The maximum voltage drop across the device (Vce) during the ON condition can have two different values as follows: The point of this analysis is to acknowledge the importance of designing the circuit of the transistor for a hassle-free operation despite a high gain bandwidth. The gain at this point is ten times of the minimum gain that the transistor gradually achieves at the end for IC = 100 mAdc at VCE = 1.0 Vdc. The minimum gain for 2N3904 is 40 for IC = 0.1mA which goes up to max 300 for IC = 10 mAdc at VCE = 1.0 Vdc. You can see the PNP type has 50% less gain than the NPN type- the biggest reason why the NPN type is so popular. The 2N3904 datasheet also lists the DC current gain (hFE) of its alternative 2N3903 (PNP) in separate rows. The table below shows the ON characteristics of 2N3904. Now let’s take a look at the gain table of the device. The power dissipation is in milliwatts, clearly showing that the device is not designed for high-power applications. The 2N3904 transistor has maximum ratings, as shown in the table below.Īs you can see, the transistor can conduct a maximum 200mAdc with a maximum input voltage of 6 Vdc applied between base and emitter. 2N3904 Datasheet Analysis Maximum Ratings Knowing how to read the 2N3904 datasheet helps engineers better design it for reliable amplification and switching applications. It is an NPN BJT transistor yet comes in PNP configuration (2N3906) as well. The 2N3904 is a small signal transistor, registered by Motorola in the mid-1960s, used for general purpose switching (100 mA) and amplification (100 MHz) applications. A small signal transistor is designed for applications dealing with low voltages and currents, definitely not for power amplifiers.
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