This part is a kind of semiconductor called B601.
Function of this product has 2SB601.
Manufacturers : NEC
Image and pinout :
Some of the text within the PDF file :
DATA SHEET SILICON POWER TRANSISTOR 2SB601 PNP SILICON EPITAXIAL TRANSISTOR (DARLINGTON CONNECTION) FOR LOW-FREQUENCY POWER AMPLIFIERS AND LOW-SPEED SWITCHING FEATURES • High-DC current gain due to Darlington connection • Low collector saturation voltage • Low collector cutoff current • Ideal for use in direct drive from IC output for magnet drivers such as treminal equipment or cash registers PACKAGE DRAWING (UNIT: mm) ABSOLUTE MAXIMUM RATINGS (Ta = 25°C) Parameter Collector to base voltage Collector to emitter voltage Emitter to base voltage Collector current Collector current Base current Total power dissipation Total power dissipation Junction temperature Storage temperature Symbol VCBO VCEO VEBO IC(DC) IC(pulse)* IB(DC) PT (Ta = 25°C) PT (Tc = 25°C [ ... ]