Low Voltage OP Amp similiar to OPA2134

danville · 31st October 2005, 06:12 PM

The OPA-2134 is a very good OP Amp that works well with a +5V supply. Currently this part is hard to buy (in SO-8).

Can anyone suggest a similar part? It needs to work with a 5V supply but does not need to be rail-to-rail (the OPA-2143 is not rail-to-rail). Ideally it should have low noise and reasonable bandwidth.

skyskraper · 1st November 2005, 07:06 AM

would the OPA2132U work for you? it is pricier but is in stock at Digikey

bocka · 1st November 2005, 08:09 AM

What about the OPA(2)343/(2)353?

danville · 1st November 2005, 01:47 PM

Thank you for the suggestions.

The OPA2132U or UA will certainly work but it is expensive for my application.

The OPA2353, like most CMOS rail to rail parts has excessive 1/f noise. I think the AD8606 or newer AD8656 is probably a better choice for low voltage rail to rail requirements.

There are very few op amps that will give good performance with a 5V supply (and none to my knowledge that work great). The OPA2132 looks fairly good on paper. I use this part for antiimagining filters for D/A. In general, you want a Gain-Bandwidth Product of at least 100x the sample rate for this situation.

nuvistor · 3rd November 2005, 08:27 PM

Hmm... is bipolar input OK? if OPA2132 is too expensive then perhaps you could use MC33178, <$1 at Digikey. Output is spec'd at +/- 2.5V rails, 600ohm load. En about the same, In higher due to bipolar input but pretty good at 0.15pA/rtHz @ 1kHz, noise Req of 50k. SR and GBW are lower though, guaranteed minimum of 1.2V/us, 2.5MHz may not be good enough for you.

NJM2115 is even cheaper at less than $0.20 at Mouser (unfortunately only DIP is in stock), output also spec'd at +/- 2.5V, 2k load, typical 4V/us, 12MHz. Input noise appears similar to MC33178.

nuvistor · 3rd November 2005, 09:02 PM

TI TLV2362 is similar to NJM2115 and about 1/3 the cost of OPA2134 at Digikey, LMV721 is similar at higher cost.

danville · 3rd November 2005, 09:35 PM

I am familiar with the MC33178. I think Cirrus (back when they were Crystal), used them in some of their reference designs.
I wish they were a little higher bandwidth. I may have to take a closer look at this part. Does anyone have any experience with it?

The LMV721 is not available in SO-8

The TLV2362 is somewhat noisy at low frequency and seem to have a lot of THD. I haven't ever tried this part.

Thanks for the suggestions.

nuvistor · 3rd November 2005, 11:27 PM

LMV722 is dual version of LMV721, available in SO-8, cost about 80% of OPA2134.

MC33077 is a wider bandwidth version of MC33178 with lower THD curves and higher Ib, In, datasheet curves show output swing at +/-2.5V, 2k load. MC33078 bandwidth is inbetween, similar THD to MC33077, no +/-2.5V data, is used in Lynxone, its 1kHz loopback THD is less than 0.003%.

TLV2362 and OPA2132 datasheets have similar En curves. TLV2362 THD curves are higher than OPA2132 but lower than MC33178 and are taken at +/-2.5V rails.

Looks like you have some research and evaluation to do.

Dominique · 3rd November 2005, 11:44 PM

have tried the MC33078 (though from TI) and it worked fine at 6V.

danville · 4th November 2005, 12:06 AM

I want to thank everyone for their comments.

I still like the OPA2134 best, but I think I need to evaluate a few new parts.

Life is so much easier when you have higher (and bipolar) power supply rails.

Al Clark

31st October 2005, 06:12 PM	#1
danville diyAudio Member Join Date: Jun 2004 Location: Minnesota	Low Voltage OP Amp similiar to OPA2134 The OPA-2134 is a very good OP Amp that works well with a +5V supply. Currently this part is hard to buy (in SO-8). Can anyone suggest a similar part? It needs to work with a 5V supply but does not need to be rail-to-rail (the OPA-2143 is not rail-to-rail). Ideally it should have low noise and reasonable bandwidth.

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1st November 2005, 07:06 AM	#2
skyskraper diyAudio Member Join Date: Dec 2004 Location: perth	would the OPA2132U work for you? it is pricier but is in stock at Digikey

1st November 2005, 08:09 AM	#3
bocka diyAudio Member Join Date: Jul 2003 Location: Hannover	What about the OPA(2)343/(2)353?

1st November 2005, 01:47 PM	#4
danville diyAudio Member Join Date: Jun 2004 Location: Minnesota	Thank you for the suggestions. The OPA2132U or UA will certainly work but it is expensive for my application. The OPA2353, like most CMOS rail to rail parts has excessive 1/f noise. I think the AD8606 or newer AD8656 is probably a better choice for low voltage rail to rail requirements. There are very few op amps that will give good performance with a 5V supply (and none to my knowledge that work great). The OPA2132 looks fairly good on paper. I use this part for antiimagining filters for D/A. In general, you want a Gain-Bandwidth Product of at least 100x the sample rate for this situation.

3rd November 2005, 08:27 PM	#5
nuvistor diyAudio Member Join Date: Jun 2004 Location: Richmond CA	Hmm... is bipolar input OK? if OPA2132 is too expensive then perhaps you could use MC33178, <$1 at Digikey. Output is spec'd at +/- 2.5V rails, 600ohm load. En about the same, In higher due to bipolar input but pretty good at 0.15pA/rtHz @ 1kHz, noise Req of 50k. SR and GBW are lower though, guaranteed minimum of 1.2V/us, 2.5MHz may not be good enough for you. NJM2115 is even cheaper at less than $0.20 at Mouser (unfortunately only DIP is in stock), output also spec'd at +/- 2.5V, 2k load, typical 4V/us, 12MHz. Input noise appears similar to MC33178.

3rd November 2005, 09:02 PM	#6
nuvistor diyAudio Member Join Date: Jun 2004 Location: Richmond CA	TI TLV2362 is similar to NJM2115 and about 1/3 the cost of OPA2134 at Digikey, LMV721 is similar at higher cost.

3rd November 2005, 09:35 PM	#7
danville diyAudio Member Join Date: Jun 2004 Location: Minnesota	I am familiar with the MC33178. I think Cirrus (back when they were Crystal), used them in some of their reference designs. I wish they were a little higher bandwidth. I may have to take a closer look at this part. Does anyone have any experience with it? The LMV721 is not available in SO-8 The TLV2362 is somewhat noisy at low frequency and seem to have a lot of THD. I haven't ever tried this part. Thanks for the suggestions.

3rd November 2005, 11:27 PM	#8
nuvistor diyAudio Member Join Date: Jun 2004 Location: Richmond CA	LMV722 is dual version of LMV721, available in SO-8, cost about 80% of OPA2134. MC33077 is a wider bandwidth version of MC33178 with lower THD curves and higher Ib, In, datasheet curves show output swing at +/-2.5V, 2k load. MC33078 bandwidth is inbetween, similar THD to MC33077, no +/-2.5V data, is used in Lynxone, its 1kHz loopback THD is less than 0.003%. TLV2362 and OPA2132 datasheets have similar En curves. TLV2362 THD curves are higher than OPA2132 but lower than MC33178 and are taken at +/-2.5V rails. Looks like you have some research and evaluation to do.

3rd November 2005, 11:44 PM	#9
Dominique diyAudio Member Join Date: Jul 2004 Location: Berlin	have tried the MC33078 (though from TI) and it worked fine at 6V.

4th November 2005, 12:06 AM	#10
danville diyAudio Member Join Date: Jun 2004 Location: Minnesota	I want to thank everyone for their comments. I still like the OPA2134 best, but I think I need to evaluate a few new parts. Life is so much easier when you have higher (and bipolar) power supply rails. Al Clark

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