No choice. The very low power SDRAMS have very small packages. You know, for PDAs & other ridiculously compact devices. Thankfully, there are only 54 contacts, not something like 500-1000...
____________ Brian Guralnick [EMAIL PROTECTED] Voice (514) 624-4003 Fax (514) 624-3631 ----- Original Message ----- From: "Dennis Saputelli" <[EMAIL PROTECTED]> To: "Protel EDA Forum" <[EMAIL PROTECTED]> Sent: Monday, September 09, 2002 1:54 PM Subject: Re: [PEDA] BGA Footprint question. > that's pretty small! > i would talk to your assembler, i have found that different ones have > different opinions > > Dennis Saputelli > > > Brian Guralnick wrote: > > > > Hi everyone, > > > > I'm making a 54-BALL VFBGA (8mm x 9mm) package. From a Micron ram chip >MT48V8M16LFFF. > > > > PDF = http://download.micron.com/pdf/datasheets/dram/MobileY95W_3V_E.pdf > > > > In the mechanical package description, it says: > > > > 54x /O 0.35 solder ball diameter to post reflow condition. The pre-reflow >diameter is /O 0.33. > > > > Elsewhere, the spec says that the Solder ball pad: /O .27mm. > > > > This is all that we are told with regard to the pad size. > > Does this mean that the land pattern should be 0.33mm, or 0.35mm? > > What should the solder mask & paste stencil be cut out to? > > > > ____________ > > Brian Guralnick > > [EMAIL PROTECTED] > > Voice (514) 624-4003 > > Fax (514) 624-3631 > > > > > ************************************************************************ > * Tracking #: 709F790AA8A5A04AB22D7874AA0F74C836B673FD > * > ************************************************************************ > -- > ___________________________________________________________________________ > www.integratedcontrolsinc.com Integrated Controls, Inc. > tel: 415-647-0480 2851 21st Street > fax: 415-647-3003 San Francisco, CA 94110 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
