TL074: PCN Quiescent Current issue

Typical values are not guaranteed.

The new die is identical with the TL074H and will have a lower quiescent current.

Hi Francis, 

Francis Jiang said:

Customer feedback they test that the Iq of TL074IDR from 1.4*4*2pcs=11.2mA to 5.6mA, and it doesn’t shown in the datasheet.

Clemens is correct. The post-PCN TLC74IDR has lower Iq than the pre-PCN op amp. It will not exceed your existing circuit design in quiescent current requirements over temperature. The images below are the revised Iq figures per the datasheet. 

For the old TL074IDR: 2X in TL074 (quad op amps), 11.2mA < Iq < 2.5mA*4*2 = 20mA (worst case over temperature, not 5.6mA) - calculated based on the your attached table. 

If you have other questions, please let me know. 

Best,

Raymond

The PCN is the only official documentation, and it does not specify typical values. If you need documentation whose typical values match the actual device, switch to the TL074H.

Apparently, the specified typical value was measured for the TL071H. The four-channel device can share some circuitry between the amplifiers, so the current per amplifier can be somewhat lower. (Only the min/max values are guaranteed.)

Hi Francis, 

Clemens is correct. The PCN and the datasheet is the official document. 

Francis Jiang said:

Their test result is 5.6mA / 4ch / 2pcs = 0.7mA, and your above table is about 0.96mA.

I do not see the issues. 0.96mA is a typical value and the datasheet did not specify the minimum, and it only specified the maximum. 

For quiescent current, the lower values are better, meaning it consume less power power when the system is in idle and/or operating conditions. So 0.7mA is lower than 0.96mA, and it is well within the typical specification. 

Please clarify what is the real issues here. 

Best,

Raymond

Hi Francis, 

Francis Jiang said:

Customer tested 8pcs and all of them are 0.7mA. Isn't this typical? Do you have the real test data of tl074I Iq on hands?

I understand your customer's concerns. But the quiescent current in 0.7mA did not violate or exceed the product specification. In fact, the lower the quiescent current will be desired in this case.

Please tell me what is the issues. If this is Pass/Fail requirements for quiescent current, it is time to change the Pass/Fail requirements due to the FAB change (see issued PCN). 

If you have other questions, please let me know (you may contact me via WebEx messaging system). 

Best,

Raymond 

Hi Francis, 

I am going to close this inquiry, since we have exchanged email internally. 

Best,

Raymond