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converting from 0805's to smaller packages

#2073

converting from 0805's to smaller packages | 5 January, 2001

Is my employer living in a vacuum? Are we the only ones doing this? I can't find anything in the archives on this topic, so forgive me if it's been hashed over before.

Our major chip supplier is giving us less than a year to convert our products over to 0603's from 0805's. Well, we don't HAVE to change over, but we'll feel it dramatically in the pocket book if we don't. Our biggest question is whether or not to go directly to 0402's and force engineering to deal with all the related design issues (wattage driven) now. Going to 0603's would make that part of it a lot easier, but we'd just end up having to go through the whole thing again in 2-3 years, according to our supplier.

What is everyone else doing?

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#2074

Re: converting from 0805's to smaller packages | 5 January, 2001

Currently where I work, we are busy running trials with smaller component sizes. Consumer Electronics is being driven to smaller and smaller products. Just look at the short history of the cell phone. Remeber when they used to look like Army Walkie Talkies (70's - 80's) and Motorola put out the Brick Cell Phone. Because of the demand for the smaller components, vendors are finding less profit in continuing to produce 1206's or 0805's Jumping straight from 0805's to 0402's is a big big jump. IMO you have to get good at placing and manufacturing with 0603's before you can jump to 0402's. Machine placement accuracy and repeatability become a big issue as you go smaller. Are your current machine capable of placing these smaller components? You may have to look at procuring new equipment to go at these smaller parts.

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#2075

Re: converting from 0805's to smaller packages | 6 January, 2001

I don't know the specs. of our MSHII's, as I'm sort of detached from that part of the process, but supposedly they are capable. Panasonic also recommends we buy all new feeders (well, big surprise there), because of the risks involved with retrofitting existing feeders for the shorter feed stroke. We place a few (VERY few) 0603's now and don't have too many problems. The chip shooters are a little short on maintenance, though, and are showing their age (3-5 years, the last couple @ 4 shifts per day).

FWIW, the Panasonic factor service guy told our placement guy that our stencil design (home plate aps.) was bad news because we'd see more tombstones. I told him to worry about getting his machine to place like it's supposed to and I'D worry about stencil design. The NOIVE o' that guy!

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#2076

Re: converting from 0805's to smaller packages | 8 January, 2001

Panasonics are good machines as long as you do the proper and timely PM's they recommend. Plus with my past history and from others that I here, their feeders are some of their biggest down fall. That's typically why they have to introduce new styles with every different machine. I know their Q Type feeders are much better than their K type feeders and I think the MSH/MSR series do use the Q Type, and some of the newer MV's also use the Q type. If Panasonic states that your machines are capable, have them come in and demostrate that capability on your machines. "Show you the Money " If your machines are a little short of maintenance you may then have some part skewing or shifting that may not effect the placement of 0603's but when you get to 0402's your margins for error are smaller. With 0402's, no matter what stencil design aperture you have, if the part is shifted over, it will tombstone.

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Metcal soldering rework

ii-feed SMD Intelligent Feeder