INA500 1.7V to 5.5V Difference Amplifier Texas Instruments INA500 1.7V to 5.5V Difference Amplifier has an integrated op-amp and matched resistors offering three gain options. The INA500A version offers a gain option of 1, while the INA500B and INA500C versions offer gain options of 0.50 and 0.25, respectively.