The OPAx186 has internal phase-reversal protection. Some op amps exhibit a phase reversal when the input is driven beyond the linear common-mode range. This condition is most often encountered in noninverting circuits when the input is driven beyond the specified common-mode voltage range, causing the output to reverse into the opposite rail. The OPAx186 input prevents phase reversal with excessive common-mode voltage. Instead, the output limits into the appropriate rail. Figure 7-1 shows this performance.

Figure 7-1 No Phase Reversal