This part is a kind of semiconductor called MC3406.

Function of this product has N-Channel 30-V (D-S) MOSFET.

Manufacturers : FreesCale

Image and pinout :

Some of the text within the PDF file :

Analog Power Freescale N-Channel 30-V (D-S) MOSFET These miniature surface mount MOSFETs utilize a high cell density trench process to provide low rDS(on) and to ensure minimal power loss and heat dissipation. Typical applications are DC-DC converters and power management in portable and battery-powered products such as computers, printers, PCMCIA cards, cellular and cordless telephones. • Low rDS(on) provides higher efficiency and extends battery life • Low thermal impedance copper leadframe SOT-23 saves board space • Fast switching speed • High performance trench technology AM2322N AO3406/ MC3406 PRODUCT SUMMARY VDS (V) rDS (on ) (Ω) 0.085 @ VGS = 10V 30 0.125 @ VGS = 4.5V ID (A) 2.5 1.7 G D S ABSOLUTE MAXIMUM RATINGS (TA = 25 C UNLESS OTHERWISE NOTED) Parameter Symbol Max [ ... ]

MC3406 PDF Datasheet Download