2N2221AUB-Transistor NPN Amplifier Switch | TO-92 Package | ON Semiconductor

2N2221AUB-Transistor Overview

The 2N2221AUB transistor is a widely used NPN bipolar junction transistor (BJT) designed for general-purpose amplification and switching applications. It delivers reliable performance with a maximum collector current of 800mA and a collector-emitter voltage rating of 40V, making it suitable for medium power circuits. Its complementary robustness and moderate gain characteristic ensure stable operation in various industrial and commercial electronics systems. With a TO-92 package for easy integration, this transistor is an effective choice for engineers seeking a versatile, cost-efficient solution. For sourcing and technical details, visit IC Manufacturer.

2N2221AUB-Transistor Technical Specifications

Parameter	Specification
Transistor Type	NPN Bipolar Junction Transistor
Collector-Emitter Voltage (VCEO)	40 V
Collector-Base Voltage (VCBO)	75 V
Emitter-Base Voltage (VEBO)	6 V
Collector Current (IC)	800 mA
Power Dissipation (Ptot)	625 mW
DC Current Gain (hFE)	100 ?C 300 (depending on collector current)
Transition Frequency (fT)	250 MHz (typical)
Package Type	TO-92, plastic encapsulated

2N2221AUB-Transistor Key Features

• High Collector Current Capability: Supports up to 800 mA, enabling efficient switching and amplification in moderate power circuits.
• Wide Voltage Ratings: Collector-emitter voltage up to 40 V allows operation in diverse industrial voltage environments.
• High Transition Frequency: Typical 250 MHz frequency ensures suitability for high-speed switching and signal amplification.
• Reliable Thermal Performance: Power dissipation rating of 625 mW supports stable operation under continuous load conditions.

Typical Applications

• General-purpose switching in industrial control circuits where moderate voltage and current handling is required, ensuring reliable performance in automation systems.
• Signal amplification in audio and radio frequency circuits, benefiting from its high transition frequency and gain characteristics.
• Driver transistor stages for relay control and LED switching, providing sufficient current drive and voltage tolerance.
• Low-power motor control circuits where compact packaging and dependable switching behavior are essential.

2N2221AUB-Transistor Advantages vs Typical Alternatives

This transistor offers a balanced combination of moderate voltage ratings and high collector current capability, outperforming many low-power transistors in switching speed and current handling. Its high transition frequency and robust gain provide improved amplification accuracy compared to generic alternatives. Packaged in a compact TO-92 casing, it integrates easily into densely populated boards, delivering reliable thermal performance for industrial applications.

2N2221AUB-Transistor Brand Info

The 2N2221AUB transistor is a standard product manufactured by multiple semiconductor companies, including well-established brands known for quality and reliability in discrete components. It is part of a legacy product family widely recognized for its versatility and consistent electrical characteristics. These manufacturers adhere to strict quality control and testing standards to ensure compliance with industry performance benchmarks, making the device a trusted choice for engineers and sourcing specialists worldwide.

FAQ

What is the maximum collector current for the 2N2221AUB transistor?

The maximum collector current rating for this transistor is 800 milliamperes (mA). This allows it to handle moderate loads suitable for switching and amplification in various electronic circuits without risk of damage.

Can this transistor be used in high-frequency applications?

Yes, with a typical transition frequency of around 250 MHz, it is capable of operating effectively in high-frequency