This part is a kind of semiconductor called TT2188.
Function of this product has (TT2187 - TT2201) Control Transformer.
Manufacturers : TEMCo
Image and pinout :

Some of the text within the PDF file :
Free Datasheet http://www.datasheet-pdf.com/ Free Datasheet http://www.datasheet-pdf.com/ Free Datasheet http://www.datasheet-pdf.com/ Free Datasheet http://www.datasheet-pdf.com/ [ ... ]
TT2188 PDF Datasheet Download
