2N4124TA

Series:	--
Packaging:	Tape & Box (TB)
Part Status:	Obsolete
Transistor Type:	NPN
Current - Collector (Ic) (Max):	200mA
Voltage - Collector Emitter Breakdown (Max):	25V
Vce Saturation (Max) @ Ib, Ic:	300mV @ 5mA, 50mA
Current - Collector Cutoff (Max):	50nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	120 @ 2mA, 1V
Power - Max:	625mW
Frequency - Transition:	300MHz
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:	2N4124

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Introduction

The 2N4124TA is a NPN-transistor, belong to the Bipolar Junction Transistor (BJT) family of transistors, specifically single BJTs. It is a transistor made of semiconductor material and has forward and reverse biased junctions. It is used in amplification, parameter switch and signal switch applications.

Working Principle

The intrinsic principles of a NPN-transistor are simple to comprehend. It is composed of a P-type region and an N-type (base) region. It incorporates two P-N layers within one element, separated by a thin base region. The base region acts as an insulator between the two regions, which results in the transistor having a bidirectional behaviour. With this construction, when the electrons within a layer can move freely, the element\'s control current path allows electrons to saturate and achieve amplification. Current flows through the NPN transistor via three routes: emitter-collector, emitter-base, and collector-base. The forward bias is between the emitter-base and the reverse bias is between the collector and the base. The current between the emitter and the collector is controlled by the current between the base and the emitter.

Characteristics

The current gain of 2N4124TA is quite good, by varying the emitter-base current it can turn on and off the current between emitter and collector. This allows for efficient amplification and switching applications. In addition, the transistor has an excellent current gain of about 600 which makes it suitable for Micro amplifiers, audio amplifiers, and video amplifiers.The transistor is relatively slow and suitable for application up to 10MHz. It has a moderate voltage gain of about 20 and decent power handling for a small-signal transistor of up to 500mW dissipation making it ideal for a wide range of uses including audio and video amplifiers, parametric switches, and signal switches.In addition, the transistor has a wide temperature operating range from –65°C to 150°C and can function at the highest power over a wide temperature. It also provides a good frequency response with a sufficient power handling capacity.

Application Field

2N4124TA is an important component used in different electronic operations. It is used in a wide range of applications such as audio and video amplifiers, signal switching, parametric switching and many others. It can also be used in motor speed controllers, robotics and LED drivers; in audio preamplifier applications it is used to amplify signals or reduce distortion. It is useful in appliance controllers, automotive systems and industrial switchgear.The high current gain makes it suitable for use in video amplifiers and parametric circuits. In addition, it is suitable for applications with high impedances such as surface-mount amplifiers and hi-fi equipment.

Conclusion

2N4124TA is a current gain single Bipolar Junction transistor. Its main use is for signal switching and parametric switching applications. It is suitable for audio amplifiers, video amplifiers, LED drivers, robotics, motor speed controllers and various industrial switchgear. It also has a wide temperature operating range and a good frequency response with sufficient power handling capacity.

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