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NTE123AP NPN Audio Amplifier Transistor

[Click the image to enlarge it]

The NTE123AP is a NPN Transistor with collector current of 600mA and Base voltage of 6V. It has a gain value of 100 to 300 and hence can be used in low power audio circuits.


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



·         NPN Audio Amplifier Transistor

·         Current Gain (hFE), 100 to 300

·         Continuous Collector current (IC) is 600mA

·         Collector-Emitter voltage (VCEO) is 40 V

·         Collector-Base voltage (VCB0) is 60V

·         Emitter Base Voltage (VBE0) is 6V

·         Transition Frequency 250MHz

·         Available in To-92 Package


Note: Complete Technical Details can be found at the NTE123AP datasheet given at the end of this page.

Equivalent for NTE123AP:  BC547,2N222, 2N5089

Complementary PNP of NTE123AP: NTE159


Brief Description on NTE123AP

The NTE123AP is a NPN Audio Amplifier transistor with a maximum gain of 300. The transistor also has a good collector current value of 600mA and can be toggled with a base voltage of only 6V making it suitable for switching applications. These transistors are commonly used in place of BC547 or 2N2222 when they are not available. But it is not a direct replacement so refer the datasheet to make sure it suits your design. The 2N5089 Transistor form the 2N series can be assumed as a direct replacement for the NTE123AP transistor.

The transistor also has its complementary PNP part, the NTE159 transistor hence can be used in push pull or other amplifier circuits. The NTE123AP transistor is commonly confused with NTE123A, both these transistor are completely different in specs. The NTE123AP comes in a TO-92 package while the NTE123A comes in a metal can TO-18 package.



  • Switching small loads

  • Small signal amplifiers

  •  Darlington pair

  • Microphone circuits

  • Audio Noise filters


2D model of the component

If you are designing a PCD or Perf board with this component then the following picture from the Datasheet will be useful to know its package type and dimensions.

 NTE123AP NPN Audio Amplifier Transistor 2-D Model


Component Datasheet