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OPA2132 Oscillation

Other Parts Discussed in Thread: OPA2132, OPA1688, OPA2192

Hi team,

I use OPA2132 with ±5V supply, but oscillates.. with 3M+ Hz frequency. Rf =2.5k, Rb=400k. Power is filtered by caps and bead.

I remove the Rb, it is still oscillating. I reduce Rf as 0ohm, Rb not installed, oscillating...

I reduce the components around it and it can't work. finally, I lift the pins up and make it leave the PCB pads to make parasitic capacitor.  So now the pins VDD, VSS, IN+ are connected on the board, the IN- and OUT1 are up and floating. Then connect IN- and OUT1 with 2.5k resistor. Still oscillating.

I am confused why it oscillates with such small resistor. I try Rf=250k, it stops oscillating. I change to other opamp like OPA2192, OPA1688, it is not oscillating.

Could you kindly help look into it?

Michael