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TL071A: TL071A Body Marking Different

Part Number: TL071A

Tool/software:

Hi,

Anyone would be able to help me on identifying the different for TL071A body marking. We used to purchase TL071A with body marking "071A 25M A77S G4" but recently we received new body marking "071AC 38 ASKL". We found that the output pin 6 for the new body marking had slightly higher than the incumbent part that we used. The input voltage that we supplied is around +/- 12VDC and with the incumbent part we shall have output around +7VDC ~ +10VDC. With the new body marking part, we observed the output voltage is ranging between +9VDC to +12VDC. We had done ABA swapped between the body markings and the output measurement was following the part itself.

  

We also made resistance comparison between pins to output pin for these 2 parts and observed different result. We are not sure if this comparison could tell us that the new body marking having different characteristic compared to the incumbent part. So, I'm looking for expert opinion toward our observation here.

Probe to Pin#6 (Output)

Pass (DC: 2234)

 

Fail (DC: 2331)

Pin

IC#1

IC#2

IC#3

 

IC#1

IC#2

IC#3

1

3.029M

3.057M

2.281M

 

OL

OL

OL

2

OL

OL

OL

 

10M

10M

10M

3

OL

OL

OL

 

10M

10M

10M

4

4.160M

4.209M

4.172M

 

6.386M

5.688M

5.730M

5

4.160M

4.200M

4.172M

 

OL

OL

OL

7

5.355M

5.393M

5.669M

 

5.799M

5.799M

5.799M

8

OL

OL

OL

 

OL

OL

OL

 

Thank you in advance.

  • Please show the schematic, and specify the supply voltages and the voltages at both input pins and at the output pin. Are you using this device as an amplifier (with negative feedback) or as a comparator?

  • Here is the schematics snapshot for this part. I cannot disclose all due to IP issue. We used this device as an amplifier. Below are the voltage details for application usage and testing usage.

    For Application:

    Supply voltage = 12V, Input -/+ 12V. Output pin: +2.46V

    For Testing (In-circuit Test Keysight i3070 OpAmp Test):

    Supply voltage = 12V, Input -/+ 100mV. Output= 7v~10V.

    Thanks.

  • Newer TL07x devices use a new die with somewhat different characteristics (among other changes, with rail-to-rail outputs). However, the guaranteed datasheet limits have not changed.

    The circuit appears to be an inverting amplifier with a gain of 0.205. The output of 2.46 V corresponds to an input voltage of −12 V, which is correct.

    The ICT has nothing to do with the schematic. Please specify exactly what this test does; it sounds as if the i3070 tries to force the TL071A to work as a comparator.

    Please note that the datasheet does not specifiy a maximum output voltage, so the fact that the new die goes up to the power rail is allowed. Also, your circuit does not use the TL071A as a comparator, so I doubt that this test done by the i3070 makes sense. Anyway, just change the test to allow anything between 7 V and 12 V.

  • Samli,

    The top marking is a many different parts symbolization change.  It has zero effect on performance. A different PCN changed open loop output performance. Great news, voltage is improved. Change your ICT limits to accept this improvement.