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September 2010

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Subject:
From:
"Upton, Shawn" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Upton, Shawn
Date:
Thu, 9 Sep 2010 07:51:07 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (99 lines)
Ditto.

Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
[log in to unmask]
603.626.2429/fax: 603.641.5336

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Thursday, September 09, 2010 7:51 AM
To: [log in to unmask]
Subject: Re: [TN] Resistor part numbers

I too would like the file.  It would be a great resource to have.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Wednesday, September 08, 2010 4:17 PM
To: [log in to unmask]
Subject: Re: [TN] Resistor part numbers

Bob,

 Yes, I would like to see the list.

 Yes, XXXX-YYYY gives you a lot of numbers but that is a lot different
XXXX
types to remember and you could have a lot of YYYY to search through.
You
could use YYYY for the value but that can be difficult for 1% parts when
the
range of values is .001 Ohm to 100Meg Ohm.

 I have seen some folks use XXX-YYY-ZZZ to narrow the ranges but I am
not
sure it works any better.

 One place I worked used "Commodity Codes" as a secondary index. The
main
part number was a "Almost Random" 9 digit number but parts also had a
commodity code. We could look for a part (micro film reader days) by
this
code as one set of microfilm was sorted by commodity code.

Thanks,
Bob Kondner

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman
Sent: Wednesday, September 08, 2010 5:00 PM
To: [log in to unmask]
Subject: Re: [TN] Resistor part numbers

When I was at HP we used a XXXX-YYYY numbering system so when I started
my
own company I wanted something similar.
We use a modified EEM numbering system  (based on the numbering system
in
the Electronic Engineering Master catalog.  

Resistors begin with the 47 series so, for example the 4700 series is "
Resistors, Carbon Film, 1/8W 5%" 
The 4701 series is "Resistors, Carbon Film, 1/4W 5%, etc...

We have 4700-0000 to 4799-9999.  This gives us enough numbers, we
believe,
for any possible resistor type including potentiometers and networks.  

I can send you the entire list as a PDF or Excel spreadsheet if you'd
like
to take a look.

Bob Landman
H&L Instruments, LLC



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