I was still wondering how much difference there would be between a standard 100K 3950 B NTC thermistor and the PT3-25E2-S2 thermistor. So I dug into it a bit.
A standard 100K 3950 B NTC has a standard reference resistance, at 25 ºC, of 100K ohm and a Beta value, calculated between 25 ºC and 50 ºC, of 3950K. B(25/50) = 3950K
Beta values are measure of the sensitivity of the change in resistance to temp or the slope of the temp vs R curve. They are calculated with the resistance measured at two temperatures. Not super accurate for determining temp from resistance, but useful for so such in narrow temperature ranges.
The PT3-25E2-S2 is a NTC thermistor made by Shibaura Electronics Co. From the company catalogue I found that the standard resistance at 25 ºC was 98.64K ohm, essentially 100K ohms. They also gave B (25/85) and (100/200) values of 4066K and 4300K respectively.
Shibaura also provided temp vs resistance data relative to the B(100/200) value. I also looked up data for a typical 100K 3950 thermistor and compared the two from 100-250ºC.
For above 150ºC they seem to be in pretty close in agreement, which is the range for a hot end you would typically be interested in.
I am wondering how 3D Printers are programmed to calculate temperature data. If they are going off a Beta value then I would hope they are using a value that covers the expected use range. Using a 3950 value when it’s calc at (25/50) is going to have a lot more error in the calc value outside that range.
Given all this, I think you probably could indeed use a standard 100K 3950 B NTC thermistor in an A10 hotend.
If I’m getting something wrong please let me know