[SI-LIST] Re: Resistive Leakage Paths
- From: <Aubrey_Sparkman@xxxxxxxx>
- To: <Mark.Randol@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 22 May 2006 10:07:58 -0500
Mark,
It's been a VERY long time since I measured leakage paths; I had hoped
someone with more current knowledge would respond.=20
From my memory, board itself is VERY good. The leakage current was more
related to level of contamination than length of the path, IE distance
between 0402 terminals VS larger package. I don't remember having much
trouble getting the leakage current well below the microAmp range; I was
trying to get the leakage after soldering down to the picoAmp range.
But outside Characterization labs and smoke detector people, who cares
about such small currents? Are you trying to assess the risk in not
cleaning the flux? Some (All?) fluxes will cause long term reliability
problems.
Aubrey Sparkman=20
Enterprise Engineering Signal Integrity Team
Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx=20
(512) 723-3592
The Greatest Pleasure in Life is Doing what People say can't be done...
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Mark Randol
Sent: Monday, May 22, 2006 9:36 AM
To: SI-List
Subject: [SI-LIST] Re: Resistive Leakage Paths
<deafening silence>
Just wondering. Inappropriate question, or just something no one has
dealt with?
--
Mark Randol
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=3D20
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Randol
> Sent: Friday, May 19, 2006 10:40 AM
> To: SI-List
> Subject: [SI-LIST] Resistive Leakage Paths =3D20 Hello Listers, =3D20 =
I=20
>hope this isn't too far off topic, but it is a PCB design=3D20 related =
>question. Not inductance or capacitance parasitics,=3D20 but that =
other
>'lumped passive element'.
>=3D20
> I know when hand soldering these little dears that the=3D20 remaining =
>flux can cause havoc due to the leakage currents. =3D20 What's a=20
>'typical' leakage resistance between the terminals=3D20 on a 0402=20
>package? =3D3D20 =3D20 From what I've seen, just the board itself is=20
>pretty good. =3D20 Ceramic caps are typically pretty good as well. =20
>Assembly=3D20 residues can be 100kohms or less.
>=3D20
> Regards,
> Mark Randol
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=20
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