OP275 Alternative

RICK SIMON

Prodigy 160 points

Other Parts Discussed in Thread: OPA2172

Can anyone recommend a pin-pin compatible dual op amp to the Analog Devices OP275GSZ. The must have key specs are:

1. SOIC-8 packge

2. Low noise (5nV/RootHz) or lower.

3. Audio output driver for 1K or higher loads. Stable driving capacity loads at low gains e.g., +1V/V.

4. Relatively low quiescent current draw e.g, 2ma or less per amplifier.

5. Rail-Rail input or close to it.

Thanks!

over 3 years ago

0 Pradeep Jacob over 3 years ago

TI__Prodigy 190 points

Hi Rick,

Thank you for reaching out! I am going through our portfolio, and I saw that the OPA2172 might work. I have put the device specifications below, however, the noise on this device is 7nV/√Hz.

Part Number	OPA2172
Channel Count	2
Vs Range	4.5V to 36V
GBW (MHz)	10
Slew Rate (V/µs)	10
Vos max @ 25oC (mV)	1
Vos Drift, typ (µV/oC)	0.3
Rail-to-Rail	In to V-, Out
IQ typ (mA)	1.6
VN (nV/√Hz)	7
ISC typ (mA)	75
IBias (typ) (pA)	8
Operating Temperature (°C)	-40 to 125

The other alternatives that I looked into with lower noise were not rail-to-rail. Would this work for your design?

Best Regards,

Pradeep Jacob

0 RICK SIMON over 3 years ago in reply to Pradeep Jacob

Prodigy 160 points

Thanks Pradeep. Yes it is very close to what I am looking for. I do wish the noise spec was a little better.

0 Pradeep Jacob over 3 years ago in reply to RICK SIMON

TI__Prodigy 190 points

Hey Rick,

I am going to loop in Audio to help and see if they have a device that is similar with lower noise.

Best Regards,

Pradeep Jacob

0 Ivan Salazar over 3 years ago in reply to Pradeep Jacob

TI__Guru** 109985 points

Hi Pradeep, Rick,

I'll check out this thread and provide further comments shortly.

Best regards,
-Ivan Salazar
Applications Engineer

0 Ivan Salazar over 3 years ago in reply to Ivan Salazar

TI__Guru** 109985 points

Rick,

You may check our portfolio here: https://www.ti.com/amplifier-circuit/op-amps/audio/products.html#p7typ=1.1;3&p480=2;2

Perhaps OPA1622 could be an option.

Best regards,
-Ivan Salazar
Applications Engineer

Audio

Audio forum

OP275 Alternative