TL081: TL031IP

Part Number: TL081

Hello Ron Michallick

The reason I'm asking this question is
I am looking for a replacement for another company's 741 that does not require changes to the board pattern or constants.
This is because the UA741CP and LM741CN/NOPB do not satisfy the temperature range, so we are considering whether another type of product can be used.

Best regards

Hello Kadoyama-san, 

Please confirm this is the following pinout you would like to drop in replace: 

Any additional system requirements? 

• Power Supply 
• Expected input/output 

All the best,
Caro

Part Number: TL081

Hello Caro

The pin arrangement is as attached.

Please respond to my question as soon as possible.

Best regards

• Power Supply: t 24V (+/-12V).
• Operating Temperature Range:-20 to +85 ℃

Hello Caro

Thank you for suggesting alternatives.
Other required specifications are as follows.
・Expected input/output：
　VID=±3V(MIN)
　output voltage swing=±6V(MIN)
・Input offset voltage =±6mV(MAX)@25℃
・Temperature coefficient of input offset voltage=±30uV/℃(MAX)
・Input offset voltage adjustment range=±15mV(TYP)
・Offset Nulling Circuit: Diagram below

I'm sorry for asking "Ask a new question" every time.
From now on we will use "Reply".

Best regards

Hello Kadoyama-san, 

I understand now and also understand Ron's response from above, the TL031IP is well within the requirements you have specified above: 

Here is a comparison of the ones I suggested above, as you can see the variable is the gain bandwidth. Could you please share if there are input frequency requirements? Assuming the gain is 2. 

The uA741 has a large resistive drive capability compared to the other ones, is there anything connected to the output of the op amp? resistor/capacitor to gnd? long cable? 

All the best,
Carolina 

Hello Kadoyama-san, 

Thanks for sharing the schematic. I am going to delete it since this is a public forum. 

I encourage you to order samples from the suggestions through your regional sales contact -- if you do not know who this is I can help identify them.

Please test the samples on a prototype board and let us know if they work for the application. I expect them all to work. 
If you run into any issues, try removing C1, C4, and C5. This is a no longer recommended way of filtering the input. 

All the best,
Carolina 

Hello Carolina-san,

Thank you for your reply.
Samples are currently being ordered.
I will try removing C1, C4, and C5 if I have a problem.
However, what I would like to know immediately are the answers to (2) to (5) below.
(especially (2)(3)(5))

(2) I would like to know if it is possible to connect a 10kΩ trimmer resistor to the TL031IP and adjust it within the range of ±15mV (TYP) like the conventional products, UA741CP, and LM741CN.
Please tell me the ΔVIO(adj) (Offset voltage adjustment range) of TL031IP.
(3) Will connecting a 10kΩ trimmer resistor to the TL031IP and adjusting it cause the element to break?
(4) How is ΔVIO(adj) calculated?
(5)In the case of TLP031IP, how much value should I be careful about step input?

Best regards,

Kadoyama

Hello Kadoyama-san, 

Regarding your questions, there is very limited information since these parts are older and the datasheet does not specify. 

I did however find the following thread: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/968257/tl031-offset-adjustment

It says "the TL031 is a "direct upgrade" for the TL061, you can do the offset adjustment like it's done with the TL061"
Therefore I would expect Figure 7-2 to work: 

I do not know the answer to 3 and 4. 
Please reference the following application report: Nulling Input Offset Voltage of Operational Amplifiers

I do not think the calibration is necessary as the TL031 is already within the offset requirements of the application. I would first recommend to test without connecting the potentiometer to offset1 & offset2. 

All the best,
Caro