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OPA177: Need Rail-to-Rail Output device

Francis Jiang
Intellectual 2480 points
Part Number: OPA177
Other Parts Discussed in Thread: OPA191, OPA192, OPA206, OPA196

Tool/software:

Hi Team,

Do we have rail-to-rail output performance device that can Pin2Pin replace OPA177? Customer need this spec to meet system requirement. Thanks in advance.

BRs,

Francis

  • 0
    Guru 297970 points

    The OPA191 and OPA192 are similar, but faster and CMOS. See this comparison.

  • 0
    TI__Prodigy 110 points

    Hey Francis,

    There are many next generation P2P options for OPA177 (SOIC).

    For Rail-to-Rail output performance, please see OPA205 and OPA206. OPA206 includes integrated ±40 input over voltage protection.

    See comparison table below.

    Regards,

    Jack Snyder

    Precision Amplifier Product Marketing Engineer

  • 0 in reply to Jack Snyder
    TI__Intellectual 2480 points

    Hi Jack,

    Thanks for your help. Customer now need rail-to-rail in and out, so maybe the devices clemens mentioned will be more suitable.

    BRs,

    Francis

  • 0 in reply to Clemens Ladisch
    TI__Intellectual 2480 points

    Hi Clemens,

    Thanks for your help, could you please help me further understand the difference between Bipolar and CMOS? It is refer to the output structure, right?

    BRs,

    Francis 

  • 0 in reply to Francis Jiang
    Guru 297970 points

    The architecture refers to all transistors, and this mostly affects the inputs. CMOS devices usually have lower input bias currents and power consumption and somewhat higher noise at the same speed; you see this in the comparison I linked to.

    I do not know what characteristics are important in your application. In general, the differences of the OPA191/2 make them better, but a much faster amplifier might have more ringing at the output.

  • 0 in reply to Clemens Ladisch
    TI__Prodigy 110 points

    Hey Francis,

    Please see our application note for an overview of the different input technologies (CMOS vs Bipolar vs JFET).

    If customer needs RRIO, please suggest OPA191 which is a CMOS input amplifier. Notice the difference in voltage noise between the Bipolar Input Stage (OPA177) and CMOS Input Stage (OPA191). If the offset spec is not required, we also have OPA196 that is the low grade variant at 0.1mV offset voltage. Does 15 nV/√Hz voltage noise at 1kHz meet the customer requirement?

    Regards,

    Jack Snyder

    Product Marketing Engineer | Precision Amplifiers