This part is a kind of semiconductor called 13003ADA.

Function of this product has NPN SILICON TRANSISTOR.

Manufacturers : Unisonic Technologies

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 13003ADA Preliminary NPN SILICON TRANSISTOR NPN SILICON BIPOLAR TRANSISTORS FOR LOW FREQUENCY AMPLIFICATION  DESCRIPTION The UTC 13003ADA is a silicon NPN power switching transistor; it uses UTC’s advanced technology to provide customers high collector-base breakdown voltage, low reverse leakage current and high reliability, etc. The UTC 13003ADA is suitable for electronic ballast power switch circuit and the compact electronic energy-saving light.  FEATURES * High collector-base breakdown voltage * Low reverse leakage current * High reliability  EQUIVALENT CIRCUIT  ORDERING INFORMATION Ordering Number Lead Free Halogen Free 13003ADAL-TM3-T 13003ADAG-TM3-T 13003ADAL-T60-F-K 13003ADAG-T60-F-K 13003ADAL-T92-F-B 13003ADAG-T92-F-B 13 [ ... ]

13003ADA PDF Datasheet Download