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
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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