A1015 Transistor Datasheet, Equivalent, Pinout, Circuit & Uses

Published:April 02, 2024

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PNP (Positive-Negative-Positive) transistors are one of the two main types of bipolar junction transistors (BJTs). They play a crucial role in amplification and switching applications. The A1015 is a commonly used PNP bipolar junction transistor (BJT) in electronic circuits for various applications. In this article, we'll delve into the A1015 datasheet, pinout, circuit, equivalent, uses, and more details. Everything you need to know about this PNP transistor.



Description of A1015 Transistor

The A1015 is a general-purpose PNP transistor designed for low-power amplification and switching applications. It is housed in a TO-92 package, making it suitable for use in compact electronic devices. The transistor has a maximum collector current (Ic) of 150mA, making it suitable for low- to medium-current applications. The A1015 transistor is renowned for its reliability and versatility, particularly in applications requiring low power and voltage.


A1015 Pinout


A1015 Pin Diagram


A1015 Pin Configuration


Pin No. Pin Name Description
1 Emitter The emitter is for the external association of current.
2 Collector The collector is for the current inward drive. It is related to the load.
3 Base The base administers the biasing of the transistor. It vagaries the state of the transistor.


The A1015 transistor typically comes in a TO-92 package, which is a widely used package for small signal transistors. It has three pins, each serving a specific function:

  • Emitter (E, Pin 1): The emitter is the pin through which the current enters the transistor. It is typically connected to the ground or the negative side of the circuit.
  • Collector (C, Pin 2): In most circuit configurations, the collector is the pin that connects to the positive supply voltage. It is where the output current flows out of the transistor.
  • Base (B, Pin 3): The base is the transistor's control pin. By applying a small current or voltage at the base, the transistor can be switched on or off, controlling the larger current flowing between the collector and emitter.


A1015 CAD Model



Features and Specifications


Type Parameter
Transistor Type PNP
Maximum Collector Power Dissipation: Pc 0.4watts
Maximum Collector-Emitter Voltage: Vceo 50V
Maximum Collector Current: Ic  150mA
Low Noise 1dB
DC Current Gain: hfe 70 ~ 400
Collector-Base Voltage: Vcb -50 V
Collector-Emitter Voltage: Vce -50 V
Emitter-Base Voltage: Veb -5 V
Maximum Collector Current: Ic max -150 mA
Collector Emitter and Collector Base breakdown voltage 50Vdc
Base Emitter Saturation Voltage 1.1Vdc
Collector Emitter Saturation Voltage 0.3Vdc
Base Emitter voltage 1.45Vdc
Operating Temperature and Storage Temperature -55℃ to +150℃
Transition Frequency: ft 80 MHz
Package / Case TO-92
Complementary Transistor 2SC1815


Absolute Maximum Ratings (Ta = 25°C)



Electrical Characteristics (Ta = 25°C)



A1015 Equivalent/Alternative

The A1015 transistor has several replacements that offer similar functionality and performance. Some of these equivalents/replacements include:


Equivalent Parts Description Application
NTE290A General-purpose PNP transistor Various electronic circuits
2SA495 Low-frequency PNP transistor Audio amplification, low-frequency applications
2SA561 High-voltage PNP transistor High-voltage switching applications
2SA564A High-gain PNP transistor Applications requiring high gain
2SA573 Low-power PNP transistor Battery-powered applications
2SA675 High-speed PNP transistor High-frequency applications
2SA705 High-current PNP transistor Applications requiring high current
2SA999 High-power PNP transistor Power amplification applications
KSA1015 General-purpose PNP transistor Wide range of electronic circuits
KTA1015 High-frequency PNP transistor High-frequency applications
KTA1266 High-power PNP transistor Power amplification applications
KT3108A Low-noise PNP transistor Low-noise amplification applications
BC212 General-purpose PNP transistor Wide range of electronic circuits
BC257 Low-power PNP transistor Battery-powered applications
BC307 High-speed PNP transistor High-frequency applications
BC557 General-purpose PNP transistor Wide range of electronic circuits
2N3494 High-power PNP transistor Power amplification applications
2SA781 High-speed PNP transistor High-frequency applications
2SA1015 General-purpose PNP transistor Wide range of electronic circuits
2SA1267 High-gain PNP transistor Applications requiring high gain
2SB560 High-voltage PNP transistor High-voltage switching applications


A1015 Circuit Diagram


  • A1015 Transistor Amplifier


The diagram depicts an amplifier circuit utilizing A1015 and C1815 transistors.

This circuit functions as a push-pull AB class amplifier, employing two transistors as amplifying elements and two antiparallel diodes for complementary operation.

When an audio signal is input into the circuit, it initially passes through an input capacitor. The two transistors then amplify the signal. The push-pull action of the A1015 and C1815 transistors significantly amplifies the audio signal, considering its unique characteristics.


  • Water Level Indication with A1015


This water level indication circuit utilizes three PNP transistor switches. Each transistor activates its respective LED when current is supplied to its base through the water via the electrode probes.

As the water level increases, the base of each transistor connects to a 9V DC source through the water and the corresponding probe. This causes the transistors to conduct and illuminate the LED, indicating the water level. Arrange the probes in sequence on a PVC pipe according to the depth and submerge it in the tank. The Red LED illuminates when the water level is low, the Yellow LED illuminates when the water level is medium, and the Green LED illuminates when the water tank is full.


Where to Use A1015?

The 2SA1015 is primarily used in audio frequency amplifier applications but can also be utilized for switching, similar to other PNP transistors. When employed as an audio frequency general-purpose amplifier, it operates in the active region. This transistor is categorized into four groups based on the DC gain: O, Y, G, and L, with DC gains of 140, 240, 400, and 700, respectively.


Group DC current gain (hfe)
O 140
Y 240
G 400
L 700


The amplification factor is typically expressed in terms of power. To calculate the current gain, the formula used is:


Gain (hfe) = IC / IB


Where IC is the collector current, and IB is the base current of the circuit.


How to Use A1015?

In the circuit diagram below, an LED flasher circuit using the 2SA1015 transistor is illustrated. Capacitor C1 and resistor R1 are utilized as a frequency generator for the Q1 transistor, which acts as a switch for Q2. Q2, in turn, is responsible for increasing the current. Initially, Q1 conducts as the voltage across C1 rises, allowing current to flow through R2, the LED, and Q2, causing the LED to turn on.

As capacitor C1 discharges through resistor R1 over time, there is a point when C1 is fully discharged. At this stage, there is no voltage biasing the base terminal of Q1, causing Q1 to cease conducting. Consequently, Q2 also stops functioning. As a result, the LED turns off. Subsequently, C1 begins to charge again, restarting the cycle. This continuous process of turning the LED on and off creates the flashing effect.



A1015 Application


Audio Amplification:

The A1015 transistor is widely utilized in audio amplifiers due to its ability to amplify audio signals with minimal distortion and noise. It plays a crucial role in enhancing the strength of audio signals, ensuring clear and high-quality sound output.



In electronic circuits, the A1015 transistor serves as a reliable switch, controlling the flow of current. Its efficient switching action enables precise control over various electronic devices, enhancing their overall performance and functionality.


Driver Stage Amplifier Action:

When incorporated as a driver stage in amplifier circuits, the A1015 transistor provides essential current and voltage amplification. This critical function ensures that the amplifier operates efficiently, delivering optimal performance in audio and other signal amplification applications.


AF Amplifier:

Specifically designed for audio frequency (AF) amplification, the A1015 transistor is ideal for use in amplifiers that enhance audio signals for playback through speakers or headphones. Its high-performance capabilities make it a preferred choice for achieving superior sound quality in audio systems.


Darlington Pair:

By configuring the A1015 transistor in a Darlington pair, it is possible to achieve higher current gain and improved performance in amplifier circuits. This configuration enhances the transistor's ability to amplify signals effectively, making it suitable for a wide range of applications requiring high-performance amplification.


LED Flasher:

The A1015 transistor is commonly employed in LED flasher circuits, controlling the flashing of LEDs in various applications such as automotive turn signals or warning lights. Its efficient operation ensures reliable and consistent flashing, enhancing the signaling system's visibility and safety.


Water Level Indicator:

In water level indicator circuits, the A1015 transistor plays a crucial role in detecting the level of water in a tank or reservoir. Its precise and reliable operation ensures accurate monitoring of water levels, enabling efficient management of water resources.


Driver Circuits:

The A1015 transistor is essential in driver circuits, where it drives other components such as relays, motors, or other transistors. Its robust design and reliable performance make it an ideal choice for controlling various electronic devices, ensuring smooth and efficient operation.


A1015 Package



A1015 Datasheet

Download A1015 Datasheet PDF.


A1015 vs. 2N3906 vs. BC557

The A1015, 2N3906, and BC557 are all PNP (Positive-Negative-Positive) transistors with varying specifications, including maximum collector current, voltage ratings, current gain, etc.

Characteristic A1015 2N3906 BC557
Polarity PNP PNP PNP
Maximum Collector Current (IC) 150 mA 200 mA 100 mA
Maximum Collector-Base Voltage (VCBO) 50 V 40 V 50 V
Maximum Collector-Emitter Voltage (VCEO) 50 V 40 V 45 V
Maximum Emitter-Base Voltage (VEBO) 5 V 5 V 5 V
DC Current Gain (hFE) Range 70 - 400 100 - 300 125 - 900
Power Dissipation (PD) 400 mW 625 mW 625 mW
Transition Frequency (fT) 80 MHz 250 MHz 100 MHz
Package Type TO-92 TO-92 TO-92
Common Uses Audio amplifiers, voltage regulators, low-power applications Switching and amplification circuits Audio amplifiers, voltage regulators, low-power applications
Advantages High current gain, low saturation voltage Low noise, high current capability High current gain, low noise


These differences make each transistor suitable for specific applications, ranging from audio amplification and voltage regulation (A1015) to high-speed switching (2N3906) and low-power amplification (BC557). Understanding these distinctions is crucial for selecting the right transistor for a given electronic circuit.


Final Words

In summary, the A1015 PNP transistor is a versatile component with significant importance in various electronic circuits. Its ability to amplify signals, switch loads, and regulate voltages makes it a valuable asset in electronics design. Its reliable performance and versatility make it a popular choice among electronics enthusiasts and professionals alike. As technology continues to advance, the A1015 transistor is expected to remain relevant in future electronic designs, contributing to further innovations in the field.


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  • What is the A1015 transistor used for?

    The A1015 transistor is commonly used in audio frequency amplifier applications.

  • What is the price of the A1015 transistor?

    The A1015 transistor is available on AliExpress at prices ranging from $0.17 to $1.54 per lot, depending on the quantity. For more competitive prices, feel free to request a quote (RFQ) at Xecor.

  • What is the voltage of A1015?

    The maximum voltage is 50 V.

  • How does a PNP transistor work?

    In a PNP transistor, applying a small negative voltage to the base-emitter junction forward-biases the junction. This enables holes to flow from the emitter, composed of P-type material, to the base, which is made of N-type material.

  • Why would you use a PNP transistor?

    PNP transistors can be used to amplify the voltage or current of a signal.

  • Which is better, NPN or PNP transistors?

    PNP transistors offer the advantage of a lower turn-on voltage, making them well-suited for high-speed applications. On the other hand, NPN transistors have a higher current-carrying capacity, making them more suitable for low-power applications.

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