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Bga Reball Rework Vs
Tired of having to reball components more than once because of sloppy flux or ball alignment? ACCURATELY REBALL YOUR OWN COMPONENTS IN-HOUSE with HEPCO’s Model 9000 BGA SOLDER SPHERE PLACEMENT SYSTEM. Our self-contained desktop system uses vacuum and custom tooling to place an entire Ball Grid Array at once.
|Ask the Experts|
| September 14, 2020 |
Options for Reballing BGA Components
Which of the following do you recommend when reballing BGA components?
Reballing with solder paste and solder spheres, or with solder spheres only?
Would you change the process depending on the size of the BGA component or number of balls?
|Expert Panel Responses|
The appropriatere-balling process to follow is dependent on the BGA package. If you are re-balling a eutectic or lead-free BGA package then using a tacky flux along with the specified alloy solder sphere is the most common approach.
However if the BGA package requires a high temperature solder sphere then applying eutectic solder paste through the use of a stencil, and then placing the high temperature solder sphere may be recommended. The re-balling profile temperature will allow thee utectic solder to reflow and attach the high temperature sphere to the component pad.
We have been successfully reballing BGA devices for years in accordance with IPC 7711 procedure 5.7.3 BGA Reballing Procedure, Fixture Method Flux Only. Our experience would indicate there is no need to change the process with a change in ball size or ball count.
Circuit Technology Center
Mr. Vigneau has been a key member of the team at Circuit Technology Center since 2008. He has vast expertise, experience and understanding of complex circuit board rework, repair and modification operations. He is one of the most knowledgeable experts in this area across the globe.
I would re-ball using spheres and tacky flux. I would not use paste. There are two main reasons for this:
- The variability in paste volume will contribute to variability in the final sphere volume, and therefore in size.
- The paste will create additional voiding by incorporating flux volatiles into the final sphere. A tacky-flux based process will not do so
Fritz's career in electronics manufacturing has included diverse engineering roles including PWB fabrication, thick film print & fire, SMT and wave/selective solder process engineering, and electronics materials development and marketing. Fritz's educational background is in mechanical engineering with an emphasis on materials science. Design of Experiments (DoE) techniques have been an area of independent study. Fritz has published over a dozen papers at various industry conferences.
I would recommend re-balling by applying flux first then solder balls. No need to change process depending on ball size.
Vice President Technology
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.
IPC-7711 'Rework, Modification, and Repair of Electronic Assemblies' has several procedures which all indicate that you should use flux and solder spheres to reball the BGA.
Take a look at the latest BGA reballing procedure to be added to the document, procedure 5.7.6 (attached). You'll see that this procedure uses a polyimide ball carrier that matches the layout of the BGA. Simply clean the BGA, Flux the component,align the polyimide carrier and then reflow.
There are several other methods in the guidelines which would be helpful in your situation.
Manager of Assembly Technology
Kris Roberson has experience as a machine operator, machine and engineering technician and process engineer for companies including Motorola, and US Robotics. Kris is certified as an Master Instructor in IPC-7711 / 7721, IPC A-610 and IPC J-STD 001.
There are a number of viable methods available for reballing BGAs and other area array devices. Ball count, pitch, diameter, alloy and package size are all considerations.
One preferred method that satisfies most reballing applications is the use of flux with a mask (stencil) to accurately position replacement solder spheres onto a package and then reflow in a controlled environment, such as a stand-alone Mini Oven.
Typically an air environment is used, however reballing with an inert environment is gaining popularity,especially reballing smaller devices. Occasionally solder paste is used instead of flux when criteria necessitates increased interconnect solder volumes.
Regional Sales Manager
Al Cabral is Regional Sales Manager for Finetech and Martin rework products. His expertise includes through-hole, surface mount and semiconductor packaging with an emphasis on soldering and heat transfer. Al has been a significant contributor to the development and optimization of reflow and rework processes and systems, particularly lead-free transitions and microelectronic applications.
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- BGA rework technicians must be fully trained, their skills practiced and developed. They must understand the materials they're working with, the tools, the process steps, and the interrelationship of all factors. They must have the skills to evaluate and 'size up' a BGA rework situation knowledgeably and skillfully before commencing rework.
BGA Reballing - Tired of paying someone to pay operators to soak your expensive components in water & scrub off the burned paper/flux? Tired of having to reball components more than once because of sloppy flux or ball alignment? ACCURATELY REBALL YOUR OWN COMPONENTS IN-HOUSE with HEPCO’s Model 9000 BGA SOLDER SPHERE PLACEMENT SYSTEM. Our self-contained desktop system uses vacuum and custom tooling to place an entire Ball Grid Array at once. Unlike the rice paper/water or the “kid’s game” method using gravity and loose balls, our system is the fastest, cleanest, simplest, most accurate method on the market. It’s the only one that uses a clean & correct process similar to the one used to originally create your components - at a fraction of the cost! We can make fixtures to Reball up to 8 components at once, and we can even handle Micro-BGA’s with ball sizes as small as .012” (.3mm)
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