2N4400 Transistor: Datasheet, Pinout, Equivalents

2N4400 Pinout

Pin Description

The 2N4400 is a TO-92 packaging NPN transistor with a VCE of 100V and a continuous collector current of 1A. This transistor can be employed in fairly high voltage switching applications with this characteristic and 1W total power dissipation.

2N4400 Symbol

2N4400 Footprint

2N4400 3D Model

ON Semiconductor 2N4400BU technical specifications, attributes, parameters and parts with similar specifications to ON Semiconductor 2N4400BU.

• Bi-Polar NPN, high voltage Transistor

• Collector-Emitter Voltage, VCE 40V

• Collector-Base Voltage, VCB 60V

• Emitter-Base Voltage, VEB 6V

• DC Current Gain (hFE) is 150 maximum

• Continuous Collector current (IC) is 600mA

• Base Current (IB) is 50mA maximum

• Collector Dissipation: 625 mW

• Transition Frequency:200 MHz

• Collector Capacitance 30pF

• Input Impedance 7.5K, where IC 1mA, VCE 10V, F 1KHz

• Operating Junction Temperature Max (Tj): 150 °C

• Available in TO-92 Package

• Simple switching applications

• Microphone preamplifiers

• Lighting systems

• Relay drivers

• Audio Amplifiers

• Signal Amplifiers

BC547, BC548, BC549, BC488.

The 2N4400 transistor is a highly adaptable device that can be used in a wide range of applications. This transistor can be used to switch relatively high voltage devices, such as a tiny DC-DC converter or the pre or mid amplifier stage of a power amplifier (power amplifiers typically require 45 to 60 DC). This gadget is inexpensive and simple to use, making it the best choice for a random switching device.

Because transistors are current-controlled devices, a small amount of current is required to turn them on. The base current of the 2N4400 Transistor is less than 50mA since it is an NPN transistor, which means it is on when the base is connected to the ground and off when a positive voltage is given to the transistor's base.

The simulated circuit below shows how this transistor operates when the basic circuit's base is connected to the ground and when the power supply's 5V is applied.

How to use 2N4400

We utilized a simple switching circuit with the 2N4400 transistor for simulation, and the base of this transistor is connected to a clock source with a 1Hz signal, which is responsible for switching the circuit; we used the oscilloscope tool in proteus for visualization. In the oscilloscope, the blue signal represents the input signal, while the yellow signal represents the output signal. When the supplied pulse is high, the transistor will stay on until the voltage at the transistor's base falls below 0.7-0.9V, which is the transistor's cut-off voltage.

Because the base of the transistor cannot be left floating, erroneous triggering may occur, causing problems in the circuit, we must employ pulldown resistors to remedy the problem. In the example, a 10K resistor is used to pull up the transistor's base to the ground.

2N4400 Package

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Download datasheets and manufacturer documentation for ON Semiconductor 2N4400BU.