2N2221AL-Transistor NPN Amplifier Transistor by ON Semiconductor – TO-18 Package

2N2221AL-Transistor Overview

The 2N2221AL transistor is a widely used NPN bipolar junction transistor (BJT) suitable for general-purpose amplification and switching applications. It offers reliable switching performance and moderate gain characteristics, making it an ideal choice for low-power signal amplification and medium-current switching circuits. Designed to support collector currents up to 800mA and voltages up to 40V, this transistor delivers robust operation in industrial control, signal processing, and driver circuits. Engineers and sourcing specialists can depend on its proven stability and consistent electrical parameters for robust design implementations. For detailed product sourcing, visit IC Üreticisi.

2N2221AL-Transistor Key Features

• High collector current capacity: Supports up to 800mA, enabling effective control of moderate power loads.
• Moderate voltage rating: Withstands collector-emitter voltages up to 40V, suitable for a broad range of low to medium voltage applications.
• Reliable gain performance: Offers typical DC current gain (hFE) in the range of 35 to 300, ensuring consistent amplification behavior.
• Fast switching speed: Suitable for switching frequencies up to several MHz, beneficial in digital and signal processing circuits.

2N2221AL-Transistor Technical Specifications

Parametre	Şartname
Type	NPN Bipolar Bağlantı Transistörü
Kollektör-Emitter Gerilimi (Vce)	40 V (max)
Collector-Base Voltage (Vcb)	75 V (max)
Emitter-Base Voltage (Veb)	6 V (max)
Kollektör Akımı (Ic)	800 mA (max)
DC Akım Kazancı (hFE)	35 to 300 (depending on Ic and test conditions)
Geçiş Frekansı (fT)	Up to 250 MHz (typical)
Power Dissipation (Pc)	500 mW (max)
Paket Tipi	TO-18 Metal Kutu

2N2221AL-Transistor Advantages vs Typical Alternatives

This transistor offers a well-balanced combination of moderate voltage and current ratings with reliable gain, making it advantageous over alternatives with lower current capacity or slower switching speeds. Its metal can TO-18 package enhances thermal dissipation and mechanical durability for industrial environments. The broad gain range allows flexible circuit design, while its fast switching capability supports efficient signal processing and switching functions with enhanced reliability.

Tipik Uygulamalar

• Switching and amplification in low to medium power analog circuits, such as driver stages for relays and LEDs, where reliable current handling and gain are essential.
• Signal processing circuits in industrial control systems requiring fast switching and stable gain performance.
• General-purpose amplification in audio and sensor interface circuits demanding moderate power handling.
• Low-level switching applications in embedded and discrete control modules, benefiting from the transistor??s robust voltage and current ratings.

2N2221AL-Transistor Brand Info

The 2N2221AL is a well-established transistor variant widely recognized across multiple semiconductor manufacturers for its dependable performance and consistent quality. Packaged in a TO-18 metal can, it is preferred in industrial and professional electronic designs due to its superior thermal characteristics and mechanical robustness. This product line has been a standard choice for decades, supported by comprehensive datasheets and global availability, making it a trustworthy component for engineers and sourcing specialists focused on quality and reliability.

SSS

Bu transistör için maksimum kollektör akım değeri nedir?

The maximum collector current rating is 800 milliamperes (mA). This allows the transistor to handle moderate current loads typical in switching and amplification applications without compromising reliability.

Which package type is used for this transistor, and why is it important?

This transistor is housed in a TO-18 metal can package. The metal can provides better thermal dissipation compared to plastic packages, enhancing durability and performance stability in demanding industrial environments.

Bu transistör yüksek frekanslı uygulamalar için kullanılabilir mi?

Yes, it supports a transition frequency (fT) typically up to 250 MHz, making it suitable for moderate to high-frequency switching and amplification tasks in analog and digital circuits.

What voltage levels can this transistor safely operate at?

It can handle a collector-emitter voltage (Vce) up to 40 volts and a collector-base voltage (Vcb) up to 75 volts, accommodating a wide range of low to medium voltage applications without breakdown.

How does the DC current gain vary for this transistor?

The DC current gain (hFE) varies between 35 and 300, depending on the collector current and specific test conditions. This range allows flexibility in circuit design for amplification and switching efficiency.