Hi Jason, I've used a lot of LM358 and LM258(industrial temperature version) opamps. = They are basically the dual version of the quad you are describing. To save money I always try to specify "any" manufacturer, so my design need= s to allow for wide variations. Lately I've seen ST branded parts being use= d. The biggest headache for me has always been related to the output stage bei= ng Class B. It can cause huge problems with closed-loop stability. If you h= ave enough power budget, use a pullup or pulldown resistor to force Class A= operation. If not, slow the opamp down with a feedback capacitor that's 10= times bigger than you think you need. And yes, absolutely do not allow the input pins to be driven below the V- p= in, it will cause the output to go high. And also bleed into the other opam= p sections. Best regards, Bob ________________________________________ From: piclist-bounces@mit.edu on behalf of Jason = White=20 Sent: Tuesday, July 10, 2018 11:03 AM To: Microcontroller discussion list - Public. Subject: Re: [EE] LM124 Slew Rate vs Temperature? (-55C to 125C) The LM124 was chosen because it is a "jelly-bean" op amp. (1) it will probably be available in some form the next 30 years (hard requirement) - the bar is set *really* low for a pin compatible replacement to be put in. (2) it is cheap (3) it is rated for -55C operation (4) it is "HV" rated. We are using a 15V supply that may be subject to transients. --=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 .