-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

topic 507

Converting to Pd/Ni Preplated Leadframes


I work for a semiconductor manufacturer that is looking to convert to Pd/Ni pre-plated leadframes. Would appreciate any helpful hints/tips for processing. For instance:
1. Any tips on die attach, wirebonding or molding parameters?
2. How does one go about mold deflash? Classical deflash for semiconductor plastic packages includes: chemical, slurry, dry media, electrochem but all of these are too harsh for relatively thin Ni/Pd plating.
3. Any hints on trimming/forming? Does thin plating flake off or scratch easily?


Dennis Foster


Dennis, the first question is Whose Pd/Ni are you using? (buying?) The Three basic types have different degrees of mechanical integrity and chemical resistance. The TI 2 step? The TI 4 step? the Lea Ronal 3 step, or the AT&T 3 step? As you may know already, none of these solder very well after deflash, so TI suggests post-plating with Sn/Pb (the "Preferred Embodiment"). Best bet is to contact your leadframe supplier, find out the process vendor, and request deflash process alternatives. In my experience, the slurries work pretty well; you just have to adjust parameters for your particular flash conditions. Check out the other Pd/Ni inquiry on this web page [letter 478] for additional Info.
Good Luck,

Dave Kinghorn
Dave Kinghorn
Chemical Engineer
SUNNYvale, California

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2017     -    Privacy Policy
How Google uses data when you visit this site.