FMB3904

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The FMB3904 is a member of the bipolar array transistor family. It is a dual common-collector NPN transistor array with an integrated Darlington configuration. The device is a three-terminal, dual NPN transistor array that exhibits a high input impedance and a low gain output. It is designed for applications in which low-noise amplification is desired. Some typical fields of application for the FMB3904 include opto-couplers, voltage-controlled amplifiers and audio amplifiers.

The FMB3904 is a three-terminal device consisting of two integrated NPN transistors. The first transistor is a common-collector arrangement, while the second is configured as a Darlington emitter-follower stage with its collector being connected to drive the base of the first transistor. The active elements of the device have integrated matching, enabling the output stage to be driven with a high degree of linearity. By virtue of the Darlington configuration, the FMB3904 exhibits extremely low output impedance and a high current gain, albeit with a relatively low voltage gain. The device is designed such that the integrated signal can be amplified without modification.

The FMB3904 features low input bias and offset currents, ensuring low signal distortion and excellent noise performance. The input circuit of the device is designed for high voltage ac signals, allowing for direct interface with standard analog sources. The FMB3904 also features excellent thermal stability and low distortion, which make it an ideal choice for audio applications. Furthermore, the NPN transistor array can be used to increase the number of stages of delay or reduce the power consumption of the overall circuit.

The working principle of the FMB3904 is quite straightforward. The two transistors form an emitter follower circuit with a differential input, reducing the input impedance and increasing the output impedance. The common-collector transistor amplifies the differential input while the Darlington transistor increases the current gain. The output voltage is directly proportional to the base voltage, while the output current is directly proportional to the collector current. This makes the FMB3904 ideal for applications requiring low noise amplification and high current gain.

The FMB3904 is a robust and versatile transistor array. Its simple design makes it a popular choice for applications requiring high current gain and low noise performance. Its differential input and high gain output make it suitable for a wide range of audio and opto-coupler applications, while its low power consumption makes it a cost effective choice for applications requiring multiple stages of delay. The device’s integrated matching enables it to provide excellent linearity and thermal stability, making it an ideal choice for audio applications.

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