MMBT3904 Transistor NPN SOT-23 SMD COM11, R37

DescriptionEvery electronics designer needs a reliable, general-purpose NPN transistor in their toolkit. The MMBT3904 NPN Bipolar Transistor is exactly that. As the highly popular, surface-mount equivalent of the classic 2N3904, it provides excellent switching speeds, reliable signal amplification, and robust low-power handling for a massive variety of everyday circuit applications.The Ultimate General-Purpose NPN SwitchDesigned for fast, efficient logic-level control, the MMBT3904 comfortably handles continuous collector currents up to 200mA. This makes it the perfect choice for low-side switching. Use it to cleanly turn ground paths on and off for 3.3V or 5V sensors, drive small indicator LEDs, or act as a reliable interface between your microcontroller and heavier driver circuits.Compact SOT-23 FootprintModern electronics demand smaller footprints without sacrificing reliability. The SOT-23 surface-mount package allows you to integrate this versatile transistor into space-constrained IoT devices, wearables, and custom logic boards. Featuring the industry-standard top mark 1AM, this component is easy to identify during manual prototyping, inventory sorting, or automated pick-and-place assembly.Circuit Best PracticesThe MMBT3904 is frequently paired with its PNP complement, the MMBT3906, to create efficient Class B push-pull amplifiers or simple logic gates. Because it is a current-controlled device, always calculate and implement an appropriate base resistor to ensure the transistor reaches full saturation without drawing excessive current from your logic pins.Key FeaturesLow-Side Switching: Perfect for routing ground connections to external modules and sensors directly from logic pins.Fast Switching Speeds: Excellent for high-frequency PWM control and digital logic processing.Miniature Footprint: The SOT-23 SMD package optimizes valuable PCB real estate while maintaining great thermal stability.Technical SpecificationsTransistor Polarity: NPN BJTCollector-Emitter Voltage (VCEO): 40V MaximumCollector-Base Voltage (VCBO): 60V MaximumEmitter-Base Voltage (VEBO): 6V MaximumContinuous Collector Current (IC): 200mAPower Dissipation (PD): 350mWDC Current Gain (hFE): 100 to 300 (typical)Package Type: SOT-23 (Surface Mount)Top Marking Code: 1AMIdeal ApplicationsLow-Side Load Switching: Turning on power to LEDs, small relays, and logic-level modules.Logic Gate Construction: Building custom NOT, AND, and OR logic gates in discrete circuits.Signal Amplification: Serving as a reliable pre-amplifier or driver stage in audio and sensor circuits.Electronics Repair: Replacing faulty 1AM-marked NPN transistors in commercial logic boards, toys, and small appliances.