On Fri, 18 Feb 2011 18:46:53 -0500, "Charles"
wrote:

http://www.electronics-radio.com/art..._numbering.php

Hard to decipher some semiconductor part numbers, these days.

1N, 2N, 3N devices are well defined but 4N and 5N and 6N parts were never?
defined. Does anybody out there actually know if the old JEDEC standard was
dropped, or usurped, or has it just faded into the past? I cannot find a
JEDEC reference to a 6Nxxx optocoupler.

The type designations are controlled by the JEDEC under document
JESD270B which tracks ANSI/EIA-370-B-1992. You can get a copy at:
http://www.jedec.org/standards-documents/docs/jesd-370b
but you'll need to register and login.

Section 1a mumbles something about the first digit, minus 1, equals
the number of useful electrical connections (which do not include the
case shield connection). So, if your device has a half dozen
electrical connections, it would be a 5Nxxxx.

Good luck decoding the rest of the document. If there were some
slip-ups in device classification, my guess(tm) is that it was because
nobody could understand the document.

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