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Generally, a 2N3904 transistor is the preferred remote diode. Several samples of each of the transistors listed in Table 1 were evaluated and their ideality factor was determined to be ~1.004. (Typically, the ideality factor is not be stated in the data sheet for a transistor.) While transistor devices other than the ones cited here could (For the above measured 2N3904, the Early voltage ranges from 100 to 150 V. That is the extrapolated characteristic curves do not intersect at a point.) The actual relationship between the collector current (I C) and the controlling base current (I B) and collector-emitter voltage drop (V CE) is some complicated function which we can denote: Order today, ships today. 2N3904-AP – Bipolar (BJT) Transistor NPN 40V 200mA 250MHz 600mW Through Hole TO-92 from Micro Commercial Co. Pricing and Availability on millions of electronic components from Digi-Key Electronics.