The FMMT491A is a high-voltage, NPN bipolar junction transistor (BJT) manufactured by Zetex Semiconductors (now Diodes Incorporated). It is designed for high-voltage switching and amplification applications. This transistor boasts a high breakdown voltage and is commonly used in applications where higher voltages are present.

Applications

• High voltage switching
• Linear amplification
• High voltage inverters
• Power supplies
• Driving inductive loads

Features

• High breakdown voltage (VCEO = 400V)
• Low saturation voltage
• Fast switching speed
• High gain
• Surface Mount Device (SMD)
• Lead-Free Finish/RoHS Compliant

Benefits

• High voltage capability: Allows for use in applications with high voltage requirements.
• Efficient switching: The low saturation voltage and fast switching speed contribute to efficient power conversion.
• Space-saving: The small SMD package saves board space.
• Reduced power loss: Low saturation voltage reduces power dissipation and improves efficiency.
• Reliable operation: Designed for robust performance in demanding applications.

Technical Specifications

Here are some key specifications for the FMMT491A:

• Collector-Emitter Voltage (VCEO): 400V
• Collector-Base Voltage (VCBO): 450V
• Emitter-Base Voltage (VEBO): 6V
• Collector Current (IC): 200mA
• Power Dissipation (PD): 500mW
• Operating and Storage Temperature Range: -55°C to +150°C
• Package: SOT-23

The FMMT491A's high voltage capability and efficient switching characteristics make it suitable for a variety of high-voltage applications. Its small size and surface mount packaging allow for efficient use of board space. This NPN transistor provides a reliable and cost-effective solution for high voltage switching and amplification needs.