I'm designing a precision voltage reference for an ADC. Aim is to sample 230v rms AC signal using built in ADC available inside STM32F411. Opamp based differential amplifier is used to convert 325v peak to peak waveform to 1.5v peak to peak waveform. Positive bias of 1.66V needs to be provided to the differential amplifier(since I dont want to incorporate negative supply just for ADC).

To generate 1.66v reference I'm using the following circuit.

I would like to know if the following circuit is reliable enough to use as a voltage sensing element for a high voltage inverter system?

(I could've used TLV431 instead of TL431. But availability and cost of TLV431 constrain me to stay with TL431  )

I'm designing a precision voltage reference for an ADC.

The aim is to sample a 230 Vrms AC signal using the STM32F411 built-in ADC. An opamp-based differential amplifier is used to convert a 325 V peak-to-peak waveform to a 1.5 V peak-to-peak waveform. A positive bias of 1.66 V needs to be provided to the differential amplifier, since I don't want to incorporate a negative supply just for the ADC.

To generate a 1.66 V reference, I'm using the following circuit.

I would like to know if that following circuit is reliable enough to use as a voltage sensing element for a high-voltage inverter system?

(I could've used a TLV431 instead of a TL431. But availability and cost of TLV431 constrain me to stay with the TL431.)