AD company is an American multinational semiconductor device manufacturer, which manufactures ADC, DAC, MEMS and DSP chips for consumers and industrial products. AdI is the world's leading supplier of data conversion and signal processing technology, producing various innovative products including data converters, amplifiers and linear products, so the products produced by AD and ADI are different.

ADI is Adriano Semiconductor, also referred to as AD, and American ADI Company is one of the oldest semiconductor companies in the world.