Molded body polarity marking
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=2502
Printed Date: 06 Oct 2024 at 10:20pm
Topic: Molded body polarity marking
Posted By: Tempest
Subject: Molded body polarity marking
Date Posted: 25 Jun 2019 at 8:16am
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On a 3D step model, wondering why I'm not seeing a polarity mark on a molded body inductor, is the 3d step just not supporting this?It's been like this for a while just curious. Thanks,
Paul |
Replies:
Posted By: Tom H
Date Posted: 25 Jun 2019 at 9:30am
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The Molded Body Inductor is bi-directional. It can be inverted during assembly. Can you provide the URL link to a datasheet that has a Polarized Inductor? ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: Tempest
Date Posted: 25 Jun 2019 at 9:46am
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Hi Tom, Some indicate polarity like the Panasonic part number
ETQP4M220YFP, regardless as to if that is true or not. The software does give the option for polarized inductor so I'd kinda expect a pin 1 indicator. Thanks, Paul |
Posted By: Tom H
Date Posted: 25 Jun 2019 at 10:01am
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Here is the Panasonic ETQP4M220YFP Molded Body Inductor. Download it here (much more Terminal Lead Detail) - http://https://industrial.panasonic.com/ww/products/inductors/automotive-inductors/automotive-inductors/power-choke-coil-automotive-metal-core-type-mc/ETQP4M220YFP" rel="nofollow - 3D STEP Here is what it looks like and I don't see any Polarity Marking -  ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: Tempest
Date Posted: 25 Jun 2019 at 10:10am
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Thank you Tom for looking this up, nice model. I'm still wondering though, is Lib expert not supporting inductor polar marking and if not is it going to be. If not maybe consider removing the option. Thank you
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Posted By: Tom H
Date Posted: 25 Jun 2019 at 10:16am
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We only add Polarity Markings to packages that are polarized. Show me a polarized inductor and we'll add it. Otherwise, all inductors like all resistors, can be inverted during assembly. We do not want to confuse the assembly process with unnecessary polarity markings. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: Ian S
Date Posted: 26 Jun 2019 at 1:24am
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Following up on this subject here's some inductor polarity-related reading: https://www.murata.com/products/emiconfun/inductor/2012/05/14/en-20120514-p1" rel="nofollow - https://www.murata.com/products/emiconfun/inductor/2012/05/14/en-20120514-p1 https://product.tdk.com/info/en/contact/faq/faq_detail_D/1432554144352.html" rel="nofollow - https://product.tdk.com/info/en/contact/faq/faq_detail_D/1432554144352.html Ian |
Posted By: Tom H
Date Posted: 26 Jun 2019 at 6:48am
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Ian - These are good articles. I wonder why the manufacturer's 3D models do't have a polarity marking. I've been involved in over 2,000 PCB layouts since 1974 and I've never added Polarity Marking on Inductors on the silkscreen Legend. I'm going to rethink this for the future. Thanks! ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: 5not4
Date Posted: 01 Jul 2019 at 6:53am
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We've been including a Pin 1 indicator on inductors when the manufacturer supplies it for the past few years. It was discovered during EMC testing that the polarity (a term I find inaccurate, should be more related to Pin 1 or the winding start pin) could be critical during PCB layout.
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Posted By: Tom H
Date Posted: 01 Jul 2019 at 7:35am
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You should add a Pin 1 polarity marking on the silkscreen legend and the assembly drawing. This would help the assembly process, but also increase the performance of the PCB layout. I haven't seen a Pin 1 polarity marking on the mfr. provided 3D STEP models. If you have inductors lined up side by side, it's a good idea to point all Pin 1's in the same direction so that all the coil starting points are in the same direction. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |