Yup, almost word for word exactly the same explanation as Wikipedia and a dozen other web entries on the subject.
>-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Brooks,Bill >Sent: Monday, August 13, 2007 3:04 PM >To: Protel EDA Discussion List >Subject: Re: [PEDA] Black Pad > >You guys are a riot... > >"Black Pad" is a defect of ENIG boards that is a separation of >solder joints formed to the surface of the electroless nickel >underplate. This is commonly attributed to excessive >phosphorous in the electroless nickel (i.e. nickel electroless >bath out of control). However, any kind of nickel >contamination (phosphorous or not) that results in the >failures characterized here, are often reported as "black pad" >failures. > >http://www.empf.org/empfasis/feb04/0204help.htm > > >Bill > > >-----Original Message----- >From: Brian Guralnick [mailto:[EMAIL PROTECTED] >Sent: Monday, August 13, 2007 11:46 AM >To: Protel EDA Discussion List >Subject: Re: [PEDA] Black Pad > >Actually, I once designed a PCB with a choice of TO-220 & DPak >regulators. The +5 output was fed through the TO220's +5 pad >which fed the power-plane which had thermal reliefs. Without >burning out the thermal reliefs, they made just enough heat >generated around them to make the unused TO220 pad black. >Eventually, the thermal reliefs would burn out. > >Brad Velander wrote: >> Brian, >> That must be the black pad condition that follows the vaporized >traces? 8^> >> >> Sincerely, >> Brad Velander >> Senior PCB Designer >> Northern Airborne Technology >> #14 - 1925 Kirschner Road, >> Kelowna, BC, V1Y 4N7. >> tel (250) 763-2232 ext. 225 >> fax (250) 762-3374 >> >> >> -----Original Message----- >> From: Brian Guralnick [mailto:[EMAIL PROTECTED] >> Sent: Monday, August 13, 2007 8:56 AM >> To: Jeff Condit; Protel EDA Discussion List >> Subject: Re: [PEDA] Black Pad >> >> >> Before, or, after powering up of the PCB? >> ____________________ >> Brian Guralnick >> Vergent Technologies Inc. >> 438 Brahms Ave. >> Dollard Des Ormeaux >> Quebec, Canada >> H9G 2S6 >> (514) 624-4003 >> [EMAIL PROTECTED] >> >> >> >> >> ____________________________________________________________ >> You are subscribed to the PEDA discussion forum >> >> To Post messages: >> mailto:[email protected] >> >> Unsubscribe and Other Options: >> http://techservinc.com/mailman/listinfo/peda_techservinc.com >> >> Browse or Search Old Archives (2001-2004): >> http://www.mail-archive.com/[EMAIL PROTECTED] >> >> Browse or Search Current Archives (2004-Current): >> http://www.mail-archive.com/[email protected] >> >> > >-- > >____________________ >Brian Guralnick >Vergent Technologies Inc. >438 Brahms Ave. >Dollard Des Ormeaux >Quebec, Canada >H9G 2S6 >(514) 624-4003 >[EMAIL PROTECTED] > > > >____________________________________________________________ >You are subscribed to the PEDA discussion forum > >To Post messages: >mailto:[email protected] > >Unsubscribe and Other Options: >http://techservinc.com/mailman/listinfo/peda_techservinc.com > >Browse or Search Old Archives (2001-2004): >http://www.mail-archive.com/[EMAIL PROTECTED] > >Browse or Search Current Archives (2004-Current): >http://www.mail-archive.com/[email protected] > > This e-mail transmission and its attachments may contain information from Avtron Manufacturing, Inc. that is proprietary, privileged and/or confidential and is intended exclusively for the person(s) to whom it is addressed. Any use, copying, retention or disclosure by any person other than the intended recipient or the intended recipient's designees is strictly prohibited. If you have received this message in error, please notify the sender immediately by return e-mail and delete all copies. ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[EMAIL PROTECTED] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
