PCB Libraries Forum : Hole size for through hole compoent https://www.PCBLibraries.com/forum/ Sat, 11 Jul 2026 16:36:35 +0000 Thu, 16 Dec 2021 13:49:07 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3025 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Hole size for through hole compoent : I am not asking about pad size...]]> https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12057.html#12057 Author: jnbrown
Subject: 3025
Posted: 16 Dec 2021 at 1:49pm

I am not asking about pad size or annular ring.
I am asking about drilled hole size.
The IPC recommendation says Minimum hole size.

]]> Thu, 16 Dec 2021 13:49:07 +0000 https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12057.html#12057 <![CDATA[Hole size for through hole compoent : In Tools &gt; Options &gt; Terminals...]]> https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12056.html#12056 Author: Tom H
Subject: 3025
Posted: 16 Dec 2021 at 1:27pm

In Tools > Options > Terminals > Through-hole 

There is a setting for "Minimum Annular Ring"

In the 60-year history of PCB design, the PCB designer should know what the minimum annular ring needs to be to compensate for the +/- 3 mil drill hole tolerance. 

]]> Thu, 16 Dec 2021 13:27:42 +0000 https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12056.html#12056 <![CDATA[Hole size for through hole compoent : I did not have the Min/Max button...]]> https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12055.html#12055 Author: jnbrown
Subject: 3025
Posted: 16 Dec 2021 at 12:35pm

I did not have the Min/Max button selected.
Now I entered 1.02 +/- 0.05mm for the lead size and I am getting 1.25mm for the hole size.
Where is the +/-3 mil drilled hole tolerance taken into account in the calculator?


]]> Thu, 16 Dec 2021 12:35:30 +0000 https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12055.html#12055 <![CDATA[Hole size for through hole compoent : Makes perfect sense, but in every...]]> https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12054.html#12054 Author: Tom H
Subject: 3025
Posted: 16 Dec 2021 at 12:07pm

Makes perfect sense, but in every through-hole calculator in V2021 Footprint Expert the user must enter the minimum and maximum lead diameter. 

i.e.: the tolerance is built into the calculator. 

A maximum lead diameter of 1.02 should produce a 1.22 hole, but it totally depends on your Hole Size Round-off is in Tools > Options > Terminals > Through-hole > Hole Size Round-off > 0.05 (will round-off to the nearest 0.05 mm value). 

]]> Thu, 16 Dec 2021 12:07:17 +0000 https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12054.html#12054 <![CDATA[Hole size for through hole compoent : I am using a power module that...]]> https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12053.html#12053 Author: jnbrown
Subject: 3025
Posted: 16 Dec 2021 at 11:58am

I am using a power module that has 1.02mm diameter round pins.
In Footprint Expert I specified a through hole header with 1.02mm round pins.
The resulting hole size is 1.20mm.
I found this IPC information:

Minimum Hole Size = Maximum Lead Diameter + 0.20mm (for Level B of IPC-2222)

Being the manufacturer of the power module does not specify a tolerance I figure I should at least add a few mils to the diameter. Also through hole drill usually has a tolerance of +/- 3 mils. So going by IPC recommendation I am figuring 1.02mm + 0.127mm for tolerances + 0.2mm = 1.347mm.

Does this make sense?

Thanks
]]> Thu, 16 Dec 2021 11:58:04 +0000 https://www.PCBLibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12053.html#12053