We need your help on a component, REF3330DBZ that we are using in one of our products.
In the attached picture below, you can see that because of the 5V pull-up resistor before the inverter, current tries to flow towards the 3V reference voltage(REF3330DBZ) through the forward-bias diode. This opposes the 3V reference voltage which is itself trying to drive current. This is why we see a ~13mA increase in current consumption on average for the whole circuit.
This inverter was assembled by mistake by our PCB assembler. Originally, we specified an inverter that did not have those diodes. But, due to this mistake, there are some devices with this wrong inverter on the market. We are now trying to assess the risks that could result because of this wrong component assembly.
My questions to you are:
1) Will this opposing current on the 3V output, reduce the lifetime of the Voltage Reference IC? If yes, any estimate by how much?
2) Could we expect a component failure or performance reduction over time?
Also attached is the schematic snapshot of the Voltage Reference IC.