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859 expert questions.

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Jun 24, 2022
Need for Reflow Profiles
How important is it to run a profile on every different assembly? I have been told choosing an ...
E. R.

Concerns With Silver Finish Component Leads
A few of the components we are using have leads with silver finish. Will silver cause solder embrittlement ...
S.A.

BGA re-balling process
Can you recommend a process or semi-automatic machine for re-balling BGA's? Is there a process or system available ...
J.S.

Mixed Process Solder Joint Appearance, Smooth or Grainy?
We are using RoHS components that are placed using tin/lead solder paste and soldered in oven using a ...
P.W.

Reflow Profile for Mixed Lead-Free and Leaded
What changes are required for using tin/lead paste on lead-free circuit boards? Does the oven profile have to ...
M.W.

Oxidation of Solder Balls During Secondary Reflow
Can solder balls oxidize and create opens during a second reflow if the circuit board assemblies were properly ...
M.A,

Burned Chip Repair
I have a circuit board with a burned chip. The manufacturer wants to charge an arm and a ...
D.D.

Matte Black Solder Mask Defects
We're working with a PCB vendor to fabricate panels of 6-layer circuit boards with ENIG plating and matte ...
M.C.

Conformal Coating Recommendation
We are developing an outdoor LED module. This module will needconformal coating to prevent humidity issues and protect ...
Y.F.

Excess Flux Residue After Hand Soldering
We observe an excessive amount of flux after hand soldering terminals using flux cored wire solder. See the ...
K.K.

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