In conventional GAs the two offspring can be part of the individuals in the next generation; however, in the CBGA
one offspring is randomly selected as candidate to substitute an individual of the current population.
The final composition of CBGA
joints after rework using In-containing alloy A is 3.
, this project will help enhance its research quality, organizational performance, and policy engagement.
Figure 3 shows the results of a study on several types of BGAs (a large ceramic column grid array, PBGAs, a medium-sized CBGA
and [U]BGAs) in an exploratory dispense test of a candidate underfill formulation.
This paper presents the SnPb and Pb-free rework development processes developed on these boards, highlighting and analyzing areas of concern caused by reflow issues for adjacent CBGA
parts during [mu]BGA rework, and reduced hole-fill during mini-pot rework activities on DIP16 components.
Both devices are available in a 69-pin, CBGA
The TSOP48, CSP169, CSP208, PBGA256 and CBGA
256 components were evaluated before and after reflow using acoustic microscopy to determine and compare any internal component damage.
The solution required: 1) electrically isolated CBGA
pads; 2) alternative paths for the electrical signals associated with the ball sites; 3) the utilization of standard surface-mount processes and equipment; and 4) that all reliability and performance specifications associated with the product be satisfied.
Sampling today, the VSC3004 and VSC3008 quad and octal signal, 11 Gbps asynchronous switches come in a 69-pin, CBGA
package and consume 1W and 2W, respectively.
Both products have multiple purposes such as fan-out, loop-back, and protection switching; and both come in small 8x8mm, 69-pin CBGA
packages with 500ps latency, for minimal impact when board space and timing budgets are limited.
A previous unpublished evaluation of a CBGA
with a depopulated center array found that depopulating the center degraded the thermal fatigue life.
Production volumes of the 128 Mbit device are available now in 44Ball 8mm x 12mm CBGA
or a 40-pin TSOP type-1.