I've had similar issues. The assembly houses are rightfully risk averse o= n these issues. Currently I'm using Aligni to manage that side of things, with specified "E= quivalent" (exact replacement) and "Alternate" (acceptable variation in som= e parameters) parts. It's pretty slick in that Aligni also gives me a variance report on every b= uild, so for any given batch of boards I know exactly what parts go into th= em. That's important. If these things don't work then someone dies. -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of Denny = Esterline Sent: Tuesday, July 10, 2018 2:55 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=20 > needs to allow for wide variations. Lately I've seen ST branded parts=20 > being 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 passive= s, 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 ev= entually 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 numbe= r, it's part of their ISO requirements". -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=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 .