UTAC Holdings (United Test and Assembly Center) is a provider of semiconductor assembly and testing services for a range of integrated circuits. It specializes in wafer probes, wafer processing, assembly, test, black-box encryption, and direct shipment. The company offers bump, fan-in and fan-out WLCSP (wafer level chip scale package), 3D embedded substrate manufacturing, and burn-in support. UTAC also offers a complete suite of engineering services inclusive of package design, reliability and failure analysis, and test development. UTAC serves fabless companies, integrated device manufacturers, and wafer foundries.