This part is a kind of semiconductor called GBLC12CI.

Function of this product has (GBLC03I - GBLC24CI) ULTRA LOW CAPACITANCE TVS ARRAY.

Manufacturers : Protek Devices

Image and pinout :

Some of the text within the PDF file :

05242 GBLC03I* thru GBLC24CI* ULTRA LOW CAPACITANCE TVS ARRAY APPLICATIONS ✔ Ethernet - 10/100/1000 Base T ✔ Cellular Phones ✔ Handheld - Wireless Systems ✔ Personal Digital Assistant (PDA) ✔ USB Interface IEC COMPATIBILITY (EN61000-4) ✔ 61000-4-2 (ESD): Air - 15kV, Contact - 8kV ✔ 61000-4-4 (EFT): 40A - 5/50ns ✔ 61000-4-5 (Surge): 24A, 8/20µs - Level 2(Line-Gnd) & Level 3(Line-Line) SOD-323 *PATENT PENDING FEATURES ✔ 350 Watts Peak Pulse Power per Line (tp=8/20µs) ✔ Unidirectional & Bidirectional Configurations ✔ Replacement for MLV (0805) ✔ Protects One Power or I/O Port ✔ ESD Protection > 40 kilovolts ✔ Low Clamping Voltage ✔ Available in Multiple Voltage Types Ranging From 3V to 24V ✔ Ultra Low Capacitance: 0.6pF Typical ✔ RoHS Compliant MECHAN [ ... ]

GBLC12CI PDF Datasheet Download