This part is a kind of semiconductor called STK621-033N-E.

Function of this product has Inverter Hybrid IC.

Manufacturers : Sanyo

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Some of the text within the PDF file :

Ordering number : ENA2127 STK621-033N-E Thick-Film Hybrid IC 3-phase Inverter Motor Drive Inverter Hybrid IC Overview This IC is a 3-phase inverter power hybrid IC containing power elements (IGBT and FRD), pre-driver, as well as protection circuit in one package. Application • 3-phase inverter motor drive Features • Integrates power elements (IGBT and FRD), pre-driver, and protective circuit. • Protective circuits including overcurrent (bus line), pre-drive low voltage protection are built in. • Direct input of CMOS level control signals without an insulating circuit (photocoupler, etc) is possible. • Built-in simultaneous upper/lower ON prevention circuit to prevent arm shorting through simultaneous ON input for the upper and lower side transistors. (Dead time is required for [ ... ]

STK621-033N-E PDF Datasheet Download