Electronics Forum | Fri Apr 24 07:55:12 EDT 2009 | davef
TOMBSTONING OF 0402 AND 0201 COMPONENTS: "A STUDY EXAMINING THE EFFECTS OF VARIOUS PROCESS AND DESIGN PARAMETERS ON ULTRA-SMALL PASSIVE DEVICES" Michael Yuen, Heather Benedict, Kris Havlovitz, and Tim Pitsch, Plexus Electronic Assembly Corporation, N
Electronics Forum | Mon Sep 07 13:20:04 EDT 2020 | davef
Tombstone is often caused by an imbalance of temperature, pad shape or spacing, component termination, and component positioning. Pate formulation and reflow atmosphere are other common causes. Looking at the pads and components in your pictures mak
Electronics Forum | Tue Sep 18 10:22:22 EDT 2001 | jschake
Paste Flux / Reflow: Our experiments indicated that the combination of no-clean solder paste and air forced convection reflow produced the fewest tombstone defects, followed by water-soluble paste reflowed in air, and most tombstones occurring with
Electronics Forum | Wed May 10 08:41:19 EDT 2006 | russ
Yes, we added some soak, we also use a 5 zone oven. We utilize a .020" x .020" pad with center to center at .042". We only get tombstones on misplacement or bad paste release now. Registration of component is key with pbfree, the parts just don't s
Electronics Forum | Mon Feb 18 03:40:04 EST 2008 | akareti
Hi everybody, I found a defect varistor 0603 Tombstone and poor welting when we use component that terminal is Silver palladium (Ag/ Pd) with Leaded solder paste (63/37). Then we change alternative component that terminal is Ni/ Sn the result not fou
Electronics Forum | Wed May 31 13:14:42 EDT 2000 | Dason C
I learn from Senju Metal, they have a formula with certain percent of Ag and Cu can elimate the tombstone. The hint is the eutectic only one reflow and the new material have two reflow. Please let me know your result. Rgds. Dason
Electronics Forum | Mon Jan 17 04:25:50 EST 2000 | Wolfgang Busko
PC: I guess you talk about something called tombstoning. About causes and adequate countermeasures you will find enough material when you browse the archive with this search item. Try also "tombstone". Good luck Wolfgang
Electronics Forum | Tue Sep 14 05:59:16 EDT 1999 | Edmund Loh
Can anyone out there pls enlighten me on how to solve chip tombstone defects. I am running a board with a lot of 0603 chip. i had fine the profile and the alignment, but it still happen randomly on the board itself. Is there any other way to solve t
Electronics Forum | Tue Sep 14 04:56:43 EDT 1999 | Edmund Loh
I am running a board with a lot of 0603 chips ans i'm experience tombstone problem randomly on the board itself. Can anyone out there pls give me advice on how to solve this problem. Thank You.... Rdgs...
