SN74ABT245B: what's the flip-flop type of this device?

Hello Howard,

The SN74ABT245B is a logic transceiver -- aka a direction controlled buffer. It does not contain any flip flops.  If you're looking for flip flops, I would recommend the parametric search tool on our website:

http://www.ti.com/logic-circuit/flip-flop-latch-register/overview.html 

You might also like this video explaining the naming conventions for standard logic devices:

https://training.ti.com/tlm-bol-partnumber?cu=1134826