This part is a kind of semiconductor called ACPL-W314.
Function of this product has 0.6 Amp Output Current IGBT Gate Driver Optocoupler.
Manufacturers : Avago Technologies
Image and pinout :

Some of the text within the PDF file :
ACPL-P314 and ACPL-W314 0.6 Amp Output Current IGBT Gate Driver Optocoupler Data Sheet Description The ACPL-P314/W314 consists of a GaAsP LED optically coupled to an integrated circuit with a power output stage. These optocouplers are ideally suited for driving power IGBTs and MOSFETs used in motor control inverter applications. The high operating voltage range of the output stage provides the drive voltages required by gate controlled devices. The voltage and current supplied by this optocoupler makes it ideally suited for directly driving small or medium power IGBTs. Functional Diagram ANODE 1 N.C. 2 CATHODE 3 SHIELD 6 VCC 5 VO 4 VEE Truth Table LED VO OFF LOW ON HIGH Note: A 0.1 µF bypass capacitor must be connected between pins VCC and VEE. Features • High speed response. �� [ ... ]
ACPL-W314 PDF Datasheet Download
