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| From [log in to unmask] Wed Sep 25 13: |
00:17 1996 |
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Perhaps HASL is not the surface finish that should be used in your assembly
process? HASL is not a plated finish so there will be wide variations in the
coating thickness. Electroless Nickel / Immersion Gold or organic coatings
will always have the best surface uniformity.
[log in to unmask] Wrote:
|
| Does anybody know what is the tin-lead HASL plating
| thickness requirements
| for printed circuit boards? Do you have any standards
| which specified it?
| IPC-A-600D specified only the minimum plating thickness,
| which is 0.005mm
| or 0.0002" for our application.
| We are having a problem with the circuit board which
| plating thickens is
| greater than the other ones. Also, the plating surface
| is not flat.
| This is not the fine pitch components board. But, when
| pads are so
| "bumpy" and plating is thicker than other boards, the
| adhesive dots
| application becomes difficult. Glue dispenser shall be
| adjusted for the
| proper adhesive dots size.
| It would be greatly appreciated if anyone could give me
| any directions.
|
|
|
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