This part is a kind of semiconductor called 2SC5544.

Function of this product has Silicon NPN Epitaxial VHF / UHF wide band amplifier.

Manufacturers : Hitachi Semiconductor

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Some of the text within the PDF file :

2SC5544 Silicon NPN Epitaxial VHF / UHF wide band amplifier ADE-208-691 (Z) 1st. Edition Nov. 1998 Features • Super compact package; (1.4 × 0.8 × 0.59mm) • Capable low voltage operation ; (V CE = 1V) Outline MFPAK 3 1 2 1. Emitter 2. Base 3. Collector Note: Marking is “YZ-”. 2SC5544 Absolute Maximum Ratings (Ta = 25°C) Item Collector to base voltage Collector to emitter voltage Emitter to base voltage Collector current Collector power dissipation Junction temperature Storage temperature Symbol VCBO VCEO VEBO IC Pc Tj Tstg Ratings 15 8 1.5 50 80 150 –55 to +150 Unit V V V mA mW °C °C Electrical Characteristics (Ta = 25°C) Item Collector to base breakdown voltage Collector cutoff current Collector cutoff current Emitter cutoff current DC current transfer ratio Collect [ ... ]

2SC5544 PDF Datasheet Download