FJN4311RBU

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	PNP - Pre-Biased
Current - Collector (Ic) (Max):	100mA
Voltage - Collector Emitter Breakdown (Max):	40V
Resistor - Base (R1):	22 kOhms
DC Current Gain (hFE) (Min) @ Ic, Vce:	100 @ 1mA, 5V
Vce Saturation (Max) @ Ib, Ic:	300mV @ 1mA, 10mA
Current - Collector Cutoff (Max):	100nA (ICBO)
Frequency - Transition:	200MHz
Power - Max:	300mW
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package:	TO-92-3

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Introduction

FJN4311RBU is a single pre-biased transistor used for a variety of applications in digital and analog circuits. It is a popular choice among hobbyists, engineers and technicians. The FJN4311RBU can be considered as a general-purpose transistor and is used in several applications from audio amplifiers to power controllers. In this article, we will discuss the FJN4311RBU application field and its working principle.

Application Field

The FJN4311RBU is suitable for general small-signal amplification, switching and rectification. Its wide range of application includes amplifiers, drivers, switches and other small signal circuitry where it is used to provide an input current gain of 26 to 33 subject to slight variations due to the manufacturing process. Apart from this, it can also be used as an on/off switch which is common in fan controls, light dimmers and other applications. As this transistor can be used for switching operations, it can be used as a driver in relays, solenoids and other electromechanical devices which require a high current load or output. In addition, the FJN4311RBU can also be used in linear regulated power supplies as it has an excellent temperature stability which allows the device to deliver the same output voltage even in varying operational temperatures. Lastly, it can also be used as an analog amplifier since the transistor can deliver gain at a low voltage, and its excellent linearity makes it suitable for driving analog devices, such as in power audio and phones systems.

Working Principle

The FJN4311RBU is a general-purpose NPN pre-biased transistor, meaning that the pin configuration is designed in such a way that makes the device an easy choice for simple applications without the need of additional bias setting. This makes the device excellent for quick set up and simplicity in use. The transistor works when a voltage is applied between its base and emitter terminals. This in turn actuates the collector to emitter junction and activates the transistor. The voltage applied has to be greater than the minimum cut-in voltage for the corresponding transistor type. As the voltage continues to increase, the transistor will enter into active operation, producing a collector-emitter current depending on the base current and the gain of the particular transistor type.The value of gain of the FJN4311RBU transistor is determined by its internal design and is known as the common-emitter current gain of hfe. This is the ratio between the collector current and the base current, and is indicated by a number, typically between 26 and 33 for this particular device.

Conclusion

The FJN4311RBU is a pre-biased NPN transistor that is used in many digital and analog applications. It can be used as an amplifier, driver, or switch, as well as in linear regulated power supplies. Its internal design provides a current gain of between 26 and 33, which is determined by its common-emitter current gain of hfe. In this article, we have discussed the FJN4311RBU application field and its working principle.

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