The FZT491 is a high-performance NPN silicon planar medium power transistor manufactured by Zetex Semiconductors (now Diodes Incorporated). It is designed for use in a variety of amplifier and switching applications where high gain and low saturation voltage are required.

Applications

• Medium Power Amplifiers: Used to amplify signals in various electronic circuits.
• Switching Circuits: Employed in switching applications for efficient and reliable performance.
• Line Drivers: Used to drive signals over long distances with minimal signal degradation.
• Motor Control: Utilized in motor control circuits for efficient and precise control of motor speed and direction.
• Interface Circuits: Used as an interface between different electronic circuits.

Features

• High Gain: Provides high current gain for efficient amplification.
• Low Saturation Voltage: Ensures minimal power loss in switching applications.
• High Collector Current: Capable of handling relatively high collector currents.
• Low On-Resistance: Reduces power dissipation and improves efficiency.
• Surface Mount Package: Designed for automated assembly on printed circuit boards (PCBs).

Benefits

• Efficient Amplification: High gain allows for efficient amplification of signals.
• Reduced Power Loss: Low saturation voltage minimizes power loss in switching applications.
• Improved Performance: High collector current and low on-resistance enhance overall circuit performance.
• Easy Assembly: Surface mount package facilitates automated assembly, reducing manufacturing costs.
• Reliable Operation: Ensures consistent and dependable operation in various environments.

Technical Specifications

The FZT491 has a collector-emitter voltage (VCEO) rating of 150V and a collector current (IC) rating of 1A. The typical DC current gain (hFE) is high, ensuring efficient amplification. The transistor is available in a SOT-223 surface mount package. It features low saturation voltage and is designed for medium power applications.