Haw Fong,
    It is very important to understand the different types of OSP available and
the specific reason to select one versus another.  We use two types;  Enthone
CU-56 and Enthone 106A.
    CU-56 is only intended for a single thermal excursion; (one reflow or
soldering process).  The material only protects the copper surface through one
extreme exposure to heat.
    106A  will allow two or three thremal/soldering cycles while still providing
protection.  If your process requires multiple cycles in assembly, you need an
appropriate OSP.
    If you need additional info, you could check with Enthone, or give me a
call.

Terry Regan
HADCO
602-232-9168


____________________Reply Separator____________________
Subject:    [TN] HELP NEEDED ON OSP QUALITY ON THE THM COMPONENT SOLDERB
Author: "LAI;HAW FONG" <[log in to unmask]>
Date:       10/7/98 8:41 AM

Dear TechNetters

Recently we are evaluating the use of OSP ( Organic Solderbility
Preservative ) on Mixed Technology PCB where by we have
both PTH ( Plated Thro' Hole ) or THM ( Thro' Hole Mount ) and SMTcomponent
on board

It was claim that OSP will provide a good solderbility on the board itself
but limited to SMT device only. it will not provide
the good joint on PTH component.

Was this the real case ????

Your help and brilliant  advise is needed urgently and appreciated it in
advance

Thanks and Best Rgds
HF Lai
Unico Technology


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