Difference in chips?

[THLL]

Hello I have noticed that some of the chips do not work like the others.

What is the difference between a NRF24L01+ 1420JB and NRF24L01+ 1405FJ

[Asbjørn]

We have seen several users here lately that have bought modules with counterfeit nRF24L01+ on them. They report that especially the Auto-ACK functionality is not working on the fake ones. May I ask you from where you got the various chips that you have and what kind of behavior you are seeing that's not according to your expectations?

[THLL]

Sorry to hear that there are counterfeits. I cant really tell what does not work about them, I just started using and learning about these and noticed that the "1405FJ" ones dont even work but when swapped with the "1420JB" it works great.

I bought mine from ebay. www.ebay.com/.../131381406403