The QTC4N28 is a Quad Transistor Array manufactured by Fairchild/ON Semiconductor. This device consists of four NPN transistors fabricated on a single monolithic die. It is designed for general-purpose switching and amplification applications. The QTC4N28 is commonly used in circuits where multiple transistors with similar characteristics are required, simplifying design and reducing component count.

Applications:

• General-purpose switching circuits
• Amplifier circuits
• Driver circuits
• Level shifters
• Logic gates
• Interface circuits

Features:

• Four NPN transistors in a single package
• High collector-emitter voltage (VCEO) rating
• High current gain (hFE)
• Low saturation voltage (VCE(sat))
• Fast switching speeds
• Small signal amplifier
• DIP-14 package

Benefits:

• Reduced component count: Integrates four transistors into a single package, simplifying circuit design and reducing board space.
• Matched transistor characteristics: Ensures consistent performance among the four transistors, improving circuit stability and accuracy.
• High performance: Provides high voltage and current handling capabilities for various applications.
• Easy to use: Standard DIP package simplifies assembly and prototyping.
• Cost-effective: Offers a cost-effective solution for applications requiring multiple transistors.

Additional Details:

Each transistor in the QTC4N28 has a collector current (IC) rating of 100mA and a power dissipation of 625mW per transistor. The current gain (hFE) is typically in the range of 100 to 300. The device is designed for operation in the -55°C to +150°C temperature range. It is commonly used in analog and digital circuits. The QTC4N28's matched characteristics make it suitable for applications where precise control and stable performance are critical. Its high voltage and current capabilities allow it to drive a variety of loads.