Ed, You are spot on! I have received confirmation from a ferrites manufacturer that the storage temperature is dictated by the packaging (tape and reel). Apparently storage outside the recommended temperature range - if the packaging survives - leads to less reliable soldering. Thank you for all your responses on and off line. Kind regards - Chris
From: [email protected] [mailto:[email protected]]On Behalf Of Price, Ed Sent: 11 November 2005 14:16 To: [email protected] Subject: RE: Ferrite chip beads - Storage v/s operating temperature > -----Original Message----- > From: Chileshe, Chris [ mailto:[email protected]] > Sent: Friday, November 11, 2005 2:42 AM > To: [email protected] > Subject: Ferrite chip beads - Storage v/s operating temperature > > Group, > > The storage temperature of most ferrite chip beads (certainly > all the datasheets I have looked at) specify an operating > temperature range that is much wider than the storage > temperature range. Typically these are -55 to +125°C > operating and -20 to +40°C storage. > > Q1: Why is this so? > > Q2: If I use ferrites in a PCB, is my storage temperature for > the whole product restricted by the storage temperature of > the ferrites? > > Thanx in advance. > > Rgds > > - Chris Chileshe > > Usual disclaimers .. OOO! It may have to do with the packaging. If the chips are tape-reel packaged, then there might be temperature extreme issues with the adhesive or the tape material, not the chips themselves. Ed Price [email protected] WB6WSN NARTE Certified EMC Engineer & Technician Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Is Our Specialty - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
