We are profissional RJ45 and Lan transformer manufacture.
OEM and ODM is acceptable for us. 
We could provide the product against to Pulse, Wurth , Epcos....ect.

RJ320012C-LF 

Turn Ratio (±3%) : TX=1CT:1CT   RX=1CT:1CT
Inductance OCL : 350uH MIN  / 100KHz/0.1V, 8mA DC Bias 
Insertion Loss    :-1.0dB MAX  / 1.0-100MHz
Return Loss       :-20dB MIN  / 1-10MHz
                              :-16dB MIN  /  10-30MHz
                              :-12dB MIN  / 30-60MHz
                              :-10dB MIN  / 60-100MHz
Cross talk :         :-40dB MIN  / 1-30MHz
                              :-35dB MIN  / 30-60MHz
                              :-30dB MIN  / 60-100MHz
Common Mode Rejection : -30dB MIN /  1-50MHz 
                                               : -20dB MIN  / 50-150MHz

HIPOT TEST : 1500Vrms Min.
OPERATING TEMPERATURE RANGE : 0℃ ~ +70℃

If you have other demand,please feel free to contact us.