**Part Number:**OPA4991-Q1

Hello,

I cannot work out what the difference between the OPA4991TQPWRQ1 and the OPA4991QPWRQ1. The difference is that a T has been added after the 4991. I have been through the whole datasheet multiple times and not seen any explanation about what the difference is.

I'm aware that an added T in the part number is commonly used to distinguish between tape/reel packaging, and this may be the answer, especially as the only mention of the T variant shows up in the order codes section of the datasheet. However, the T is not normally added so early on in the part number and more importantly, each of the 3 times the T variant shows up on the datasheet, it has a line above it without the T which is identical in every way, including the packaging option.

Even the TI order page separates them out but then has every parament exactly matching.

Here are the extracts form the datasheet which imply the packaging is the same. The only difference is the marking on the top changes from O4991Q to O4991T

What am I missing?