Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Use tl071 instead of ca3140?

Status
Not open for further replies.

betwixt

Super Moderator
Staff member
Joined
Jul 4, 2009
Messages
14,854
Helped
4,853
Reputation
9,724
Reaction score
4,638
Trophy points
1,393
Location
Aberdyfi, West Wales, UK
Activity points
126,435
TL071 incorporates a 200 Ohm resistance in series with it's output pin which limits the current it can sink/source and gives it infinite short circuit protection. It should be able to sink around 40mA in short circuit conditions though. The CA3140 does not have a series resistor, it uses current limiting circuits instead. Otherwise they are both similar "first generation" BiCMOS op amps.

For general applications that don't push the CA3140 to it's limits, they should be interchangeable. You can always add an emitter follower current booster at the output if necessary.

Brian.
 
  • Like
Reactions: neazoi

    neazoi

    Points: 2
    Helpful Answer Positive Rating

Audioguru

Advanced Member level 5
Joined
Jan 19, 2008
Messages
9,209
Helped
2,128
Reputation
4,250
Reaction score
1,955
Trophy points
1,393
Location
Toronto area of Canada
Activity points
57,849
But I cannot find source info for the tl071
It is a very common single audio opamp, it is a TL081 that is selected for low noise. I have the datasheet for the TL072 dual opamp that is common in stereos and it has the spec's for the single, dual and quad versions.
Go to www.datasheetarchive.com where you can select the datasheet from the TI, the inventor manufacturer (with correct spec's) or from a copycat manufacturer (who frequently has errors in the spec's).

The input of the CA3140 works all the way down to ground in those circuits, the inputs of the TL071 work well down to about +3V or +4V but if the inputs go lower then the output suddenly goes high (phase reversal problem).
The output of the TL071 might not go low enough to turn off the relay.
 
  • Like
Reactions: neazoi

    neazoi

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top