Re: protection against vibration

On Jun 4, 3:22 am, veeresh <veeres...@xxxxxxxxx> wrote:
Hi,
On one of my PCBs i'm using a heavy IC. It is a 70pin gull wing
package. And, the problem is that the pins are breaking near the IC
package. I don't want to use RTV, as it's difficult to remove. What
best I can do to protect this against vibration tests?

The breaking is often caused by the PCB flexing. During the vibration
test, the vibration may hit a resonant frequency for the PCB. Adding
another attachment point ot the PCB can help.

Placing a rubber foot such that the PCB bumps into it if it deflects,
will often help to damp a resonance.

Changing details of the mounting will often help. Basically, you want
to push the resonant frequency up and increase losses. It matters
less how you do this than that it is done.


.

Relevant Pages

  • Re: ExpressPCB & UK Import Duty
    ... Then we got the 32-bit version of "DOS" Orcad. ... It was OK, handled bigger designs, but had a number of irritating changes that made it seem less than good (mostly to the PCB side of things). ... All of the good aspects the DOS original had were lost, and some things were just so stupid I could not believe them. ... Having tried/demod the PADS package I was impressed, it was easy to create things like the 456-pin BGA in about 4 commands and it supported key-stroks for common things, so I decided on that. ...
    (rec.audio.tubes)
  • Re: 8 bit microcontroller market
    ... Inferior to almost any current PCB design package. ... I.e. how long will it take you to get from idea to the routed PCB. ... It is but you could also get a layout package from them. ... I cannot see a major productivity difference between then and today. ...
    (comp.arch.embedded)
  • Re: protection against vibration
    ... package. ... If by "gull wing" you are referring to this package ... amplitude as the pcb vibrations. ...
    (sci.electronics.design)
  • Re: protection against vibration
    ... package. ... the vibration may hit a resonant frequency for the PCB. ... "Applied Control Theory for Embedded Systems" gives you just what it says. ...
    (sci.electronics.design)
  • Re: Low cost PCB layout (for Macs)
    ... I don't know of any DSP tools on the Mac ... > which is currently a freeware package being created, ... I am looking for low cost PCB layout software. ...
    (comp.arch.embedded)