MPSA44 Transistor Pinout, Equivalents, Features, Applications and Other Important Details

The MPSA44 is a commonly used NPN silicon transistor. Here's the information you requested:


The pinout configuration of the MPSA44 transistor is as follows:

  1. Emitter (E)
  2. Base (B)
  3. Collector (C)


Equivalent Transistors:

The MPSA44 transistor's equivalents include:

  • PN2907
  • BC327
  • 2N3906

Please refer to their respective datasheets for detailed electrical characteristics and pin compatibility.


Here are some key features of the MPSA44 transistor:

  • Polarity: NPN (Negative-Positive-Negative)
  • Power Dissipation: The maximum power dissipation of the transistor is typically around 625 mW.
  • Collector Current: The maximum collector current (Ic) that the transistor can handle is approximately 500 mA.
  • Collector-Emitter Voltage: The maximum voltage that can be applied across the collector-emitter junction is typically around 45 Volts.
  • Transition Frequency: The MPSA44 transistor has a transition frequency (ft) of approximately 250 MHz, indicating its capability for higher frequency applications.
  • High Gain: It offers a high current gain (hFE) under appropriate biasing conditions, making it suitable for amplification purposes.
  • Fast Switching Speed: The MPSA44 has a relatively fast switching speed, which is beneficial in applications requiring quick switching between on and off states.


The MPSA44 transistor finds applications in a variety of electronic circuits, including:

  1. Amplification: It can be used in small-signal amplifiers, audio amplifiers, and other low-power amplification circuits where moderate power gains are required.
  2. Switching: The MPSA44 can function as a general-purpose switching transistor, enabling control over the flow of current in various electronic devices and circuits.
  3. Oscillators: It is suitable for use in oscillator circuits, including radio frequency (RF) oscillators, where high-frequency signal generation is necessary.
  4. LED Drivers: The MPSA44 can be utilized as an LED driver transistor, allowing control and regulation of current in LED lighting applications.
  5. Voltage Regulation: It can be employed in voltage regulator circuits to stabilize and regulate voltages in power supply applications.
  6. Digital Logic: The MPSA44 can be used in digital logic circuits as transistors for signal switching and driving.

Usage Recommendations:

Here are some general recommendations when using the MPSA44 transistor:

  • Consult the datasheet: Review the transistor's datasheet for comprehensive information on maximum ratings, electrical characteristics, and recommended usage guidelines specific to the MPSA44 transistor.
  • Biasing: Ensure proper biasing of the transistor to achieve desired amplification or switching characteristics. Refer to design guidelines and application notes.
  • Heat Dissipation: Consider the power dissipation of the transistor and ensure it is adequately mounted on a heat sink or thermal pad if required to prevent overheating.
  • Safe Operating Area: Ensure that the operating conditions (voltage, current, power) remain within the transistor's safe operating area (SOA) as specified in the datasheet.


Please note that the information provided is based on general knowledge of transistors and the available information in my database. For precise usage guidelines and specific circuit requirements, it is always recommended to refer to the transistor's datasheet and consult with design references or experts in the field.

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