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LMP8278Q-Q1: about input bias current

Paul Kim
Intellectual 1430 points
Part Number: LMP8278Q-Q1

Hi team

LMP8278Q-Q1 D/S say Input bias current = around 140uA at Vcm = 20V on Figure 4.

so total input bias current would be Max 280uA(= 140uA x 2) for two input pins ?

further, may I know total input bias current for  two input pins at Vs = 0V and common mode voltage = 20V ?


  • 0
    TI__Genius 17100 points
    Hi Paul,

    Your calculation of max input bias current is correct: unless explicitly stated, the datasheet Ib curves represent the bias current of each pin so they should be doubled to estimate for both.

    The LMP8278Q-Q1 is an older device, so we do not have explicit data for Ib when Vs = 0, but the current will either be similar to when powered or less depending on whether or not there are internal switches.


    Thank you for choosing TI parts,
    Manuel Chavez