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September 2010

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Subject:
From:
Bob Landman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bob Landman <[log in to unmask]>
Date:
Wed, 8 Sep 2010 15:00:07 -0600
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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




On Aug 26, 2010, at 2PM, Genny Gibbard wrote:

> We use a semi-intelligent internal PN system.  To date, our resistors
> are usually 5% or 1%.  For 5%, we use 2 sig digits plus a multiplier
> digit for the value, plus a letter code to indicate size.  For 1%, we
> use 3 sig digits plus a multiplier plus the letter code.  
> We now have a requirement to make some 0.1% resistor part numbers.  We
> are struggling with how to define it in our system.  The thought was to
> do 4 digits plus a multiplier, but to add to the confusion, the parts
> are 1K and 2K21.  This would mean the PN would have a number like 10000
> for 1K and 22100 for 2K21.  
> Does anyone have any other ideas?
> 
> Genny 
> 
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