LM385-1.2: Part Number Clarification

Part Number: LM385-1.2

Hi,

We are using the LM385MX-1.2 SOIC8 Package in few of our designs.

I would like to help us with the below query..

What's the difference between 

1. LM385M-1.2/NOPB

2. LM385M-1.2

3. LM385MX-1.2/NOPB

Is any of the above made Obsolete and if so what will be the alternate part.

Thanks.