Is ST LM358N a rail to rail opamp? If it is not, can I use LM358N to replace OPA2277 due lower costs?

[Nsacc.1]

..

[Uwe Bonnes]

You have to carefully compare your requirements and the specs. If some design uses an OPA2277, there are probably reason this part was used,

[Nsacc.1]

Ok, understood. But in the opposite side, the OPA2277 would be an upgrade for the LM358N once its specs are similar, and OPA is a premium line?

Tks again.

[Nsacc.1]

And I cannot confirm if the LM358N is a rail to rail opamp or not...

[Uwe Bonnes]

There probably will be things that the LM358N can do that the OPA2277 can not or is not speced for.

[Nsacc.1]

Tks Uwe!

Just to check and compare well, would you let me know if the LM358N is a rail to rail voltage opamp?

Tks!

[Uwe Bonnes]

Read the datasheet carefully yourself. What properities do you expect from a RRIO amplifiers. Do you find specs that fullfill these requirements?

[Nsacc.1]

Hi,

I would like to be sure if they are interchangeable. One of my projects is to upgrade an automotive audio amplifier that currently uses the LM358, in this specific case I would like to know if I can replace it with OPA2277. As the amp uses only one LM358, costs wont be a matter.

Tks

[Ozone]

Reading datasheets is an essential skill.

> Is ST LM358N a rail to rail opamp?

No, it is not.

The datashett doesn't say it.

Output voltage swing is supply voltage minus1.5V, which does not qualify as "rail-to-rail".

[AIM65]

OPA2777 is a précision Opamp, low drift, high gain, low bias, low input offset and it's not rail to rail output nor input. But it has altmost nothing in common with the venerable LM358. It's likely there's a good reason to have choosen such a precision opamp, so do not replace it with LM358.

[Nsacc.1]

Dear AIM65, tks for your reply.

In other side, do you think can I replace the LM358 by an OPA2277? Has the OPA advantages over LM due it is a precision Opamp and LM is not? Looking for the both datasheet, I found that both are low power and its mechanical and electrical parameters are similar. Tks

[AIM65]

Opamp rolling is often hazardous. Thats the usage which drive the choice of the circuit then the parts. If your circuit or the other parts of the circuit are not able to support the characteristic of your OPA you wont encounter any improvement, it may also degrade. Stays on LM358, it's manufactured by ST, not the OPA... :)

If you really wants to play with an alternative part, try NE5532 which is bipolar or TL082 wich is fet input. They're both cheap, and not too unstable.