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C1815 NPN Audio Frequency Amplifier Transistor ( Pack of 3 )

Specification	Details
Transistor Polarity	NPN
Package Type	TO-92
Collector-Base Voltage ($V_{CBO}$)	60V
Collector-Emitter Voltage ($V_{CEO}$)	50V
Collector Current ($I_C$)	150mA
DC Current Gain ($h_{FE}$)	70 to 700 (Classification Dependent)
Transition Frequency ($f_T$)	80 MHz (Minimum)

Price

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₹ 8.47

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Product Description

The C1815 is a classic NPN epitaxial silicon transistor designed for use in audio frequency amplifiers and high-speed switching circuits. Known for its high reliability and excellent linearity, it is a staple in the electronics industry for low-noise pre-amplifier stages and signal processing. Its ability to handle up to 50V $V_{CEO}$ makes it versatile for various logic-level applications and small-signal amplification. The C1815 is the NPN complement to the A1015 PNP transistor, allowing engineers to design efficient push-pull amplifier stages and complementary symmetry circuits.

Key Features

Low Noise Figure: Specifically engineered for high-fidelity audio applications, ensuring minimal hiss and interference in signal amplification.
High DC Current Gain: Offers a wide range of $h_{FE}$, making it easy to drive even with very small base currents.
Excellent Linearity: Provides a consistent gain across a range of collector currents, essential for reducing distortion in audio circuits.
High-Speed Switching: With a transition frequency of 80 MHz, it is capable of fast switching in digital logic and pulse-handling circuits.
Compact TO-92 Package: The small footprint and through-hole design make it perfect for breadboarding, educational kits, and space-constrained PCBs.

Technical Details

Power Dissipation ($P_C$): 400mW.
Emitter-Base Voltage ($V_{EBO}$): 5V.
Operating Junction Temperature: -55°C to +150°C.

Prototyping and Engineering Tips from Robogears

Pinout Identification: CRITICAL: Looking at the flat side of the C1815 with the leads pointing down, the pinout order is Emitter (1), Collector (2), and Base (3). This is often different from American-standard transistors like the 2N3904 (E-B-C); always double-check your connections to avoid damaging the component.
Complementary Pairing: For building a Class AB audio power amplifier, pair this NPN transistor with its PNP counterpart, the A1015. This combination allows for symmetrical amplification of the positive and negative cycles of an audio waveform.
Switching Application: When using the C1815 as a switch for a small load (like an LED or a small relay), use a 1kΩ to 10kΩ Base Resistor to protect the base-emitter junction from excessive current while ensuring the transistor enters "Saturation" mode.
Heat Dissipation: While rated for 400mW, it is best practice to keep the continuous load well below this limit. If the transistor case feels hot to the touch during operation, you are likely exceeding its current or power limits and should consider a larger transistor like the TIP122 or BD139.
Gain Grouping: C1815 transistors often come with a suffix (O, Y, G, L) indicating their gain (hFE) range. For precision audio work, try to use transistors from the same gain group to maintain balance between stereo channels.

Package Includes

3 x C1815 NPN Audio Frequency Amplifier Transistors

Disclaimer: Product images are shown for illustrative purposes only. The exact markings on the transistor body or the manufacturer's logo may vary slightly between manufacturing batches, but all technical specifications and C1815 performance standards remain as described.

Safety Warning: Do not exceed the 150mA collector current limit. When switching inductive loads like relays or small DC motors, always place a Flyback Diode (such as a 1N4148 or 1N4007) in parallel with the load to prevent high-voltage back-EMF from destroying the transistor.