HASL, shelf life, IPC standards

Subscribe to Thread

Good day, Are there any IPC standards applying requiremen... - May 03, 2017 by Hypnotia

I don't believe there should be any issues with the HASL fin... - May 03, 2017 by charliem

> I don't believe there should be any issues with &... - May 15, 2017 by EdHare

Hypnotia

#77522

HASL, shelf life, IPC standards | 3 May, 2017

Good day,

Are there any IPC standards applying requirements to HASL PCB shelf life? Are there any exact figures such as one year for instance? Could you point me to standard numbers if they exist.

Iny input would be appreciated.

Regards, Pavel

reply »

charliem

#77525

HASL, shelf life, IPC standards | 3 May, 2017

I don't believe there should be any issues with the HASL finish. The issue is how long on the shelf and is a bake out required to remove moisture from PCB, as in any FR4 PCB's that may have had time to absorb moisture.

reply »

EdHare

#77577

HASL, shelf life, IPC standards | 15 May, 2017

> I don't believe there should be any issues with
> the HASL finish. The issue is how long on the
> shelf and is a bake out required to remove
> moisture from PCB, as in any FR4 PCB's that may
> have had time to absorb moisture.

> I don't believe there should be any issues with > the HASL finish. The issue is how long on the > shelf and is a bake out required to remove > moisture from PCB, as in any FR4 PCB's that may > have had time to absorb moisture.

There is another issue, intermetallic growth, particularly if the base metal is copper with no nickel plate. Also, sometimes the HASL is not uniform, which exacerbates solderability problems upon aging. Example - http://www.semlab.com/blog/?p=111

reply »