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What does TDI stand for?

TDI stands for Transistor Devices Inc


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The JEDEC EIA370 transistor device numbers usually start with "2N", indicating a three-terminal device (dual-gate field-effect transistors are four-terminal devices, so begin with 3N), then a 2, 3 or 4-digit sequential number with no significance as to device properties (although early devices with low numbers tend to be germanium). For example, 2N3055 is a silicon n–p–n power transistor, 2N1301 is a p–n–p germanium switching transistor.
Understanding a conventional 2N3055 spec sheet can probably be quite difficult for the many noobs in the field. The various aspects normally involved with these devices like VCEO, VCBO, fT, PTC end up only being the facts on the sheets, with the folks failing to get the complete view of the internal operations of the part. Here we take a closer look at all the specific parameters related with the device and unfold each of them making them truly understandable to all. Application hints regarding how to install transistor 2N3055 and paralleling 2N3055 have also been included for better understanding of the component.
Before we go back to the dark ages, let?s examine the standard version of transistor history, courtesy of Andrew Wylie, who has set up an excellent website devoted to early transistor devices.