This part is a kind of semiconductor called STK621-015.

Function of this product has IGBT 600V/10A High Speed.

Manufacturers : Sanyo

Image and pinout :

Some of the text within the PDF file :

SANYO INVERTER POWER HYBRID MODULE SIP Full Molded Package TENTATIVE IGBT 600V/10A High Speed STK621-015 1. Overview: This IC is a 3-phase Inverter power hybrid IC containing power elements (IGBT and FRD), pre-driver, over-current protection circuit. 2. Application: 3-phase Inverter Motor. Induction Motor. Blushless-DC Motor 3. Features: • Integrates power elements (IGBT and FRD), pre-driver, and protective circuit. • Protective circuits including over-current (bus line), and pre-drive low voltage protection are built in. • Direct input of CMOS level control signals without an insulating circuit (photo-coupler, etc) is possible. • A single power supply drive is enabled through the use of bootstrap circuits for upper power supplies. (externally set) • Built-in simultaneous upp [ ... ]

STK621-015 PDF Datasheet Download