This part is a kind of semiconductor called 2SA1611.

Function of this product has PNP Silicon Plastic Encapsulated Transistor.

Manufacturers : SeCoS

Image and pinout :

Some of the text within the PDF file :

2SA1611 Elektronische Bauelemente -0.1A , -60V PNP Silicon Plastic Encapsulated Transistor RoHS Compliant Product A suffix of “-C” specifies halogen & lead-free FEATURES  High DC Current Gain  High Voltage  Complementary to 2SC4177 A 3 SOT-323 L 3 Top View C B 1 2 2 CLASSIFICATION OF hFE Product-Rank Range Marking Product-Rank Range Marking 2SA1611-M4 90~180 M4 2SA1611-M6 200~400 M6 2SA1611-M5 135~270 M5 2SA1611-M7 300~600 M7 F K 1 E D G REF. A B C D E F Millimeter Min. Max. 1.80 2.20 1.80 2.45 1.15 1.35 0.80 1.10 1.20 1.40 0.20 0.40 H J Millimeter Min. Max. 0.100 REF. 0.525 REF. 0.08 0.25 0.650 TYP. REF. G H J K L PACKAGE INFORMATION Package SOT-323 MPQ 3K LeaderSize 7’ inch  Base Collector   Emitter ABSOLUTE MAXIMUM RATINGS (TA = 25°C [ ... ]

2SA1611 PDF Datasheet Download