I'm looking at an example circuit diagram from ST, and it use sa 48F-01GYDXNL part that I can't find anywhere. It's a gigabit ethernet jack with magnetics, and the datasheet shows a circuit looking like:
Link to the datasheet. I'd like to use a different part, but what I want to know is do I have to have the exact same circuit inside the magnetics ? Is any old RJ45 magjack going to work ? Or is it somewhere between the two ?
The one I'd like to use is 
(datasheet here) which appears sufficiently different to cause me to worry they're not functionally the same.
Best Answer
You can use the 08621JX143-F just make sure the pins with TRD go toward the phy. The 08621JX143-F has one less center tap pin and some LED's. The frequency response might be a little different, but the overall functionality should comply with IEEE ethernet standards.