[SI-LIST] Re: LED with series bead
- From: z46147 <zhuyongfa@xxxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Thu, 08 Nov 2007 11:57:42 +0800
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Steve,
Agree with ESD susceptibility if LED applied to front panel.
Thanks and regards.
Zhuyongfa
HUAWEI TECHNOLOGIES CO.,LTD.
Address: Huawei Industrial Base
Bantian Longgang
Shenzhen 518129, P.R.China
Tel:+86-755-89653025
Fax: +86-755-89650731
E-mail: zhuyongfa@xxxxxxxxxx
www.huawei.com
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----- Original Message -----
From: steve weir
To: zhuyongfa@xxxxxxxxxx
Cc: vijayanand@xxxxxxxxxxxxx ; si-list@xxxxxxxxxxxxx ; lihuafu@xxxxxxxxxx ;
duyumin@xxxxxxxxxx
Sent: Thursday, November 08, 2007 11:46 AM
Subject: Re: [SI-LIST] Re: LED with series bead
Beads sometimes get applied to front panel LEDs, switches and such in
the belief that this will limit EMI radiation and/or ESD
susceptibility. You can decide for yourself if you think, there is a
lot that a ferrite bead is going to do that a 100-300 Ohm current limit
resistor doesn't already do.
Steve.
z46147 wrote:
> Content-type: text/plain; charset=gb2312
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> Hi all,
>
> I also want to know root cause of this application.
>
> Any thought on it would be appreciated.
>
> Best regards.
>
> Zhuyongfa
> HUAWEI TECHNOLOGIES CO.,LTD.
>
>
> Address: Huawei Industrial Base
> Bantian Longgang
> Shenzhen 518129, P.R.China
> Tel:+86-755-89653025
> Fax: +86-755-89650731
> E-mail: zhuyongfa@xxxxxxxxxx
> www.huawei.com
>
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> This e-mail and its attachments contain confidential information from
HUAWEI, which
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> disclosure, reproduction, or dissemination) by persons other than the
intended
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> ----- Original Message -----
> From: Vijay Anand
> To: si-list@xxxxxxxxxxxxx
> Sent: Tuesday, November 06, 2007 6:30 PM
> Subject: [SI-LIST] LED with series bead
>
>
> Dear All,
> In our design we connect a bead in series with LED while driving from an
I/O pin. I dont know why this bead is connected ( still series resistor is
there for current limiting). Is there is any relation with EMI? Kindly do the
needful.
> With Regards,
> Vijay Anand. G
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