offers excellent corrosion protection of the underlying copper and has inherent corrosion resistance.
Analysis of the HASL
finish indicated a non-uniform thickness, and at certain locations, the finish was thin enough to permit the underlying copper to overwhelm the alloy analysis.
The three main drivers that push the electronics industry to consider HASL
alternatives are cost, technology and the need for a new lead-free material to meet RoHS requirements.
A "good percentage" of its product remains HASL
, and they asked when HASL
would go away.
Yes, it is "old"; HASL
came about in the mid '70s and was quickly adapted as "the way" to finish through-hole PCBs with a SnPb coating.
A similar scenario is created when using non-flat surface finishes like HASL
and hot-air leveled (HAL).
Published in December 2005, IDC's "Worldwide Hardware Authentication Token 2005-2009 Forecast and 2004 Vendor Shares" report places Aladdin's HASL
HL ahead of all other providers, noting $50.
PCB surface finish types such as HASL
, immersion gold or immersion silver are some of the common outsourced processes.
Merix customers have found that this surface finish can result in improved yields during the assembly process, and it can perform as a replacement for HASL
(Hot air solder leveling).
COPPER THICKNESS TYPICAL TOP SIZE (X2 TOP SIZE (X2 WEIGHT (T) REDUCTION & Y2) & Y2) ENIG, OSP, HASL
Ag, & Sn 0 5 OZ 17.
Handles CSP and QFN on Pb-free board finishes, OSP, immersion Ag, immersion Sn, ENIG and LF HASL
When used as a replacement for HASL
, Immersion Silver provides the additional environmental benefit of reducing lead content in the manufacturing process.