Hi ,
My customer is using TLV431AIDBZR , so we supplied them in the month of Sept-16 @2500 Nos.
They took part in production and It is observed that IC (TLV431A1 shunt regulator IC) pins having solderability problem.
Observations: - 1) Components leads have the blackish coating.
2) During re flow soldering no wettability exhibits. So difficult for Re flow soldering.
For more details kindly refer the following images.