I have also used the EEM numbers and it worked very well. I added
Military type numbering to the 4 digit number. Example. A well known
thru hole resistor is the RLR07C1002FM; Replace the RLR07 with 4700 and
you get:
4700C1002FM; where the C indicates terminal type, 1002 is of course the
ohmic value (3 significant digits and a multiplier), F is the tolerance
and M is a military failure rate. The 4700 hundred covers "Resistor,
fixed value, film, 1/4 Watt, and size. Other letters can be used for
size or what ever, it you don't want the basic number to cover all of
that. Alternating numbers and letters also helps in reading the number.
There are many military specs, the basic RLR spec is MIL-PRF-39017, with
various "slash" numbers for various types or sizes of resistor.
Capacitors are a bit more difficult because they can have so many
variables, but it can be worked out.
Chet
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman
Sent: Wednesday, September 08, 2010 2:07 PM
To: [log in to unmask]
Subject: Re: [TN] Resistor part numbers
Good idea Chet. I wish we'd done that. I will be updating our
numbering system and when I do,
this will be added. We didn't use letters initially but soon we changed
when we had to deal with
resistors like 0.1 ohms (added the R for the decimal point).
Is there a published listing of the MMM where I can grab a copy?
Bob Landman
H&L Instruments, LLC
On Aug 27, 2010, at 8:20 AM, Harner, Chester wrote:
> 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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