MMBT3904 2N3904 1AM SOT-23 2N3904 SMD 40V 200mA NPN Transistor

MMBT3904 2N3904 1AM SOT-23 2N3904 SMD 40V 200mA NPN Transistor is a surface-mount NPN bipolar transistor supplied in a compact SOT-23 package. The part designation in the title identifies the device as the 2N3904 family in an SMD variant commonly used where board space is limited.

This transistor is suitable for general-purpose switching and signal amplification tasks in consumer electronics, industrial control circuits, and prototyping applications. The SOT-23 package provides a small footprint for dense PCB layouts while enabling straightforward reflow soldering for volume assembly. The listing indicates a maximum collector-emitter voltage of 40V and a maximum current of 200mA as specified in the product name.

Typical uses include low-current switching, interfacing to logic-level signals, driving small loads via a suitable base resistor, and serving as a signal stage in amplifier and oscillator circuits. When designing with this device, observe proper biasing and thermal considerations, and consult the manufacturer's datasheet for detailed pin assignments, absolute maximum ratings, characteristic curves, and recommended PCB land pattern. This product is offered as the SMD SOT-23 form of the common 2N3904 NPN transistor for applications requiring a compact, reliable switching or amplification device.