FMMT3904TA Discrete Semiconductor Products

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The FMMT3904TA is a PNP small signal surface-mount transistor made by the Fairchild Semiconductor. It is a single general use transistor and can be used for switching and amplifier applications. This article will discuss the application field of the FMMT3904TA and its working principle.

This FMMT3904TA transistor is mainly used as an amplifier and as a switch in electronic equipment and circuits. It can be used for functions such as driving loads and amplifying signals. It can also be used to increase the gain of an audio amplifier or reduce the current draw of a load. Additionally, because it is surface-mount, it can be used to save valuable space in certain components.

The FMMT3904TA has an impressive hFE range of 80-800, and its typical hFE is 500. This means it can be used to control larger amounts of current than some other transistors in its class. Other noteworthy specifications include a DC current gain of 15mA, a maximum collector-emitter voltage of 80V, and a typical power dissipation of 500mW.

Now that we understand the FMMT3904TA\'s application field, it is also important to discuss its working principle. As a PNP bipolar junction transistor (BJT), it has three terminals—the Collector, Base and Emitter. When the Base voltage exceeds the emitter voltage, holes in the junction between the Collector and Base are injected into the Base. This creates a feedback loop that amplifies the original signal and directs it to the Collector. The Collector then delivers the amplified current to the load, while the Emitter carries the amplified current away.

The Base-Emitter voltage of the FMMT3904TA is around 0.7V and can oscillate between 0.3V and 1V, depending on the current and other operating factors. The Base-Collector voltage is around 0.5V and similarly can oscillate from 0.2V to 1V depending on the current. The physical layout of the FMMT3904TA has the base in the center, the collector on the left and the emitter on the right.

In summary, the FMMT3904TA transistor is used for a number of amplifier and switching applications. It is a PNP bipolar junction transistor (BJT) with three terminals—the Collector, Base, and Emitter. It has a hFE range of 80-800, a DC current gain of 15mA, a maximum collector-emitter voltage of 80V, and a typical power dissipation of 500mW. All of these features make the FMMT3904TA a valuable option for a range of electrical and electronic components.

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