A1015 Pnp Transistor

A1015 PNP Transistor – Low-Noise Audio Frequency Amplifier & General-Purpose Switch

The A1015 PNP transistor (2SA1015) is a general-purpose, low-noise amplifier transistor commonly used in audio frequency applications and switching circuits. With excellent current gain (hFE) and low power dissipation, it’s ideal for hobbyist electronics, educational projects, and commercial amplifier designs.

Whether you’re building signal amplifiers, tone control boards, or LED flashers, the A1015 offers reliability and performance in a compact TO-92 package.

📌 Pin Configuration (TO-92 Package)

⚙️ Key Features & Technical Specifications

• Transistor Type: PNP (p-n-p)

• Power Dissipation: 400mW (0.4W)

• Collector Current (Ic): 150mA

• Collector-Emitter Voltage (Vceo): 50V

• Low Noise Figure: 1dB – Ideal for audio applications

• DC Current Gain (hFE): Ranges from 140 to 700 based on group (O, Y, G, L)

• Base-Emitter Voltage (Vbe): 1.45V max

• Collector-Emitter Saturation Voltage (Vce sat): 0.3V max

• Base-Emitter Saturation Voltage (Vbe sat): 1.1V max

• Package Type: TO-92 Molded Plastic

• Operating Temperature: -55°C to +150°C

• Complementary Pair: Works with NPN 2SC1815

📈 Gain Classification Groups

Gain Formula:
hFE = IC / IB
Where:

• IC = Collector Current

• IB = Base Current

🔧 Applications – Where to Use the A1015?

• 🎙️ Audio Frequency Amplifiers (tone controls, mic preamps)

• 💡 LED Flashers and Blinkers

• 🔁 Switching Circuits in automation and control

• 📻 Signal Processing for radio and audio systems

• 📚 Educational Projects and electronics prototyping

💡 Sample Use Case – LED Flasher Circuit

The A1015 transistor can be used in a basic LED flasher circuit:

• Q1 acts as a timing switch controlled by the charge/discharge of capacitor C1

• Q2 amplifies current to drive an LED

• As C1 charges, it biases Q1, allowing Q2 to conduct and light the LED

• Once C1 discharges, Q1 turns off, and Q2 stops conducting

• This cycle repeats, flashing the LED at regular intervals

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