This part is a kind of semiconductor called HTA.

Function of this product has HIGH RELIABILITY DC-DC CONVERTER.

Manufacturers : International Rectifier

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Some of the text within the PDF file :

PD-97309B HTA-SERIES HIGH RELIABILITY DC-DC CONVERTER Description The HTA Series of DC-DC converters is a family of 20W, single and dual output, high reliability devices designed to operate in extremely high temperature environments such as those encountered in oil exploration applications. Features include small size, low weight and high tolerance to environmental stresses such as wide temperature extremes, severe shock and vibration. All internal components are derated to meet the intended operating environment. Documentation including electrical stress and thermal analysis are available. The converters incorporate a fixed frequency single forward topology with magnetic feedback and internal EMI filter. All models include an external inhibit port and have an adjustable output voltage. T [ ... ]

HTA PDF Datasheet Download