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LM380 2.5W Audio Power Amplifier

The LM380 is a 2.5W power audio amplifier for consumer applications. In order to hold system costs to a minimum, the gain is internally fixed at 34 dB. The output of LM380 is short circuit proof with internal thermal limiting.


Pin Description of LM380 IC

Pin Number

Pin Name




Bypass pin is used for connecting a decoupling capacitor


Non-Inverting Input (IN+)

The Non-Inverting pin is provided with the audio signal

3,4,5,7, 10, 11, 12


Ground Pins


Inverting Input (IN-)

The Inverting Pin of an amplifier is normally grounded



The output pin of the amplifier



Connected to power

9, 13


Not Connected


LM380 Audio amplifier features and specifications

  • Supply Voltage: 10-22V
  • Quiescent Power: 0.13W @ 18V
  • Voltage Gain: Fixed at 50
  • High Peak Current Capability: 1.3A
  • Input Referenced to GND
  • High Input Impedance: 150kΩ
  • Low Distortion
  • Quiescent Output Voltage is at One-Half of the Supply Voltage
  • Available in 8-Pin & 14- Pin PDIP packages


Equivalent for LM380: LM386

Alternatives Audio Amplifiers: LM4871, AD620, IC6283, JRC45558


Where to use the LM380 Audio Amplifier

The LM380 is a low power audio amplifier used especially for power audio amplification purposes. The IC comes in 8-pin and 14-pin PDIP package and has a wide operating range hence it is highly easy to use. This IC can easily drive an 8-ohm speaker with a variable gain of 20 to200. The IC


So, if you are looking for an audio amplifier IC which can be powered using a battery for a portable application to drive an 8-ohm speaker then this IC might be the right choice for you.


How to use LM380 Audio Amplifier IC

The LM380 only requires a couple of capacitors and resistors to start working. A very basic commonly used circuit for LM380 is shown below.

                          LM380 Internal Circuit

The IC is powered using the pin 14 and the ground pin 4 is connected to the ground. The inverting pin is normally grounded and the Non-inverting pin is provided with the audio signal. This audio signal can be from a microphone or even from a 3.5mm jack. The 10k resistor is added in series with the audio signal to act as a volume control. You can ignore this potentiometer if you want to operate in full volume. This IC comes with a fixed voltage gain of 50dB.


Applications of LM380

  • AM and FM Radio amplifiers
  • Portable music players
  • Low Power Audio amplifiers
  • Wien bridge oscillator
  • Power Amplifiers
  • Audio boosters


2D-Model of LM380

LM380 Dimensions

Component Datasheet

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