This part is a kind of semiconductor called 15MQ040N.

Function of this product has SCHOTTKY RECTIFIER.

Manufacturers : International Rectifier

Image and pinout :

Some of the text within the PDF file :

Bulletin PD-20517 rev. H 07/04 15MQ040N SCHOTTKY RECTIFIER 3 Amp IF(AV) = 3 Amp VR = 40V Major Ratings and Characteristics Characteristics IF VRRM IFSM @ tp = 5 µs sine VF TJ @ 2Apk, TJ=125°C range DC Description/ Features The 15MQ040N Schottky rectifier is designed to be used for low-power applications where a reverse voltage of 40 volts is ancountered and surface mountable is required. 15MQ040N Units 3 40 330 0.43 - 40 to 150 A V A V °C Applications Switching power supplies Meter protection Reverse protection for power input to PC board circuits Battery isolation and charging Low threshold voltage diode Free-wheeling or by-pass diode Low voltage clamp Features Surface mountable Extremely low forward voltage Improved reverse blocking voltage capability relative to other similar [ ... ]

15MQ040N PDF Datasheet Download