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The TO-92 is a widely used style of semiconductor package mainly used for transistors. The "TO" stands for "Transistor Outline," and "92" refers to the JEDEC standard package number.

Unlike the larger TO-220 or TO-3 packages, which are typically used for power transistors and regulators, the TO-92 package is generally used for low-power devices like small signal transistors.

The TO-92 is a through-hole package, meaning it's designed to be inserted into drilled holes on a printed circuit board (PCB) and then soldered into place. This package typically has three leads, which often come out of the bottom of the package in a triangular arrangement or in-line, depending on the manufacturer and specific device.

The TO-92 package is small, lightweight, and inexpensive, making it suitable for a wide range of applications.

As always, for specific information such as pin assignment, electrical characteristics, or precise physical dimensions, refer to the manufacturer's data-sheet for the specific device in question.