[SI-LIST] Re: ESD strips on board edge
- From: steve weir <weirsi@xxxxxxxxxx>
- To: davidjp@xxxxxxx, <koh-yew.thoon@xxxxxx>, "SI-List" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 04 Aug 2005 08:18:40 -0700
Dr. Pommerenke, one additional note: It is important to maintain
dielectric sufficient separation between an ESD strip and any other PCB
features so that a secondary arc doesn't bypass the ferrite. Surface
contamination can be a problem.
Regards,
Steve.
At 10:01 AM 8/4/2005 -0500, Pommerenke, David wrote:
>Koh,
>
>In general, those strips are placed as landing area for sparks that hit
>the edge of the board. Sparks can hit the edge of the board in two-part
>plastic enclosures or during handling. However, during handling other
>parts can be hit to.
>
>If you are working with a two-piece plastic enclosure, then it might be
>a good idea to have an ESD strip on the board edge. The strip should be
>connected to your "ground". I suggest to avoid a direct connection, but
>to use a ferrite bead (e.g., 300 Ohm at 100MHz). The bead will survive
>the ESD current, but it reduces the current amplitude and increases the
>rise time. The fact that it will go into saturation is not that
>critical, tests have shown that it stays somewhat efficient in reducing
>the current peak amplitude and increasing the rise time. A resistor
>(e.g., 1000 Ohm) would be an alternative, but most resistors will be
>destroyed by the ESD current.
>
>Dr. David Pommerenke
>EMC laboratory
>University Missouri Rolla
>www.emclab.umr.edu
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Thoon, Koh Yew
>Sent: Thursday, August 04, 2005 1:13 AM
>To: SI-List
>Subject: [SI-LIST] ESD strips on board edge
>
>=3D20
>Hi folks,=3D20
>
>I wonder if there's any good documents on implemenation of ESD strips
>for Board edge.
>
>Thanks
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