MMBT3904,215

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Transistor Type:	NPN
Current - Collector (Ic) (Max):	200mA
Voltage - Collector Emitter Breakdown (Max):	40V
Vce Saturation (Max) @ Ib, Ic:	300mV @ 5mA, 50mA
Current - Collector Cutoff (Max):	50nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	100 @ 10mA, 1V
Power - Max:	250mW
Frequency - Transition:	300MHz
Operating Temperature:	150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	TO-236AB (SOT23)
Base Part Number:	MMBT3904

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Introduction: MMBT3904 is a type of small signal NPN alternating current (AC) transistor, manufactured by Zetex Semiconductor, with a wide range of applications. The device is composed of two Darlington power transistors in one package, designed like a standard TO-92. The package has three pins: base (B), collector (C), and emitter (E). The MMBT3904 is commonly used in many circuit applications, such as audio amplifiers, low-noise amplification circuits, signal switching, signal mixing, and voltage regulation. It is also used to build logic circuits and provides a low-cost alternative to more expensive components.Application Field: MMBT3904 has many applications in fields such as consumer electronics, industrial control systems, automotive applications, and audio equipment. The device is commonly used for voltage regulation, where it is used to adjust the output voltage of a power supply. It is also used in audio amplifiers as a signal booster, as well as in switching circuits and relay stages. In consumer electronics, the MMBT3904 is a low-cost alternative to more expensive components, used in audio amplification, radio transmission, and signal mixing.Working Principle: The MMBT3904 works by providing a current path between its base, collector, and emitter pins. When a voltage is applied to its base pin, current can flow from its collector to its emitter. The amount of current that can flow depends on the voltage applied to the base and the capacitance between the base and emitter pins. As the voltage at the base increases, the current flowing through the transistor increases. This increase in current causes a corresponding increase in the voltage at the collector, resulting in an amplification of the applied voltage.Conclusion: MMBT3904 is an NPN transistor widely used in a range of applications, providing a cost-effective solution for many circuit components. It is used in combination with other electronic components to create an electronic circuit, with the transistor providing a current path between its base, collector, and emitter pins. The voltage applied to the base of this device determines the amount of current that flows through it, allowing for voltage regulation, amplification of signals, and switching of signals.

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