This part is a kind of semiconductor called EFS.

Function of this product has STARLIGHT-KIT.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® EFS STARLIGHT-KIT Application Specific Discretes 2-CHIPS SET FOR FLUORESCENT LAMP STARTER A.S.D.™ FEATURES n n n n n n n VERY WIDE TEMPERATURE RANGE: tube ignition from - 30 to + 85 °C SINGLE SHOT IGNITION FROM -30 to 0°C : 350mA, 1350V striking pulse VERY WIDE POWER RANGE: Fluorescent tube lamp ignition from 18 to 70W EFS2B driver compatible with 50/60Hz operation SELECTABLE PREHEAT TIME: EFS2A driver: 1.5s or 2.56s (50Hz) EFS2B driver: 0.74s or 1.24s (50Hz) EFS2B driver: 0.62s or 1.03s (60Hz) 8 STRIKING PULSES CAPABILITY: for very cold environment or ageing lamp STARTER SHUTDOWN WITH FAILED LAMP S014 EFS2A-CD EFS2B-CD BENEFITS n n n n Very low component count: 2 chips + 7 passive components Meet EN55015 standards WITHOUT EMI capacitor Extended life time of the fluor [ ... ]

EFS PDF Datasheet Download