The Military part number system has provided this kind of part number
for more years than I care to admit to: and most manufactures use
similar type part numbers, all using the Military codes for tolerance:
T=.01%, A = .05%, B = 0.1%, D = 0.5%, F = 1.0%, g = 2.0% and J=5.0%.
I have set up PN systems for several companies and all were based on the
Military/Manufacturer Model and seem to work well. The part number is
readable, can put parts together on the shelves etc.
Chet Harner
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Thursday, August 26, 2010 3:21 PM
To: [log in to unmask]
Subject: Re: [TN] Resistor part numbers
Consider using a log scale for the numeric value unless it needs to be
human
readable.
Bob Kondner
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Thursday, August 26, 2010 4:38 PM
To: [log in to unmask]
Subject: Re: [TN] Resistor part numbers
I appreciate that there are possibly better ways to do things. There
are both pros and cons to the way we choose. Right now we are not
looking to change our PN system. That is a huge project in itself, and
would take months and $$$ to implement. At the moment our system works
and has worked for this company for over 20 years.
I am just looking for some quick and dirty ideas how someone else with a
similar PN system might choose or has chosen to name a PN for 0.1%
precision.
-----Original Message-----
From: Robert Kondner [mailto:[log in to unmask]]
Sent: August 26, 2010 2:32 PM
To: 'TechNet E-Mail Forum'; Genny Gibbard
Subject: RE: [TN] Resistor part numbers
Genny,
I have lived and breathed this part number stuff for about 20 years.
I would bet your immediate reason for using a semi-intelligent part
number system is so you can find things. Most apps give you a big list
and you need to run down that list finding something.
The second main use for the part number is having a unique ID that
allows a specific part with specific characteristics to be specified in
a list(BOM).
What folk do is merge these two requirements into a single
semi-intelligent part number. Problem is that naming system eventually
needs to be reorganized but since the part numbers are in use you are
stuck. With two people doing the "Naming" things also can run amuck.
It does not have to be this way. What you can do depends on what
existing data system you have in place and how far outside the box you
are willing to go.
Contact me off line bob <funny a in circle> kondner period com
Thanks,
Bob Kondner
410-821-1315
Index Designs
Baltimore Maryland USA 21286
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Thursday, August 26, 2010 4:04 PM
To: [log in to unmask]
Subject: [TN] Resistor part numbers
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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