The FMMT3906 is a surface-mount NPN bipolar junction transistor (BJT) from Zetex Semiconductors (now Diodes Incorporated). It is designed for general-purpose amplification and switching applications. Its compact SOT-23 package makes it ideal for space-constrained applications where minimizing board footprint is crucial.

Applications

• Low-power amplification: Suitable for amplifying small signals in various electronic circuits.
• Switching circuits: Used as a switch in applications such as driving relays, LEDs, and other small loads.
• Driver stages: Can be employed as a driver for higher-power transistors.
• General-purpose applications: Suitable for a wide range of general-purpose applications in electronic circuits.
• Mobile devices: Found in portable devices due to its small size.

Features

• NPN Transistor: A standard NPN BJT.
• Surface Mount Package: SOT-23 package for easy surface mounting.
• High Collector Current: Capable of handling collector currents up to 200mA.
• Low Saturation Voltage: Low VCE(sat) ensures efficient switching.
• High Transition Frequency: Offers a high transition frequency for faster switching speeds.
• Lead-Free Finish/RoHS Compliant: Environmentally friendly.

Benefits

• Space Saving: The small SOT-23 package minimizes board space.
• Efficient Switching: Low saturation voltage reduces power dissipation during switching.
• Versatile: Suitable for a broad range of amplification and switching applications.
• Reliable Performance: Provides stable and dependable performance in various operating conditions.
• Easy to Use: Surface mount package simplifies assembly process.

Additional Details

The FMMT3906 has a collector-emitter voltage (VCEO) of 40V and a collector current (IC) of 200mA. Its transition frequency (fT) is typically around 250 MHz, enabling it to be used in relatively high-speed switching circuits. The power dissipation is typically around 330mW. The transistor is commonly used in circuits where a small, efficient, and reliable NPN transistor is needed. It’s also available in tape and reel packaging for automated assembly processes. It is designed to be RoHS compliant.