Looking for similar IC to MAX31865 or other solutions

Thread Starter


Joined May 2, 2022
I'm planning to measure temperature with PT100 using 4 wires. So I need stable current source or some nice IC with that, ADC and maybe filters (sinc for 50Hz or just downpass). I have found MAX31865. It has nice resolution but poor accuracy ± 0.5 ° C (?).
Is there any better chip for my purpose or just cheaper? It might be other solution. In my task, I can only use one PT100 4 wired.

I have also found MCP3550, but it seems I cannot build a proper circuit for 4 wired PT100. That chip probably doesn't have compensation for wires.
Thank in advance for any help.