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MPSA18 NPN Low Noise Transistor

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The MPSA18 is a General Purpose NPN Transistor which can operate with low noise and high gain. The transistor has a gain value of 500 to 1500 and can operate at a voltage of 45V with 200mA load current.


Pin Configuration

Pin Number

Pin Name




Current Drains out through emitter, normally connected to ground



Controls the biasing of transistor, Used to turn ON or OFF the transistor



Current flows in through collector, normally connected to load



·         General purpose NPN Transistor

·         Low Noise and High Gain

·         DC Current Gain (hFE) 500 to 1500

·         Continuous Collector current (IC) is 200 mA

·         Collector-Emitter voltage (VCE) is 45V

·         Collector-Base voltage (VCB) is 45V

·         Emitter-Base voltage (VEB) is 7V

·         Transition Frequency: 160MHz

·         Available in To-92 Package

Note: Complete Technical Details can be found at the MPSA18 Transistor datasheet give at the end of this page.

Equivalent for MPSA13: 2N5088, BC550C, NTE47, KSP06


MPSA18 Transistor Brief Intro

The MPSA18 is a NPN General Purpose Transistor with a low noise high gain property. Meaning it can amplify even a very low power signal with a good signal to noise ratio. As we know an amplifier amplifies both the signal and noise of the input signal, a low noise transistor like MPS18 can be used to build Low Noise Amplifiers (LNA) which can avoid the noise being amplified and thus providing a good signal to noise ratio even at high gain. Hence the MPS18 can be found in most low power audio amplifier circuits.

Apart from this, the transistor also can be used for general purpose switching applications.  It can switch loads upto 45V with a load current of 200mA. The base can be triggered with 7V to control the switching of the transistor.




  • Low Power Amplifier Designs

  • Output stage of Amplifiers

  • General purpose switching

  • Audio amplifiers



2D dimensions will help you in placing this component at the time of making circuit on perf board or a PCB.

 MPSA18 NPN Low Noise Transistor 2D Model


Component Datasheet