Electronics Forum: solder mask discoloration on a printed circuit board (Page 1 of 1)

Scratches on BGA solder resist

Electronics Forum | Tue Feb 27 22:40:28 EST 2007 | davef

IPC-A-600G, 2.9 Solder Resist [Solder Mask] [snip]"Solder resists are used to limit and control the application of solder to selected areas of the printed circuit board during assembly soldering operations and are sometimes used to reduce dendritic f

Barcode printing on the PCB

Electronics Forum | Fri Mar 12 19:09:21 EST 1999 | Jess Baker

Manufacturers who have to mark barcodes onto PCB's without secondary application of pressure sensitive labels can etch it on, screen it on, inkjet it on, use laser marking, or a combination of those. Using a laser marker to write a code into a label

Re: Need advise on regarding Vias

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

I mounted the parts on the buck-boost DCDC converter and measured the characteristics

Electronics Forum | Tue Aug 23 03:29:37 EDT 2022 | samhe

I received a buck-boost DCDC board with an optical sensor from NextPCB, so I mounted the components and measured the efficiency. Table of contents Board received from NextPCB Solder paste printing Mounting of parts Reflow operation check Attaching

soft gold vs immersion gold

Electronics Forum | Wed Aug 11 18:36:03 EDT 2004 | davef

90 Knoop. Q2: Thickness is 4 to 10 u" for Au and 300 to 400 u" for nickel A2: This looks like a ENIG spec. Although, the Ni is quite heavy, 150 uin is sufficient for most applications. [IPC-4552 ENIG specification: * Gold thickness of 0.075 - 0.125

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