PCB Libraries Forum : PCB Marking https://www.PCBLibraries.com/forum/ Mon, 06 Apr 2026 20:33:14 +0000 Thu, 25 Oct 2012 08:30:46 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=626 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[PCB Marking : Is the &#034;M&#034; the last...]]> https://www.PCBLibraries.com/forum/pcb-marking_topic626_post2129.html#2129 Author: Tom H
Subject: 626
Posted: 25 Oct 2012 at 8:30am

Is the "M" the last character in the Footprint Name?
 
If so, it was built using the IPC-7351 "Most" Environment.
 

n  IPC-7351Density Level A: Maximum (Most) Land Protrusion – Forlow-density product applications, the 'maximum' land pattern condition has beendeveloped to accommodate wave or flow solder of leadless chip devices andleaded gull wing devices. The geometry furnished for these devices, as well asinward and “J” - formed lead contact device families, may provide a widerprocess window for reflow solder processes as well.

n  IPC-7351Density Level B: Median (Nominal) Land Protrusion – Productswith a moderate level of component density may consider adapting the 'median'land pattern geometry. The median land patterns furnished for all devicefamilies will provide a robust solder attachment condition for reflow solderprocesses and should provide a condition suitable for wave or reflow solderingof leadless chip and leaded Gull Wing type devices.

n  IPC-7351Density Level C: Minimum (Least) Land Protrusion – Highcomponent density typical of portable and hand-held product applications mayconsider the 'minimum' land pattern geometry variation.

 
 Note: IPC and IEC are both considering dropping the "Most" Envirnoment in the near future. It will still be available for PC boards that require hand-soldering. It has been proven that the "Nominal" Environment passes all the stress tests that the "Most" Environment does. So there is no longer a future need for the "Most" Environment. The "Least" environment will become the new Standard Footprint pattern coming up in the near future.
 
]]> Thu, 25 Oct 2012 08:30:46 +0000 https://www.PCBLibraries.com/forum/pcb-marking_topic626_post2129.html#2129 <![CDATA[PCB Marking : I need help determining what&#039;s...]]> https://www.PCBLibraries.com/forum/pcb-marking_topic626_post2121.html#2121 Author: mlh_biomed
Subject: 626
Posted: 24 Oct 2012 at 9:29am

I need help determining what's the component on my computer PCB marked with M, it is surface mounted similar to a capacitor or an inductor. 
 
Measured it with no resistance and has 0.12 uF.
 
Thanks
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