MMBT3904 Transistor | Datasheet | Equivalent | Pinout MDD

MMBT3904 Pinout

MMBT3904 Pinout Diagram

The DC current gain of the MMBT3904 is 30-300 hFE, a value that represents the amplification capability of the transistor. The maximum withstand voltage is 40 V. The maximum current through the collector pin is 200 mA, so the MMBT3904 should not be used to connect loads that require more than 200 mA (generally design circuits with a 20% margin, which should be 200*0.8 for practical applications).
Principle of operation: When the base is grounded, the collector and emitter will remain open (inverted bias, disconnected between collector and emitter), and when a signal is supplied to the base pin the collector and emitter will conduct (forward bias, conduction between collector and emitter)..
MMBT3904 is mainly used in driving circuits, signal or current amplification circuits, and switching circuits for small loads. The main alternative products include: BC549, 2SC5200, 2N2222, and so on.

MMBT3904 Equivalent

The MMBT3904 is a widely used small signal NPN transistor, typically employed in general-purpose switching and amplification applications. Below is a list of equivalent transistors that share similar electrical characteristics, including voltage rating, current handling, and gain. These transistors are available in surface-mount (SMD) packages and are suitable for use in compact electronic circuits.

Picture	Part Number	Manufacturer	Package Type	Voltage Rating	Current Rating	Gain (hFE)	Power Dissipation
	MMBT3904	MDD	SMD (SOT-23)	40V	200mA	100 to 300	0.4W
	BC847	Diotec Semiconductor	SMD (SOT-23)	45V	100mA	110 to 800	0.5W
	SS8550	MDD	SMD (SOT-23)	45V	1A	110 to 800	0.6W
	S8050	Sanken Electric	SMD (SOT-23)	50V	1A	110 to 800	0.6W
	MMBT5401	ON Semiconductor	SMD (SOT-23)	50V	0.5A	100 to 400	0.5W

The transistors listed above are reliable alternatives to the MMBT3904, offering comparable performance in various electronic applications. Whether you need a direct replacement or a suitable option from a different manufacturer, these equivalents provide flexibility while maintaining the same general specifications. Always ensure compatibility with your circuit requirements when selecting a replacement.