Description PSi Technologies Holdings makes packages that hold power semiconductors in the silicon equivalent of a full nelson. The company provides packaging and assembly services to top chip makers, such as Infineon, ON Semiconductor, STMicroelectronics, and Texas Instruments. PSi Technologies takes customers' semiconductors and embeds them into protective casings in preparation for use; it specializes in working with power management semiconductors, such as field-effect transistors and voltage regulators -- devices that are built to handle high power levels and that require heavy-duty packaging techniques. Integrated Micro-Electronics, a semiconductor division of Philippine conglomerate Ayala, owns 56% of PSi Technologies.