Historically IDT manufactured MIPS processors developed by QED and also for a while its own x86 processor designed by its Centaur Technology subsidiary called the IDT WinChip. On September, 1999 IDT sold Centaur Technology x86 microprocessor design subsidiary to VIA Technologies.
On April, 1999 IDT acquired Quality Semiconductor (QSI) a supplier of clock management and bus switch logic.
On May, 2004, IDT acquired ZettaCom, Inc.
On Jun, 2005 IDT acquired Integrated Circuit Systems (ICS) for about $1.5 billion in cash and stock.
On October, 2005 IDT acquired Freescale Semiconductor's timing solutions business for $35 million.
In July, 2006 IDT acquired the PC Audio division of Austin-based company SigmaTel for $80 million.
One current speciality of the company are devices for network processing, in particular packet inspection products for firewalls. In October 2002 IDT acquired Solidum Systems, a maker of network search element devices
Another high-profile product is IDT's implementation of the Advanced Memory Buffer (AMB), an integral part of the Fully Buffered DIMM memory architecture.
According to the Silicon Valley Business Journal, Integrated Device Technology threatened the State of California that the company would move out-of-state if a ballot was passed on a measure called "Proposition 211" which was designed to introduce extra corporate oversight prior to the scandals of the late 1990s and early 21st century1. The proposition was subsequently defeated by 25.6% to 74.4%2.