30am
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
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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
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Replies:
Posted By: ChrisChris
Date Posted: 20 Feb 2022 at 11:25am
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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.
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Posted By: Tom H
Date Posted: 20 Feb 2022 at 12:09pm
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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:  ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: Tom H
Date Posted: 20 Feb 2022 at 12:19pm
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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. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
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
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OK, I will pull the part from POD on Monday when it's ready. Thanks, Tom!
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