Transistor Number

An ordinary bipolar transistor has three leads so the first digit for it will be 2. 2 pnp 2n3906.

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The gain is often quoted at a particular collector current ic which is usually in the middle of the transistors range for example 100 at 20ma means the gain is at least 100 at 20ma.

Transistor number. 1 publication order number. 2n2222ad 2n2222a small signal switching transistor npn silicon features milprf19500255 qualified available as jan jantx and jantxv maximum ratings ta 250c unless otherwise noted characteristic symbol value unit collectoremitter voltage vceo 50 vdc collectorbase voltage vcbo 75 vdc. 2n2222a is a npn transistor hence the collector and emitter will be left open reverse biased when the base pin is held at ground and will be closed forward biased when a signal is provided to base pin.

This is assuming the simplest design using the minimum number of transistors in switching mode as an amplifier whose output swings from vcc to gnd or as close as it can get faster logic will have more transistors some to pull up the output voltage and some to pull it down. Each input must pass through two transistors. The transistor density is the number of transistors that are fabricated per unit area typically measured in terms of the number of transistors per square millimeter mm2.

Sometimes minimum and maximum values are given. For high side switch circuits you need a pnp style bjt. 2n2222a has a gain value of 110 to 800 this value determines the amplification capacity of the transistor.

Its emitter connects to the high voltage since i recommended a 2n3904 for the npn i will suggest its complement. Note that current gain is just a number so it has no units. 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.

The first digit is the number of leads minus one. Using the numbering scheme it can be seen that a transistor with the part number bc107 is a silicon low power audio transistor and a bby10 is silicon variable capacitance diode for industrial or commercial use. The typical format for the transistor is a digit letter and serial number.

The transistor density usually correlates with the gate length of a semiconductor node also known as a semiconductor manufacturing process. A high side circuit is where the load sits between the transistors collector and the circuits ground.

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