BGA Underfill Alternative

Back when RoHS was just an idea, one of the big concerns was the fear of mechanical reliability with lead-free BGAs. A lot of study went into the solder mixes and it's now history, but there is still some concern. Especially in hi-shock prone applications. Sometimes I recommend that the engineer go along with the PCB and just hold the BGA on the board with finger pressure. But that's not terribly comfortable if the board is going into space or down in a tunnel or something like that.

More down to earth, underfill is one of the recommended additions to improve the mechanical strength. We recently helped to qualify a new type of BGA underfill. It's actually a little pad that comes in standard SMT tape and reel and is placed with standard SMT machines. No need to deal with messy goo. It's placed on the board around the BGA pad area and the BGA is placed on top of it. During reflow, it all sticks together and works like underfill. Cool!

If you're interested, contact Randy ( or Dave ( for more information.

Duane Benson

Underfill in tape

Underfill on pcb

Underfill under chip


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In some sense the next generation of microdevice innovation depends on the data density used to analyze and design. That all relies on the atomic topological function applied to model the device's materials on the nanoscale or smaller. Femtostructural data on electrons, energy fields, and force fields are the data horizon for state-of-the-art design, and that topological format may be utilized by means of the picoyoctometric, 3D, interactive video atomic model imaging function.
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Those energy data values intersect the sizes of the fundamental physical constants: h, h-bar, delta, nuclear magneton, beta magneton, k (series). They quantize nuclear dynamics by acting as fulcrum particles. The result is the picoyoctometric, 3D, interactive video atomic model data point imaging function, responsive to keyboard input of virtual photon gain events by relativistic, quantized shifts of electron, force, and energy field states and positions.
Images of the h-bar magnetic energy waveparticle of ~175 picoyoctometers are available online at with the complete RQT atomic modeling guide titled The Crystalon Door, copyright TXu1-266-788. TCD conforms to the unopposed motion of disclosure in U.S. District (NM) Court of 04/02/2001 titled The Solution to the Equation of Schrodinger.

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