This part is a kind of semiconductor called 12PS6121CX.

Function of this product has Single 10/100 Base-TX Lan Magnetic.

Manufacturers : Bothhand

Image and pinout :

Some of the text within the PDF file :

SINGLE 10/100 BASE-TX LAN MAGNETIC (DIP) Operating temperature range: 0℃ to +70℃ Storage temperature range:-25℃ to +105℃. BOTHHAND Enterprise Inc. Page 1 of 2 Electrical Specifications @25℃ Part Number Insertion Loss (dB Max) 0.3-100 MHz -1.1 -1.2 -1.2 -1.2 0.3-30 MHz -18 Return Loss (dB Min) 40 50 MHz MHz -15.5 -13 -13 -13 -13 -13 Cross talk (dB Min) 60-80 MHz -12 -11 -11 -11 -12 0.3-60MHz 60-100MHz 30MHz -45 -40 -40 -35 -35 -35 -40 DCMR (dB Min) 60MHz -35 100MHz -30 12PS6121A 12PS6121C 12PS6121CX 12PS6121UX 12PS1142X 1-30MHz / -15 1-30MHz / -15 1-30MHz / -15 -18 -15.5 1-100MHz / -35 1-100MHz / -35 1-100MHz / -35 -40 -35 -30 0.3-100MHz / -35 -45 -35 -1.1 Continue Turn Ratio (±5%) Part Number 12PS6121A 12PS6121C 12PS6121CX 12PS6121UX 12PS1142X T [ ... ]

12PS6121CX PDF Datasheet Download