Sponsor

SEHO makes production lines smarter
Improve your work flow and reduce manufacturing costs with creative ideas and innovative solutions for automation, board handling and material management.
SEHO Systems GmbH

Sponsor

High-Reliability for Low-Temp Processes
Durafuse® LT low-temp, high-rel solder paste is bismuth-free, reduces warpage in large BGAs, enhances thermal cycling, drop shock reliability and reduces energy use up to 15%.
Indium Corporation

Ask the Experts

February 8, 2010 - Updated
February 8, 2010 - Originally Posted

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?

S. R.

Expert Panel Responses

You may want to check out Photo stencil QFN/BGA Repair tool

Bill Coleman
Vice President Technology, Photo Stencil

For over 18 years, Dr. Coleman has been the vice president of technology for Photo Stencil, working closely with customers to understand their printing requirements. His efforts have resulted in several new stencil products.

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.

Stephanie Nash
Director, Integrated Ideas & Technologies, Inc.

Stephanie Nash is the Director of Technical Services & Marketing for Integrated Ideas & Technologies, Inc., a premier manufacturer of SMT stencils. She has been instrumental in the stencil design and technical support.

Free Newsletter Subscription
Circuitnet is built for professionals who bear the responsibility of looking ahead, imagining the future, and preparing for it.

Insert Your Email Address

Sponsor

Expert Circuit Board Modifications
Need to make an engineering change without replacing your circuit board? Circuit Technology Center provides expert circuit board modifications, including trace changes, jumper wires, and component modifications.
Circuit Technology Center