Hi Denny, Some CMs are easier than others, but I've always managed to get them to go = along(for most parts). I always specify at least one manufacturer and corre= sponding part number(s), but I also have "ANY" and "EQUIVALENT P/N" listed.= That way, if they feel uncomfortable substituting, they can go with a spec= part. And they know that if the price isn't good enough, you'll be taking = that job to the CM that gave a better bid. I don't spec ANY for things like inductors, connectors, LEDs, etc. Cheerful regards, Bob ________________________________________ From: piclist-bounces@mit.edu on behalf of Denny = Esterline=20 Sent: Tuesday, July 10, 2018 1:54 PM To: Microcontroller discussion list - Public. Subject: Re: [EE] LM124 Slew Rate vs Temperature? (-55C to 125C) > > > > To save money I always try to specify "any" manufacturer, so my design > needs to allow for wide variations. Lately I've seen ST branded parts bei= ng > used. > > How do you manage to specify that and have board houses actually build it? I have a board house that I've tried doing exactly that with simple passives, and it's always a mess. The last BOM specified "1k ohm 5% tolerance or better, 0805 size resistor - any manufacturer" and it resulted in three calls from them asking if XX was acceptable and eventually them wanting me to authorize it in writing. Turned into a bit of a fight and eventually they claimed that they "have to have a MFG part number, it's part of their ISO requirements". --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .