Transistor array

Transistor arrays are used for general purpose applications, function generation and low-level, low-noise amplifiers. They include two or more transistors on a common substrate to ensure close parameter matching and thermal tracking, characteristics that are especially important for 'long tailed pair' differential amplifiers.

Transistor arrays comprise if multiple transistor  in one package and help to improve the mounting density and reduce the mounting cost of discrete transistor employed for driving low power out put devices such as relays bulbs.