Electronics Forum | Mon Dec 13 00:48:33 EST 1999 | armin
Hi All I have a 0.7 mm diameter hole for vias, what�s the minimum annular ring for this hole diameter? What�s the term unsupported and supported holes refer to in IPC-2221 9.1.2 Annular Ring Requirements? I have a proto-type PCB (designed by our R&
Electronics Forum | Tue Dec 14 22:17:33 EST 1999 | Dave F
Armin: How ya doin� bud? CK gives good advice, but I'd like to take a bit of a different angle. Q1. For 0.7 mm (0.027in) diameter hole for vias, what�s the minimum annular ring for this hole diameter? Depends on what you�re trying to do. For in
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_pcb-design-in-the-1970s_topic2333.xml
. The primary goal of solder mask back in the 70’s was toprotect the bare copper traces from oxidation and the acronym SMOBC wascreated
Imagineering, Inc. | https://www.pcbnet.com/capabilities/assembly/tolerances/
, SMOBC/HAL, All Finishes acceptable Markings: Silkscreen, Solder Mask (preferred)…not required on PCB, assembly drawings can work as a replacement to silk screen Material: Rigid, Rogers 4000, Flex, Rigid Flex, Metal
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