Hi, I don't know if you know that the X25043 was discontinued... But, there is a subsitute, the X5043... I received 3 samples... Xicor support said that this component is 100% compatible... I think that is not true....because my IC doesn't work more in my circuit...My friend developted too a circuit with X25043, and we have tested with x5043 without success too! Did someone have this experience too? Miguel Wisintainer