2N4919 Pinout, Equivalent, Application, Datasheet

The 2N4919 pinout follows the Emitter–Collector–Base (E–C–B) configuration in a TO-126 package, making it easy to identify for circuit assembly and testing. The 2N4919 PNP transistor is a silicon-based medium-power transistor designed for audio amplifier stages, driver circuits, and low-frequency power control applications. With a collector–emitter voltage of -60V, a collector current of 1A, and power dissipation up to 30W, it provides excellent electrical performance and stability in both audio frequency and switching circuits.

Known for its thermal stability, high reliability, and low distortion, the 2N4919 is an ideal choice for engineers designing medium-power amplifiers and audio drivers.

Introduction to 2N4919 PNP Transistor

The 2N4919 transistor is part of a silicon PNP transistor family known for moderate voltage and high-efficiency performance. It operates at -60V collector-emitter voltage, allowing it to handle higher voltage circuits compared to its predecessor 2N4918.
This transistor’s low saturation voltage and high current handling capacity make it suitable for push-pull output stages, linear amplifiers, and general-purpose switching circuits.

With its TO-126 package, it offers good thermal dissipation and compact size — making it ideal for audio amplifiers, signal drivers, and regulated power control designs.

2N4919 PNP Transistor

Pinout of 2N4919

Understanding the 2N4919 Pinout Configuration

The 2N4919 uses a 3-pin layout, which is Emitter–Collector–Base (E–C–B) from left to right when viewed from the front flat face.
This configuration helps in quick identification during circuit design, especially in amplifier and driver applications where PNP transistors are paired with NPN counterparts.

Pin Configuration of 2N4919 Pinout

Key Features of 2N4919 Transistor

• Medium-power PNP transistor for audio and switching circuits
• Low collector-emitter saturation voltage for efficiency
• Excellent linear gain ensures minimal distortion
• High reliability and thermal stability under load
• TO-126 package provides compact heat dissipation
• Suitable for complementary push-pull stages

2N4919 Transistor Datasheet and Specifications

• Collector–Emitter Voltage (Vce): -60V
• Collector–Base Voltage (Vcb): -60V
• Emitter–Base Voltage (Veb): -5V
• Collector Current (Ic): 1.0A
• Power Dissipation (Pc): 30W
• DC Current Gain (hFE): 30 to 180
• Transition Frequency (fT): 3 MHz (typical)
• Polarity: PNP
• Package Type: TO-126
• Pin Configuration: Emitter–Collector–Base (E–C–B)

Working Principle of 2N4919 PNP Transistor

The 2N4919 operates on the bipolar junction transistor (BJT) principle.
When a small base current flows in the reverse direction (from base to emitter), it allows a larger current to pass from emitter to collector.
This transistor acts as a current amplifier, producing a larger output signal from a smaller input signal.

Due to its low power loss and stable operation at medium voltages, it is widely used in driver stages, signal amplifiers, and audio output circuits.
The 2N4919 PNP transistor is particularly reliable in circuits that require moderate power with high voltage isolation.

More Circuit Layouts

Typical Applications of 2N4919

• Audio amplifier output stages
• Low-frequency linear amplifiers
• Switching circuits and drivers
• Class B push-pull configurations
• Power regulators and low-voltage supplies
• Signal and analog processing circuits

Equivalent Transistors and Alternatives

• BD242 – PNP transistor alternative with similar voltage
• MJ2955 – High current power transistor equivalent
• TIP32C – Medium-power alternative for general use
• BD140 – Common TO-126 PNP alternative
• 2N2905A – Lower current PNP transistor substitute

Comparison Summary – 2N4919 vs 2N4918 vs 2N4920

The 2N4919, 2N4918, and 2N4920 belong to the same transistor series, differing mainly by voltage rating.
The 2N4918 handles up to -40V, the 2N4919 up to -60V, and the 2N4920 up to -80V, with similar current and power capabilities across all three.

In practical terms, 2N4919 offers a middle-ground performance — balancing voltage tolerance and power dissipation without excessive heat generation.
While 2N4918 is used in low-voltage amplifier circuits, 2N4919 is preferred for medium-voltage applications, and 2N4920 suits high-voltage driver and output circuits.

All three share similar gain ranges, same E–C–B pin configuration, and TO-126 packaging, making them easy substitutes in most designs depending on voltage requirements.

Frequently Asked Questions (FAQ)

What is the maximum collector current of 2N4919?

The maximum collector current is 1.0A, ideal for medium-power circuits.

What is the voltage rating of 2N4919?

The transistor supports up to -60V collector-emitter and -60V collector-base voltage.

What is the 2N4919 pin configuration?

The 2N4919 pinout is Emitter–Collector–Base (E–C–B) when facing the flat front side.

What is the power dissipation of 2N4919?

It can dissipate up to 30W of power with proper heat sinking.

Can 2N4919 replace 2N4918 or 2N4920?

Yes. 2N4919 can replace either 2N4918 or 2N4920 depending on circuit voltage. It’s best suited for circuits requiring -60V operation.

Conclusion

The 2N4919 PNP transistor offers reliable medium-power performance in a compact TO-126 package.
It bridges the gap between the 2N4918 (-40V) and 2N4920 (-80V) models, delivering excellent efficiency and thermal balance for amplifiers, regulators, and driver circuits.
With its E–C–B pin layout, low distortion, and wide applicability, the 2N4919 transistor remains a popular choice for engineers and hobbyists designing analog and audio systems.

Datasheet & Pinout of 2N4919 PNP Transistor

Click the following Button to download the datasheet of 2N4919 Transistor :

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