2N4403TA

Series:	--
Packaging:	Tape & Box (TB)
Part Status:	Active
Transistor Type:	PNP
Current - Collector (Ic) (Max):	600mA
Voltage - Collector Emitter Breakdown (Max):	40V
Vce Saturation (Max) @ Ib, Ic:	750mV @ 50mA, 500mA
Current - Collector Cutoff (Max):	--
DC Current Gain (hFE) (Min) @ Ic, Vce:	100 @ 150mA, 2V
Power - Max:	625mW
Frequency - Transition:	200MHz
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Supplier Device Package:	TO-92-3
Base Part Number:	2N4403

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.Transistors - Bipolar (BJT) - SingleThe 2N4403TA is a device classified as NPN digital switch that can act as an amplifier or as a digital switch. This device is used in a variety of applications, primarily in digital systems and power supplies. With its gain of 125, it is capable of switching a high current load and is intended to be used as a low power output driver.The 2N4403TA consists of three regions: the base, the emitter, and the collector. It is a NPN bipolar junction transistor which means that the emitter is connected to the negative side of the power source and the collector is connected to the positive side. The base is the region used for controlling the flow of current. There is also a voltage divider network of two resistors connected between the collector and a fixed reference voltage. A NPN transistor acts as a switch in two states: cut-off and saturation. When a small current enters the base which turns the transistor “on”, then the collector current flows through to the emitter. If the base current is increased further, then the collector current increases proportionately. As the current draws more current from the base, the transistor moves from being in saturation to cut-off. To switch the transistor back “off”, the base current needs to be removed.From this, we can see that the 2N4403TA is used as an amplifier or a switch depending on the base current levels. In an amplifier mode, it is used to amplify a signal and increase the power of the output. When used as a switch, it can control the flow of current, switch between different voltage levels or quickly switch the output of the digital system.For electrical stability, the 2N4403TA should be biased at the voltage divider to let the transistor move off from a higher to a lower power level without causing instability. The quiescent current should be checked to make sure the base current level is correct and that the device does not produce too much heat. This transistor is also used for protection of the output from overloads and in emergency shut downs. In addition, it can be used to reduce the power dissipation through an output driver. When the output level is too high, the transistor will be used to reduce the output current and protect the system from damage.The 2N4403TA is designed for use in digital systems, power supplies and other applications where it can be used as an amplifier or a switch. Its ability to switch large amounts of current makes it a very useful device with many different uses. With proper design, the 2N4403TA can effectively amplify or switch signals, control digital systems and protect the output from overloads.

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