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# TL081: TL031IP

Part Number: TL081
Other Parts Discussed in Thread: TL061, TL031, TLE2021

Hello

PDIP(8) is used as a replacement for obsolete products.
Initially, we considered TL081IP. but
Regarding the Temperature coefficient of input offset, we calculated it from the answer below and found it to be 150uV/℃@(25-85)℃(MAX), which is too large.
＞TL081 is 18uV/C typical, maximum wouldn't create 15mV of Vos;
I would like to adopt the TLP031IP, but please let me know the following as soon as possible.

(1) Use by attaching a 10kΩ trimmer resistor between the offset and NULL terminals and connecting the tap to -12V. at this time
Does it satisfy ±15mV (TYP)?
(2) In the Input Offset-Voltage Null Circuit of TL061, a 1.5kΩ center resistor is attached to the 100kΩ trimmer resistor.
Are there any major problems when using the TLP031IP with a 10kΩ trimmer resistor and connecting the center tap directly to -12V?
(3) TLP031IP has JFET input, is there anything I should be careful about when using it?
For example, phase, gain margin, open loop gain, minimum gain, ringing due to feedback circuit response delay, etc.

Best regards

Is the supply voltage 24V (+/-12V); TL031AI is factory trimmed at 30V

1) That would allow changing the Vos ; Does "Does it satisfy ±15mV (TYP)?" mean you want a high Vos?

2) TL031 has fairly good Vos; you would only need to set the potentiometer close to center; so the missing resistor should not matter.

3) TL031, TL081 (not H), TL061 are all JFET. Concerns are staying in valid input common mode range, avoid step inputs.

TLE2021 may be a better solution; you have the option to remove potentiometer; this op amp has way better Vos and temperature drift. However input difference voltage is limited.