Category:PCB Assembly Solder Paste

Group Administrators: 1 | Group Member: 192 | Group Threads: 219

Solder paste is a material used in the manufacture of printed circuit boards to connect surface mount components to pads on the board. It is also possible to solder through hole pin in paste components by print solder paste in/over the holes.

Thread Reply
solder question on crystal Reply 2017-02-02 16:35:50
323 views
4 comments
17 likes

bobsled2010

Leave A Message

Follow

We are installing via reflow soldering a crystal that has 2 pads, 1 each end. They are flat pads on the bottom of the part with a small area of the pad looping around and up the side of the crystal on the end. Inspection of the cyrstal under a 40X microscope after reflow show a good solder joint with a proper fillet on the end where the pad is exposed. However, our EMS customer says a few do not work until they reflow the joints on both ends of the crystal with a soldering iron tip.
Does anyone have experience with this type of package? I have attached the data sheet showing the crystal and recommended pcb pad layout which is being used. Any ideas as to why some of them don't work unitl they are reflowed again with a iron? All other solder joints on the board look (and electrically test) good so I believe our reflow profile is correct for this board. We are using lead free solder.
17 likes
Statement: This post is only the personal view of the author and does not represent the opinions of ALLPCB.com.

John

Leave A Message

Follow

This post is perfect for what I need. Thanks!

David Russell

Leave A Message

Follow

The article has really peaked my interest.Hope you can write again soon.

Paul Cunnane

Leave A Message

Follow

Pretty good and useful info for beginners.

Eric Flores Solis

Leave A Message

Follow

Marvelous!
ThreadReply