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 > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 > ----------------------------------------------------- > ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------