2SA1015 Transistor : Pin Configuration & Its Applications

A 2SA1015 transistor is a PNP bipolar junction transistor with less frequency and this transistor is generally used for amplification purposes. This kind of transistor mainly includes a semiconductor doped with ‘N’ that exists in between the two P-doped material layers. This transistor is available in the TO-92 Package.

In some cases, the prefix of 2SA1015 Transistor like ‘2S’ is not available on the packaged but is marked like A1015. This article discusses an overview of the 2SA1015 transistor which includes a pin configuration, features, specifications, circuit working & its applications.

What is 2SA1015 Transistor?

2sa1015 is a PNP transistor including three terminals like a normal transistor namely emitter, base & collector. This transistor is mainly designed to use for general purpose amplification purposes. In this PNP transistor, the ‘N’ layer signifies the base terminal whereas the two ‘P’ terminals signify emitter & collector terminals.

As compared to the emitter terminal, the base terminal is negative always because it is a BJT. So, the conduction can be carried out through both major and minor charge carriers like holes and electrons. In the PNP transistor, the majority of charge carriers are generally holes.

Once the negative voltage is provided at the base terminal then it can be biased and the flow of current will be there from emitter terminal to collector. This transistor works like a current control device as a small current at the base terminal is utilized to control the huge current at the two remaining terminals.

In this transistors ‘P,’ terminal shows the applied polarity at the emitter terminal like positive (+) whereas ‘N’ layer shows the polarity applied at the base terminal like a negative (-). When the base terminal of the transistor is negative then only the flow of current will be there as compared to the emitter terminal.


Further, this kind of transistor is divided into 4 groups based on the DC gain like O, Y, G & L. The DC gains of these groups are; O-140, Y-240, G-400 & L-700. Generally, the amplification factor can be determined mainly in terms of power to calculate the current gain by using the following formula.

Gain (hfe) = IC/IB

In the above equation, the collector current is “IC” & the base current is ‘IB” of the circuit.

Pin Configuration

The pin configuration of the 2SA1015 transistor is shown below. This transistor includes three terminals which are discussed below.

2SA1015 Pin Configuration
2SA1015 Pin Configuration
  • Pin1 (Emitter): The flow of current will be drained in throughout the emitter
  • Pin2 (Collector): The current supply out throughout the collector terminal
  • Pin3 (Base): This terminal controls the flow of current in between two terminals like Emitter (E) & Collector (C).


The features & specifications of the 2SA1015 transistor include the following.

  • The type of transistor is PNP
  • It is available in a TO-92 package
  • Power dissipation is 0.4W
  • Less frequency is 1dB
  • The maximum voltage is (Vceo) is 50v
  • The maximum current is (Ic) is 150mA
  • Case material is molded plastic
  • Dissipation of collector terminal is 400mW
  • Gain of DC is 400
  • The breakdown voltage of CE & CB is 50v DC
  • The saturation voltage of EB is 1.1v DC
  • The saturation voltage of CE is 0.3v DC
  • VEB is 1.45Vdc
  • Operating & storage temperature ranges from -55℃ to +150℃
  • VCE is -50 V
  • VCB is -50 V
  • VEB is -5 V
  • Collector Current (CC) is 0.15 A
  • The transition frequency is 80 MHz
  • The noise figure is 1 dB

The replacement & alternate 2sa1015 transistors are 2SA1013, KST93, 1275, KSA1013/KTA1275.
The SMD version of 2sa1015 is LT1-BA or 2SA1015 to SOT23 SMD. Complement of a 2SA1015 transistor is 2SC2383. Equivalent 2SA1015 transistors are; 2SA495, 2SA564A, 2SA675, 2SA561, NTE290A, 2SA850, BC257, BC307, BC557, 2SA999, 2SA705, BC558, 2SA781, BC559, BC212, 2SA573, 2N3494, KTA1015 & KT3108A.

How to use a 2SA1015 Transistor/Circuit Diagram

The circuit diagram of the LED flasher using a 2SA1015 transistor is shown below. In this circuit, this transistor plays a key role. The required components to build this circuit mainly include capacitors like C1 & C2 like 200 uF & 1uF, resistors R1 & R2 like 2M, & 200 Ohms, Darlington transistor pairs – 2SA1015 & 3V battery.

LED Flasher Circuit using 2SA1015 Transistor
LED Flasher Circuit using 2SA1015 Transistor

In the above circuit, R1 and C1 are used as frequency generators toward the Q1 transistor & used as a switch for second transistor-like Q2. Here the second transistor is mainly used to enhance the flow of current. From the C1 capacitor throughout the R2 resistor & LED, the first transistor will function until the drop of voltage enhances beyond the C1 capacitor. Thus, the Q2 transistor conducting will start & current supplies throughout LED to switch ON.

When capacitor ‘C1’ is discharged throughout the resistor ‘R1’ in a fixed period, while ‘C1’ discharges then there is no force to bias the ‘Q1’ transistor’s base terminal. Therefore, the Q1 transistor will stop working along with ‘Q2’. So, LED will be switched OFF & capacitor ‘C1’ again starts working. This cycle will continue frequently to turn ON/ OFF the LED to seem like a LED flasher.

Where to use 2SA1015 Transistor/Applications

The applications of the 2SA1015 transistor include the following.

  • The 2SA1015transistor is used in the applications of audio-frequency amplifiers.
  • It is used for switching purposes similar to PNP.
  • Once it is used like an audio frequency-based general purpose amplifier, then it operates in the active region.
  • Switching
  • It is used to make an LED flasher circuit
  • AF Amplifier
  • Driver Stage Amplifier Action
  • It is used like Darlington pair
  • These types of transistors are extensively used in the amplification of voltage & power.
  • Once these transistors are integrated with the NPN type, then they will make an ideal bond & current starts flowing from both faces of transistors like PNP & NPN.

Thus, this is all about an overview of the 2SA1015 transistor datasheet which includes its pin configuration, features, specifications, circuit working, and its applications. This transistor is used in AF amplifier and switching applications. The pin configuration of this transistor mainly varies based on the manufacturer. The main difference between PNP & NPN transistors is; they work similarly but current directions and voltage polarity will be opposite in PNP as compared to NPN. Here is a question for you, what are the advantages of the 2SA1015 transistor??