Other Parts Discussed in Thread: OPA4191, , OPA2990, TLV9002, LM358LV, TLV2170, TLV9302
OPA
2137U K ← Difference
■Mass production:
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hello Suzuki-san,
Please provide the full part number and all lines of symbolization on the devices.
Can you share the amplifier circuit so we can review it?
Hello Mr.Ron Michallick,
The common mode could be a big factor. The margin below the V- +3V is not certain or always the same. It may work on one lot of devices and not on another.
The missing character doesn't have to be a "K" but it should be there. The bottom line appears to be one character short.
Where did you purchase the "mass production" devices?
Suzuki-san,
The first 2 characters in the bottom row are [year] and [month].
Due to the missing characters on rows 2 and 3 it can not be 2018 May. However the number of characters in rows 2 and 3 is consistent with 2008 May. I suspect this is old stock. I will confirm with quality team to make sure I am correct.
Regardless there is risk in using any OPA2137 due to the input common mode voltage. The unity gain function of application and the light loads means that many other op amps could drop into this application. Most have better offset voltage for better accuracy. Would you be interest in a few alternate part suggestions.
Suzuki-san,
Because power supply is 5V, I suggest LM358LV or TLV9002 as the low cost solutions. To support more supply voltages, I suggest TLV9302 or TLV2170. The OPA2990 should also work well.
Hi Mr.Ron Michallick,
We will prepare and verify some of the proposed IC.
We would like to resolve this issue once we receive the answers from the quality team.
Thank you for your help.
Suzuki-san,
The top side marking by itself was not enough to determine if this was a real TI 2008 device. Please give the STC or batch# for the affected reel?
I can say this is not a 2018 OPA2137U.
Hi Mr.Ron Michallick,
I checked the purchase route, but the answer was that I don't know the batch number now because I wasn't an authorized distributor.
We apologize for the inconvenience, but it seems that we have no choice but to give up tracking because of what we have found now.
In addition, when I got a part that matches TI marking via DIGIKEY, I found that it works normally, and even an old part works by adding a filter, so I would like to apply this content to jumper clean.
Best regards,
K.Suzuki