OPA177: Need Rail-to-Rail Output device

Francis Jiang

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

9 months ago

0 Clemens Ladisch 9 months ago

Guru 298810 points

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

0 Jack Snyder 9 months ago

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 Francis Jiang 9 months ago in reply to Jack Snyder

TI__Intellectual 2510 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 Francis Jiang 9 months ago in reply to Clemens Ladisch

TI__Intellectual 2510 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 Clemens Ladisch 9 months ago in reply to Francis Jiang

Guru 298810 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 Jack Snyder 9 months ago 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

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OPA177: Need Rail-to-Rail Output device