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I have a question regarding the relationship between open-loop-gain and supply voltage. Using op270 as an example:

We need to operate this device at +-5V. The datasheet has a plot (Figure 19) which shows Open-Loop-gain (in units of V/mA??) which decreases linearly as the supply voltage drops (from around 3000 at +-18V to 100 at +-5V). Is this in any way related to the GBP of the device? I'm confused by the V/mA units here.

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It's a typo- it should be V/mV.

See the typical and minimum gains Avo for the different suffixes in the tables.

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