2N5087 Pinout, Equivalent, Application, Datasheet

The 2N5087 pinout follows the Emitter–Base–Collector (E–B–C) sequence when the flat side of its TO-92 package faces you.
The 2N5087 PNP transistor is a low-noise, high-gain small-signal amplifier device designed for audio preamplifiers, tone-control stages, and signal conditioning circuits.
It can handle up to –100 mA collector current and –50 V collector-emitter voltage, providing reliable performance for low-current amplification and switching applications.

Because of its low noise figure and excellent frequency response, the 2N5087 is ideal for high-fidelity audio equipment, sensor signal amplifiers, and instrumentation preamps requiring precise and stable operation.

Introduction to 2N5087 PNP Transistor

The 2N5087 transistor is a silicon planar PNP bipolar junction transistor (BJT) commonly used for low-level audio signal amplification.
It exhibits a high DC gain (hFE) ranging from 250 to 800, making it very effective for microphone preamps, equalizers, and active filters.

This transistor operates efficiently in class-A and class-AB amplifier configurations, ensuring minimal distortion and high linearity.
Its TO-92 package makes it easy to integrate into compact circuits for both DIY projects and professional designs.

2N5087 PNP Transistor

Pinout of 2N5087

Understanding the 2N5087 Pinout Configuration

The 2N5087 pin configuration is straightforward, following the standard E–B–C layout when viewed from the front (flat face toward you).

Pin Configuration of 2N5087 Pinout

This simple pin layout makes 2N5087 a convenient choice for replacing other TO-92 PNP transistors in existing circuits.

Key Features of 2N5087 Transistor

• Low-noise, high-gain PNP transistor for precision signal stages
• Excellent temperature stability for reliable long-term operation
• Ideal for low-current amplifier and switching applications
• Compact TO-92 package for easy PCB mounting
• Wide frequency bandwidth suitable for audio and low-frequency RF use
• Designed for high-gain low-distortion circuits

2N5087 Transistor Datasheet and Specifications

• Collector–Emitter Voltage (Vce): –50 V
• Collector–Base Voltage (Vcb): –50 V
• Emitter–Base Voltage (Veb): –5 V
• Collector Current (Ic): –100 mA
• Power Dissipation (Pc): 625 mW
• DC Current Gain (hFE): 250 – 800 (typical)
• Transition Frequency (fT): 100 MHz (typical)
• Polarity Type: PNP
• Package Type: TO-92 (Plastic)
• Pin Layout: Emitter–Base–Collector (E–B–C)

Working Principle of 2N5087 PNP Transistor

The 2N5087 functions as a current-controlled device where a small base current regulates a larger emitter-collector current.
When the base is made more negative relative to the emitter by about 0.7 V, the transistor enters its active region and conducts.

This allows the 2N5087 to amplify small input signals into larger output signals or operate as an ON/OFF switch in digital control circuits.
Because of its low noise and high gain characteristics, it delivers clear and accurate signal reproduction in sensitive amplifier stages.

More Circuit Layouts

Typical Applications of 2N5087

• Audio preamplifiers and low-level amplifier stages
• Tone-control and equalizer circuits
• Active filter and feedback amplifier designs
• Analog signal processing modules
• Low-current switching applications
• Sensor and instrumentation amplifier circuits

Equivalent Transistors and Alternatives

• 2N5086 – Low-noise PNP transistor with similar ratings
• BC558 – Common low-voltage audio amplifier transistor
• 2SA1015 – Japanese equivalent for small-signal PNP use
• A733 – Alternative PNP transistor for low-current operation
• S8550 – General-purpose replacement transistor

Frequently Asked Questions (FAQ)

What is the maximum collector current of 2N5087?

The maximum collector current is –100 mA, suitable for small-signal circuits.

What is the typical gain range of 2N5087?

Its DC gain (hFE) typically ranges between 250 and 800, ensuring high-sensitivity amplification.

What is the 2N5087 pin configuration?

The 2N5087 pinout is Emitter–Base–Collector (E–B–C) when viewed from the flat side.

What is the package type of 2N5087?

The transistor comes in a TO-92 plastic package for through-hole mounting.

What are common applications of 2N5087?

Used in audio preamps, sensor amplifiers, and low-current switches where clean signal output is needed.

Conclusion

The 2N5087 PNP transistor is a reliable, low-noise small-signal amplifier widely used in audio and instrumentation circuits.
It provides excellent voltage handling (–50 V), moderate current capacity (–100 mA), and high gain, making it ideal for high-fidelity audio amplification and low-distortion analog designs.
Compact, efficient, and easy to use, the 2N5087 remains one of the best PNP transistors for both professional and educational electronics projects.

Datasheet & Pinout of 2N5087 PNP Transistor

Click the following Button to download the datasheet of 2N5087 Transistor :

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