DS is the correct Ref Des for a lighting device, indicating device, or optical indicator or signaling device...
When they developed the spec we used it for a 'light bulb' or 'Lamp' indicator on a front panel for example.
LED is not specifically called out in the spec but it functions as a lighted indicator.
That being said, a light emitting diode is also a semiconductor or 'diode', which was a 'CR' or 'D' according to ANSI Y32.2.
I would think both are 'correct'. (D also described a vacuum tube Diode)
'D' for Diode takes up the least amount of space on your board... just saying. :)
William Brooks, CID+
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-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Ben Jordan
Sent: Thursday, August 01, 2013 10:00 AM
To: [log in to unmask]
Subject: Re: [DC] Informal Poll
The IPC standard takes the IEEE 315-1975 as the baseline. That's the earliest source I know of which clearly calls for DS.
In the past I have used D, LD, LED.
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