What does this number measure?
A discrete NPN bipolar transistor in a small cylindrical metal package with three pins. The onsemi 2N2222A/D data sheet, revision 2 of November 2013, gives dimension A as 5.31 to 5.84 mm. This is the outer diameter of the base flange, not the smaller diameter of the cap (dimension B: 4.52 to 4.95 mm). This reference adopts the upper limit of 5.84 mm. Pin length is not the compared dimension; the pins are drawn in simplified form. The silicon transistor is inside the package. Process names such as ‘2 nm’ or ‘3 nm’ do not specify a universal dimension for a whole transistor.
Compare the stated dimensions
The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.
Source and limitations
Manufacturer's datasheet consulted on 30 October 2026. The drawing shows a documented maximum envelope, not the measured size of an individual unit. Package dimensions and versions vary between manufacturers; this entry describes only the stated reference and source.
An original drawing of an electronic package, not a photograph. The common scale factor measures its documented maximum external width; pins and perspective are simplified and do not represent a measurement of the internal silicon die.