While Agilent may have obsoleted their low current LEDs, don't fret.
Kingbright, Lumex and Fairchild Semi all have them still.  Just enter your
favorite part # into their cross reference for the lists.  I'm still using
about 10K of the hlmp-17xx a year (Fairchild)and nobody has given me any
heads up about them disappearing yet.

Bill

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Brooke Clarke
> Sent: Tuesday, January 18, 2005 2:03 PM
> To: piclist@mit.edu; William "Chops" Westfield
> Subject: [EE] Low current LEDs - Obsolete?
>
>
> Hi Bill:
>
> For years I've been searching the Jameco catalog for low current
> LEDs, and in Catalog 244 they are stocking units speced for 1 and
> 2 ma.  I have tried using other LEDs at reduced current and so
> far all of them have shut off at the 2 ma level (or they are so
> dim by comparison to a "true" 2 ma LED that it's the same as being off).
> These are all rated at 1 or 2 ma:
> Jameco #	p/n
> 253690CR	HLMP-1700
> 253729CR	HLMP-K150
> 253681CR	HLMP-1790
> 253673CR	HLMP-1719
> 253817CR	HLMP-4700
> 253850CR	HLMP-D150
> 253833CR	HLMP-4740
> 253825CR	HLMP-4719
>
>
> My guess is that Jameco got a good deal on a remainder lot.  It's
> too bad these are not being made any more because for battery
> powered devices the low current LEDs are the way to go.
>
> Have Fun,
>
> Brooke Clarke, N6GCE
> --
> w/Java http://www.PRC68.com
> w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
> http://www.precisionclock.com
>
> Date: Mon, 17 Jan 2005 14:50:27 -0800
> From: William "Chops" Westfield <westfw@mac.com>
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Subject: [EE] Low current LEDs - Obsolete?
> Message-ID: <2E8A6948-68DA-11D9-87CD-000A95E5DF26@mac.com>
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> Message: 29
>
> [with correct tag]
>
> There used to be a bunch of "low current" LEDs (~2mA recomended
> current, IIRC) such as the HLMP-47xx series.  With the advent of
> superbright LEDs, are these essentially obsolete these days?  With
> brightness usually being relatively linear WRT current, an easily
> available 2000mCd (at 20mA) superbright ought to easily outperform
> a 3mCd (at 2mA) "low current" device, right?
>
> Thanks
> Bill W
>
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