we have some customers using the ATG flying probe to do this type of work.
please contact them at their office in NH (USA) for more details

On Mon, 7 Dec 1998, CONKNET wrote:

> Successful test of .030 micro-bga's on traditional (bed of nails / grid)
> equipment is reliable and not too difficult to achieve. It does not require
> "double density" grids. It does require good fixture design. Test of 30 mil
> BGA's typically requires 3.75 inch multi-plate fixtures with 12 or 16 mil
> piano wire pins.  Some care needs to be given to the Z axis load created by
> the test pins on thin boards. Although Pin Tilt can approach or exceed 1
> inch, the pad size on BGA's make a big target relative to 15 mil QFP device,
> so targeting is not normally an issue.
>
> Doug Tackett
>
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of Winiarski, Frank
> > Sent: Monday, December 07, 1998 10:55 AM
> > To: [log in to unmask]
> > Subject: [TN] Testing of bare PCB's with microBGA pads
> >
> >
> > Our board supplier is having problems testing one of our board designs
> > which have several .8mm (.031 pitch, .024 pad dia.) 144 pad and .75mm
> > (.029 pitch, .016 pad dia.) 48 pad microBGA devices in the design.
> >
> > They claim that they have to use their Probot flying probe tester, which
> > is very time consuming and very expensive.
> >
> > My question is: Are the microBGA designs too tight to utilize "standard"
> > or even "double" density test  equipment?  With microBGA's becoming so
> > "common" (?) there must be a way to cost effectively 100% net list test
> > bare PCB's.  If not, does anyone see a new/iimproved test technology on
> > the horizon that does allow fast and cheaper testing of these designs,
> > and when will it be available?
> >
> > Thanks.
> >
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