This part is a kind of semiconductor called D44H11.

Function of this product has SILICON POWER TRANSISTORS.

Manufacturers : RECTRON

Image and pinout :

Some of the text within the PDF file :

NPN D44H SERIES PNP D45H SERIES 10 AMPERES COMPLEMENTARY SILICON POWER TRANSISTORS 60,80 VOLTS FEATURES * ...for general purpose power amplification and switching such as output or driver stages in applications such as switching regulators, converter and power ampifiers. * Low Collector-Emitter Saturation Voltage VCE(sat) = 1.0 V (max.) @8.0A * Fast Switching Speeds * Complementary Pairs Simplifies Designs MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25OC ambient temperature unless otherwise specified. MAXIMUM RATINGES ( @ TA = 25oC unless otherwise noted ) RATINGS SYMBOL Collector-Emitter voltage Emitter-Base voltage Collector current-Continutious -Peak (Note 1) Collector Power dissipation @TC=25OC @TA=25OC Thermal Resistance Lead Temperature for Soldering Purposes: 1/8 [ ... ]

D44H11 PDF Datasheet Download