This part is a kind of semiconductor called APTLGT400A608G.
Function of this product has Phase leg Intelligent Power Module.
Manufacturers : Microsemi Corporation
Image and pinout :

Some of the text within the PDF file :
APTLGT400A608G Phase leg Intelligent Power Module VCES = 600V IC = 400A @ Tc = 80°C Application • Motor control • Uninterruptible Power Supplies • Switched Mode Power Supplies • Amplifier Features • Non Punch Through (NPT) FAST IGBT - Low voltage drop - Low tail current - Soft recovery parallel diodes - Low diode VF - Low leakage current - RBSOA & SCSOA rated • Integrated Fail Safe IGBT Protection (Driver) - Top Bottom input signals Interlock - Isolated DC/DC Converter • Low stray inductance • M5 power connectors • High level of integration VBUS 0/VBUS OUT www.net These Devices are sensitive to Electrostatic Discharge. Proper Handling Procedures Should Be Followed. See application note APT0502 on www.microsemi.com www.microsemi.com 1-6 APTLGT400A608G �� [ ... ]
APTLGT400A608G PDF Datasheet Download
