TO-92

The case is often made of epoxy or plastic, and offers compact size at a very low cost.

When looking at the face of the transistor, the leads are commonly configured from left-to-right as the emitter, base, and collector for 2N series (JEDEC) transistors, however, other configurations are possible, such as emitter, collector, and base commonly used for 2S series (Japanese) transistors or collector, base, and emitter for many of the BC series (Pro Electron) types.

[3] Units with their leads pre-bent may be ordered to fit specific board layouts, depending on the application.

The physical dimensions of the TO-92 housing may vary slightly depending on the manufacturer, however, the 1.27mm lead spacing must be respected.

In the late 1960s, Ferranti introduced a smaller package with a compatible footprint, called "E-Line".