Interesting question. Unfortunately all I have is wild speculation. A brief glance at the datasheet shows a bipolar output stage. In general, bipolar passes more current and has higher leakage at elevated temperatures. Into a fixed load, I would expect that to increase slew rate. Part of the problem is that the load and all the other parameters have temperature dependencies as well. The combined effect is very unpredictable. Be fun to build a test fixture and measure it though..... The other thing I noticed in the datasheet is that the part is spec'd to an absolute maximum junction temperature of 125 C. Effectively that means you cannot use it at an ambient temperature of 125 C as it wouldn't be able to dissipate any heat. That may or may not be a problem for you, depending on whether the 125C is a real spec or a "marketing spec". I don't really know your application and design constraints, but a bit of research found this one: http://www.ti.com/product/OPA211-HT Which has a slew rate of 27V / uS and is specified to a high temp of 210 C !!! (holy s*!t) On Tue, Jul 10, 2018 at 7:29 AM, Jason White < whitewaterssoftwareinfo@gmail.com> wrote: > In my current design the operating temperature range is rather large: -55= C > to 125C. > > I am planning on using the LM124DT from ST in an analog PWM circuit. My > design uses a 0.5 to 4.5v triangle wave at 25kHz (required slew rate > 0.2V/us). > > The LM124DT has a "typical" slew rate of 0.4V/us at 25C. A minimum slew > rate is not specified and slew is not specified at other temperatures. > Other manufacturers such as TI don't seem to specify this either. > > I would like to get an intuitive sense of how (or if) slew rate might > change over temperature. Additionally I'd like to get some opinions as to > whether 0.2V/us could be too fast for the LM124. > > Thanks, > Jason White > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=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 .