This part is a kind of semiconductor called 4AC14.

Function of this product has Silicon NPN Triple Diffused.

Manufacturers : Hitachi Semiconductor

Image and pinout :

Some of the text within the PDF file :

4AC14 Silicon NPN Triple Diffused Application Low frequency power amplifier Outline SP-10 3 2 4 ID ID 9 8 ID 1, 10 Emitter 2, 4, 6, 8 Base 3, 5, 7, 9 Collector ID 10 5 1 1 7 10 6 4AC14 Absolute Maximum Ratings (for each device, Ta = 25°C) Item Collector to base voltage Collector to emitter voltage Emitter to base voltage Collector current Collector peak current Diode current Collector power dissipation Symbol VCBO VCEO VEBO IC I C(peak) ID PC * 1 1 Ratings 150 150 7 5 10 5 4 28 150 –55 to +150 Unit V V V A A A W °C °C PC * (TC = 25°C) Junction temperature Storage temperature Note: 1. 4 devices operation. Tj Tstg Electrical Characteristics (for each device, Ta = 25°C) Item Symbol Min 150 150 7 1000 Typ Max �� [ ... ]

4AC14 PDF Datasheet Download