MMBT4401_D87Z

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Transistor Type:	NPN
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, 1V
Power - Max:	350mW
Frequency - Transition:	250MHz
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3
Base Part Number:	MMBT4401

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Introduction

MMBT4401_D87Z is bipolar junction transistors (BJT) which are renowned for highly linear, low capacitance switching and linear amplifier applications. It is a NPN transistor with a moderate gain value, good frequency response and excellent switching performance. A common application in which this device is used is as a switch. It is able to control large currents and voltages through the use of its low On resistance and high current gain.

Applications

The MMBT4401_D87Z is most commonly used as a linear amplifier in both AC and DC circuits. Its low output impedance and wide dynamic range makes it ideal for amplifying low level signals. It is also used as a signal switch, allowing the user to switch between two channels of audio or video signal, or between two sources, such as a microphone and a loudspeaker.In motor control, the MMBT4401_D87Z can be used in H-bridges, allowing current and voltage control over DC motors or stepper motors. This allows the user to control acceleration, deceleration, and torque of the motor through the transistor.Additionally, the MMBT4401_D87Z can be used as a current probing device, allowing the user to measure and monitor current levels of various circuits. It is also used in power supply circuits, as it has good power dissipation, low leakage currents, and high voltage ratings.

Working Principle

MMBT4401_D87Z works by using a bipolar junction transistor\'s (BJT) base-emitter-collector architecture to switch or amplify signals. The transistor consists of three distinct layers that form the base, emitter, and collector junctions. When voltage is applied to the base junction, current flows from the emitter to the collector. This is known as the transistor\'s beta ratio, or β. The β ratio determines the amount of current that will flow through the transistor.The current carrying flow through the transistor is regulated by the base-emitter voltage, which controls the collector-emitter current.The behavior of a BJT relies heavily on how its base-emitter voltage changes as collector current increases. This is known as the device’s h-parameter, or HFE. The HFE of the MMBT4401_D87Z is typically high, making it suitable for a variety of analog or digital applications.

Conclusion

The MMBT4401_D87Z is a general-purpose bipolar junction transistor (BJT). Its high current gain and low output impedance makes it suitable for both analog and digital applications. It is often used as a linear amplifier, signal switch, motor control device, current measurement or power supply transistor. Its working principle involves the control of collector current via the base-emitter voltage, allowing the user to accurately control current levels in circuits.

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