|Ask the Experts|
February 8, 2010
Leadless Component Hand Soldering Help
We are seeing an increase in the use of leadless components on our assemblies, including many 20 lead ceramic leadless chip carriers. Can you offer suggestions and tips for hand soldering these types of components?
|Expert Panel Responses|
Leadless devices can bridge without proper stencil design. There is a design formula used to determine proper deposition to wet the pad, create a good joint, and avoid bridging. Once rework becomes necessary, there are two ways to deposit paste. Print the board or print the component. For printing the board, a small stencil could be made to clear neighboring devices that have already been loaded. This method has some challenges, such as registration issues and squeegee room. The simplest method would be to use a component printing fixture and stencil to deposit paste on the component leads (similar to a BGA re-balling fixture). Then, place the component and reflow.
Integrated Ideas & Technologies, Inc.
You may want to check out Photo stencil QFN/BGA Repair tool
Vice President Technology
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