CD4049UB Alternatives
- Thread starter mojotron
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StephenGiles
Well-known member
A 4009 is a pin for pin replacement - but no doubt their are internal differences.
Stephen
Stephen
bcarso
Well-known member
[quote author="mojotron"]I don't have any CD4049UB ICs, And I used a 14049U as an alternative without the best or results in a distortion circuit.
I'm wondering if anyone has found a good alternative to the CD4049 in a Tube Sound Fuzz kind of circuit?[/quote]
The MC14049 should have the same performance as the CD4049, so you may be having some other problem. But, there are a few cases where the Motorol* (now On Sem*) parts are a bit different (for example different manufacturer's 4016 parts can be markedly different), so maybe there is a slight difference here as well.
The CD4009 requires a second power supply voltage on pin 16 to work. The 4049 leaves that pin unconnected internally so it is a drop-in replacement for most apps. But going the other direction would be unlikely to work.
The salient properties of the 4049 compared to a standard hex inverter are that the input voltage can exceed the power supply a bit nondestructively, and the output can sink 3.3mA down to 0.4V guaranteed, thus can drive two standard TTL loads.
I'm wondering if anyone has found a good alternative to the CD4049 in a Tube Sound Fuzz kind of circuit?[/quote]
The MC14049 should have the same performance as the CD4049, so you may be having some other problem. But, there are a few cases where the Motorol* (now On Sem*) parts are a bit different (for example different manufacturer's 4016 parts can be markedly different), so maybe there is a slight difference here as well.
The CD4009 requires a second power supply voltage on pin 16 to work. The 4049 leaves that pin unconnected internally so it is a drop-in replacement for most apps. But going the other direction would be unlikely to work.
The salient properties of the 4049 compared to a standard hex inverter are that the input voltage can exceed the power supply a bit nondestructively, and the output can sink 3.3mA down to 0.4V guaranteed, thus can drive two standard TTL loads.
[quote author="bcarso"][quote author="mojotron"]I don't have any CD4049UB ICs, And I used a 14049U as an alternative without the best or results in a distortion circuit.
I'm wondering if anyone has found a good alternative to the CD4049 in a Tube Sound Fuzz kind of circuit?[/quote]
The MC14049 should have the same performance as the CD4049, so you may be having some other problem. But, there are a few cases where the Motorol* (now On Sem*) parts are a bit different (for example different manufacturer's 4016 parts can be markedly different), so maybe there is a slight difference here as well.
The CD4009 requires a second power supply voltage on pin 16 to work. The 4049 leaves that pin unconnected internally so it is a drop-in replacement for most apps. But going the other direction would be unlikely to work.
The salient properties of the 4049 compared to a standard hex inverter are that the input voltage can exceed the power supply a bit nondestructively, and the output can sink 3.3mA down to 0.4V guaranteed, thus can drive two standard TTL loads.[/quote]
Thanks for the replies. The circuit with the MC14049 in it just sounds a little off, perhaps I will fiddle with the FET driver for this circuit, but I think I will take a good hard look at the datasheets and see if anything pops out at me.
I'm wondering if anyone has found a good alternative to the CD4049 in a Tube Sound Fuzz kind of circuit?[/quote]
The MC14049 should have the same performance as the CD4049, so you may be having some other problem. But, there are a few cases where the Motorol* (now On Sem*) parts are a bit different (for example different manufacturer's 4016 parts can be markedly different), so maybe there is a slight difference here as well.
The CD4009 requires a second power supply voltage on pin 16 to work. The 4049 leaves that pin unconnected internally so it is a drop-in replacement for most apps. But going the other direction would be unlikely to work.
The salient properties of the 4049 compared to a standard hex inverter are that the input voltage can exceed the power supply a bit nondestructively, and the output can sink 3.3mA down to 0.4V guaranteed, thus can drive two standard TTL loads.[/quote]
Thanks for the replies. The circuit with the MC14049 in it just sounds a little off, perhaps I will fiddle with the FET driver for this circuit, but I think I will take a good hard look at the datasheets and see if anything pops out at me.
When you use C-Mos inverters as cheap-opamps (which I suspect is the case here), you shouldn't expect them to behave the same between different manufacturers (and even batches). After all, they're used far outside their aim...
Jakob E.
Jakob E.
bcarso
Well-known member
[quote author="gyraf"]When you use C-Mos inverters as cheap-opamps (which I suspect is the case here), you shouldn't expect them to behave the same between different manufacturers (and even batches). After all, they're used far outside their aim...
Jakob E.[/quote]
Absolutely agree with Jakob. If you look at the specs of these CMOS parts they are all over the map, still characterized for low power slow logic despite their versatility. I have war stories...
I wouldn't (again following Jakob) even count on parts from the same manufacturer, unless you are ready to buy a bunch more than you need and with different date codes and sort.
Once I designed a music trigger circuit, part of which used some CMOS inverters as ~linear amps, and got it to work a bit better by using a spare inverter as a bias voltage source for the others. But more conservative forces prevailed, which was probably in my best interests although I was disgruntled at the time.
Jakob E.[/quote]
Absolutely agree with Jakob. If you look at the specs of these CMOS parts they are all over the map, still characterized for low power slow logic despite their versatility. I have war stories...
I wouldn't (again following Jakob) even count on parts from the same manufacturer, unless you are ready to buy a bunch more than you need and with different date codes and sort.
Once I designed a music trigger circuit, part of which used some CMOS inverters as ~linear amps, and got it to work a bit better by using a spare inverter as a bias voltage source for the others. But more conservative forces prevailed, which was probably in my best interests although I was disgruntled at the time.
