Ask Helena & Leo

Question: Can you tell me if there are other reasons that components tombstone? We have looked at the pad size and the amount of paste on the pads. If this helps, the laminate is flex kapton.

Question: I have a couple of questions regarding cup terminals. J-STD-001, IPC-A-610 and IPC-A-620 all require solder to be “visible” in the inspection hole (if present). Is there a more specific requirement to this? If you had a situation...

Question: We have a couple of questions regarding the new IPC-A-610 Revision F document and vertical fill. They are: . Acceptable – Class 1,23: Minimum vertical fill of 50% or 1.2 mm for components with 14 or more leads. What is the...

Question: I was wondering if you might be able to help me. We have some strain gauges on an assembly and need to solder wires to the strain gauge pads. We are concerned that we might not be able to get two wires soldered on flat against the...

Question: As it pertains to 5.4.1.1b (IPC A 610) Maximum Insulation Clearance, does this requirement also apply to solid wire that is not purchased with insulation on? In other words when the insulation is installed on the wire and then it is...

Question: I am reviewing IPC-5704, and have a question. When reviewing table 4-1, the chloride limit is 0.75 ug/cm2, which converts to 4.4 ug/in2, however; IPC 6012 still has the board cleanliness limit for sodium chloride as 1.56 ug/cm2...

Question: I have a question concerning ceramic CCA and their bake out after aqueous wash cycle prior to parylene coating. In theory, parylene deposition will draw off any moisture before the coating process. Currently we bake at 149F for one...

Question: I see so many places say that they build to IPC-A-610, yet I thought you build to J-STD-001, and inspect to IPC-A-610. Is this correct?

Question: There has been some request by our customers asking how long products can be stored before solderability becomes a concern. Assuming the following storing conditions, Humidity-10-70% Temperature 12-30C. Does the IPC cover anything on...

Question: Do you offer training in wire bonding? If not, do you know who does?

Question: I am an IPC certified J-STD-001 and A-610 Trainer and have a question that I’m hoping you can help clarify for me. It is in regards to the interpretation of the acceptability of the top side solder filet requirements for a soldered...

Question: In the earlier J-STD-001 Space Addendums, the vision requirements stated it shall be required, but it does not state with what frequency. Is it required every two years?