# Op amp advertised as BW = 105MHz, but GBP is actually 70MHz, what's being spec'd differently?

I just came about an op-amp spec where they say, "the Op-amp X is unity-gain stable with a small-signal unity gain bandwidth of 105MHz.." As you continue to read, it then says, "with a gain-bandwidth product of 70MHz, ...."
What is the difference between these specs? How can its unity gain be specified for two different bandwidths (I understand it says small signal, but I still don't know how I'd use the information). It seems to me the meaningful spec is the 70MHz GBP and the 105MHz is just "specmanship". But, if anyone can explain what they mean by that small signal BW, and how that info is useful, I'd appreciate it. Thank you.

Edit: I didn’t want to malign it, but at your requests, here’s a link to the OPA2810 data sheet. https://www.ti.com/lit/ds/sbos789c/sbos789c.pdf?ts=1605745386167&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FOPA2810

• Include a link to that opamp's datasheet. "Small signal" means that the signal is such that the (undesired) effects of "large" signals are not limiting the performance. One common large signal performance limit is slewing, see: electronics-notes.com/articles/analogue_circuits/…. Nov 18, 2020 at 21:16
• We definitely need a link to the datasheet. The two specs may be under different conditions like supply voltage or load or test circuit. One may be "typical" and the other may be minimum. It could even be an error in the datasheet. Nov 18, 2020 at 21:32
• I believe the point is that GBW=gain times bandwidth only holds true in the dominant pole approximation, i.e. 90 degrees crossover. Open loop gain plot instead (fig. 44) shows phase changing before 0dB modulus, there must be a second pole around. Nov 19, 2020 at 2:02