PCB Libraries, Inc. | https://www.pcblibraries.com/forum/proportional-throughhole-padstacks_topic90_post1476.html
. Where as IPC-7251 uses the same annular ring for each environment regardless of how big the hole size is. Example: The IPC-7251 annular ring for Nominal Environment is 10 mil (0.25 mm
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_are-librarians-adding-a-pin-one-dot-to-tiny-comps_topic2459.xml
. Thank you Tom. Are librarians adding a pin one dot to tiny comps? : A 15 Mil dot is about the smallest... Author: Tom HSubject: 2459Posted: 29 Mar 2019 at 8:37amA 15 Mil dot is about the smallest for both the fabrication shop and the human eye
Imagineering, Inc. | https://www.pcbnet.com/capabilities/assembly/tolerances/
. They provide enough variation for us to assemble your board – and for it to work properly in your application. Supported PC Board Specs: Min size: 1.967 in. X 1.967 in. Max size: 19.67 in. X 19.67 in. Min thickness: 4 mil Max thickness: 240 mil Layer Count: Up to 24 Finishes: HASL, ENIG, Silver
ORION Industries | http://orionindustries.com/pdfs/fr700.pdf
— 1.32 Area Factor Calculation ft2/lb/mil 145.75 m2/lb/mil 13.54 Water Absorption, Equilibrium, 24 Hrs ASTM D570 % 0.28 MECHANICAL Tensile Strength ASTM D882 psi
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_pcb-design-basics_forum8.xml
0.15 mm (6 mils). The big issue is the pad annular ring. The fab shop will add 3 - 4 mils to the finished hole size. Then you must consider drill drift and layer to layer tolerance of 3 mil
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/footprint-expert-2021-07-released_topic2923.html
!! Updates & Bugs Fixed: Updated all the CAD tool interface UI menus. Updated the V2021 FPX File Converter. Console Options: Mil Units – working strictly in Mil units slightly altered the pin pitch in Gull Wing, J-Lead and Bottom Terminal footprints
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic2923&OB=DESC.html
!! Updates & Bugs Fixed: Updated all the CAD tool interface UI menus. Updated the V2021 FPX File Converter. Console Options: Mil Units – working strictly in Mil units slightly altered the pin pitch in Gull Wing, J-Lead and Bottom Terminal footprints
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/footprint-expert-2021-07-released_topic2923_post11645.html
!! Updates & Bugs Fixed: Updated all the CAD tool interface UI menus. Updated the V2021 FPX File Converter. Console Options: Mil Units – working strictly in Mil units slightly altered the pin pitch in Gull Wing, J-Lead and Bottom Terminal footprints
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2923&OB=ASC.html
!! Updates & Bugs Fixed: Updated all the CAD tool interface UI menus. Updated the V2021 FPX File Converter. Console Options: Mil Units – working strictly in Mil units slightly altered the pin pitch in Gull Wing, J-Lead and Bottom Terminal footprints
Imagineering, Inc. | https://www.pcbnet.com/blog/the-ever-changing-world-of-pcbs-in-aerospace-applications/
. The following is a list of protocols that need to be adhered to, to achieve the best PCB for the Aerospace industry . Using precise mil/spec techniques Ensuring shielded and clean signals Achieving proper aspect ratios Building-in additional cushion of electricity Using an extra layer and mechanical punctures
