2N4922 Pinout, Equivalent, Application, Datasheet

The 2N4922 pinout refers to its Emitter–Collector–Base (E–C–B) configuration, typical for TO-126 package NPN power transistors. The 2N4922 transistor is designed for medium-power switching and amplifier circuits, offering a collector-emitter voltage of 60V, collector-base voltage of 60V, and a collector current capacity of 1 ampere. With a maximum power dissipation of 30 watts, it is ideal for applications where moderate current and voltage handling are required without excessive heat buildup.

Introduction to 2N4922 NPN Transistor

The 2N4922 is a robust NPN silicon transistor engineered to handle medium-power operations in electronic circuits. It is widely used in audio amplifiers, motor drivers, and voltage regulator systems due to its dependable switching speed and stable gain characteristics. The transistor’s TO-126 package provides efficient thermal conduction, allowing it to perform reliably even under extended load conditions.

With a maximum collector-emitter voltage of 60V and a collector current of 1A, the 2N4922 NPN transistor performs efficiently in both analog and digital environments. Its low saturation voltage and consistent gain make it suitable for precise signal amplification and medium-load driving applications.

2N4922 NPN Transistor

Pinout of 2N4922

Understanding the 2N4922 Pinout Configuration

The 2N4922 transistor pinout follows the Emitter–Collector–Base (E–C–B) sequence when viewed from the front (flat side facing you, leads downward). This configuration simplifies its use on printed circuit boards and ensures compatibility with similar TO-126 NPN power transistors.

Pin Configuration of 2N4922 Pinout

Key Features of 2N4922 Transistor

• Medium-power NPN silicon transistor
• High-voltage handling capability up to 60V
• Suitable for switching and amplification
• Reliable performance in linear and digital circuits
• Compact and thermally efficient TO-126 package
• Stable current gain across varying load conditions

2N4922 Transistor Datasheet and Specifications

• Transistor Type: NPN Silicon
• Collector–Emitter Voltage (Vce): 60V
• Collector–Base Voltage (Vcb): 60V
• Collector Current (Ic): 1.0A
• Power Dissipation (Ptot): 30W
• DC Current Gain (hFE): 40 – 160 (typical range)
• Transition Frequency (fT): Approx. 3 MHz
• Junction Temperature (Tj): 150°C (maximum)
• Package Type: TO-126
• Pin Configuration: Emitter–Collector–Base (E–C–B)

Working Principle of 2N4922 NPN Transistor

The 2N4922 NPN transistor operates as a current-controlled device in which a small base current controls a much larger collector current. When a positive voltage is applied to the base relative to the emitter, it allows current to flow from collector to emitter. This behavior enables the transistor to act as both a switch and an amplifier, depending on circuit design.

In switching mode, it can control medium-power loads such as relays, LEDs, or DC motors, while in amplifier mode, it can amplify low-level analog signals in audio or instrumentation circuits. The transistor’s balanced gain and voltage tolerance make it suitable for compact and reliable designs.

More Circuit Layouts

Typical Applications of 2N4922

• Audio preamplifiers and signal amplifiers
• Voltage regulator and DC motor control circuits
• Relay and solenoid driver systems
• Medium-power switching circuits
• Low-frequency oscillator and pulse amplifier designs
• General-purpose NPN transistor for educational and industrial use

Equivalent Transistors and Alternatives

If the 2N4922 transistor is not available, several equivalent transistors with similar ratings can be used as substitutes, provided their pin configuration and thermal ratings are verified.

Common replacements include:

• BD139 – slightly higher power dissipation and voltage rating
• MJE180 – medium-power NPN with similar characteristics
• TIP29A – compatible voltage and current range, TO-220 package
• 2N2222A – smaller, suitable for low-current applications

These alternatives can serve as functional substitutes for similar circuit designs.

Frequently Asked Questions (FAQ)

What is the 2N4922 transistor used for?

It is commonly used in medium-power amplifier and switching applications.

What type of transistor is 2N4922?

The 2N4922 is an NPN bipolar junction transistor (BJT).

What is the pin configuration of 2N4922?

It has an Emitter–Collector–Base (E–C–B) pin sequence in a TO-126 package.

Can I replace 2N4922 with BD139?

Yes, BD139 can replace 2N4922 in most circuits if the pinout is matched correctly.

Is 2N4922 suitable for amplifier circuits?

Yes, its consistent current gain and power capacity make it excellent for low- and medium-power amplifier circuits.

Conclusion

The 2N4922 NPN transistor is a reliable medium-power device with a collector-emitter voltage of 60V, collector current of 1A, and power dissipation of 30W. Its TO-126 package ensures excellent thermal performance, while the E–C–B pinout offers easy integration in various electronic designs. The transistor’s versatility, stability, and compact form make it suitable for numerous switching, regulation, and amplification applications in both educational and professional electronic projects.

Datasheet & Pinout of 2N4922 PNP Transistor

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