PCB Libraries Forum : Molded body polarity marking https://www.PCBLibraries.com/forum/ Mon, 20 Apr 2026 22:39:23 +0000 Mon, 01 Jul 2019 07:35:30 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2502 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Molded body polarity marking : You should add a Pin 1 polarity...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10325.html#10325 Author: Tom H
Subject: 2502
Posted: 01 Jul 2019 at 7:35am

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. 

]]> Mon, 01 Jul 2019 07:35:30 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10325.html#10325 <![CDATA[Molded body polarity marking : We&#039;ve been including a...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10322.html#10322 Author: 5not4
Subject: 2502
Posted: 01 Jul 2019 at 6:53am

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. 

]]> Mon, 01 Jul 2019 06:53:48 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10322.html#10322 <![CDATA[Molded body polarity marking : Ian - These are good articles....]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10307.html#10307 Author: Tom H
Subject: 2502
Posted: 26 Jun 2019 at 6:48am

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!

]]> Wed, 26 Jun 2019 06:48:27 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10307.html#10307 <![CDATA[Molded body polarity marking : Following up on this subject here&#039;s...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10306.html#10306 Author: Ian S
Subject: 2502
Posted: 26 Jun 2019 at 1:24am

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
https://product.tdk.com/info/en/contact/faq/faq_detail_D/1432554144352.html

Ian



]]> Wed, 26 Jun 2019 01:24:32 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10306.html#10306 <![CDATA[Molded body polarity marking : We only add Polarity Markings...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10303.html#10303 Author: Tom H
Subject: 2502
Posted: 25 Jun 2019 at 10:16am

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. 

]]> Tue, 25 Jun 2019 10:16:17 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10303.html#10303 <![CDATA[Molded body polarity marking : Thank you Tom for looking this...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10302.html#10302 Author: Tempest
Subject: 2502
Posted: 25 Jun 2019 at 10:10am

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
]]> Tue, 25 Jun 2019 10:10:44 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10302.html#10302 <![CDATA[Molded body polarity marking : Here is the PanasonicETQP4M220YFP...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10301.html#10301 Author: Tom H
Subject: 2502
Posted: 25 Jun 2019 at 10:01am

Here is the Panasonic ETQP4M220YFP Molded Body Inductor. 

Download it here (much more Terminal Lead Detail) - 3D STEP

Here is what it looks like and I don't see any Polarity Marking - 



]]> Tue, 25 Jun 2019 10:01:08 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10301.html#10301 <![CDATA[Molded body polarity marking : Hi Tom,Some indicate polarity...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10300.html#10300 Author: Tempest
Subject: 2502
Posted: 25 Jun 2019 at 9:46am

Hi Tom,

Some indicate polarity like the Panasonic part numberETQP4M220YFP, 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

]]> Tue, 25 Jun 2019 09:46:42 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10300.html#10300 <![CDATA[Molded body polarity marking : The Molded Body Inductor is bi-directional.It...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10299.html#10299 Author: Tom H
Subject: 2502
Posted: 25 Jun 2019 at 9:30am

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? 

]]> Tue, 25 Jun 2019 09:30:27 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10299.html#10299 <![CDATA[Molded body polarity marking : On a 3D step model, wondering...]]> https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10298.html#10298 Author: Tempest
Subject: 2502
Posted: 25 Jun 2019 at 8:16am

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
]]> Tue, 25 Jun 2019 08:16:37 +0000 https://www.PCBLibraries.com/forum/molded-body-polarity-marking_topic2502_post10298.html#10298