The following describes the general methodologies used by BEST for reattaching solder balls to either BGAs or CSPs as part of its BGA rework services. The three methodologies described herein are used by BEST Inc in the reattachment of solder balls to a variety of area array devices. These reballing methods include:
The materials and tools required for each of the methods as well as critical elements of the reballing operation are detailed in the following pages specifically while being outlined more generally in the IPC Rework and Repair Procedures of IPC 7711. The experience BEST has gained in tens of thousands of devices on hundreds of different pattern configurations, body styles and package materials has shaped the information found in these process descriptions. While several device manufacturers do not recommend the reballing of their devices due to the number of thermal cycles the devices themselves have to go through in the reballing process, BEST has successfully attached solder balls to every major device type. One has to take care and be aware of the many potential process pitfallsThis has saved BEST customers from having to spend hundreds of thousands of dollars in component acquisition costs or made available devices which are difficult to obtain in times of allocation thereby allowing the end customer to meet mission critical delivery times. Finally BEST has reballing experience going back to the late 1990’s and can provide a wide array of optional services to meet your process validation or unique production requirements.
BEST Reballing Methods
Each of the reballing methods used by BEST Inc. is equal in its outcome -the precise reattachment of solder balls onto area array devices. We make sure that we properly handle the devices The type of method chosen is determined by several criteria including:
The lead-time requirements of the customer
The customer specification requirements
The volume requirements
The availability of materials for each of the 2,000 plus known grid array patterns including the solder ball diameter and alloy
Reballing Process Flow
BGA Reballing Process Overview Plastic Package, Low Volume
The following describes the general methodologies used by BEST for reattaching solder balls to either BGAs or CSPs as part of its BGA rework services. The three methodologies described herein are used by BEST Inc in the reattachment of solder balls to a variety of area array devices. These reballing methods include:
