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what is this ic

esinior

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hi, j have a 220v motor driver and i think it is a dimmer from its bt138 triac (it goes to a 220-24 trans and then to the motor) and its ic surface is erased and expunged and i don't know its number, does anyone know what this could be?
WhatsApp Image 2021-08-10 at 20.20.02.jpeg

WhatsApp Image 2021-08-10 at 20.18.50.jpeg
 

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