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LM386 Low Voltage Audio Amplifier IC

  • Supply Voltage: 4-15V
  • Quiescent Power: 24mW @ 6V
  • Analog input voltage 0.4V (maximum)
  • Voltage Gain: 20 to 200 (26dB to 46dB)
  • PSRR: 50dB
  • Speaker impedance 4Ω
  • Available in 8-Pin PDIP,SOIC and VSSOP packages

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LM386 Audio Amplifier IC

The LM386 is a low power audio frequency amplifier which is very commonly used in small audio amplifiers. The IC consumes very less power and hence can be operated using a 9V battery easily. It can easily drive an 8-ohm speaker with a variable gain of 20 to200. Volume control and gain control is also possible in this. The IC comes in an 8-pin PDIP package and requires very fewer components to function hence it is highly easy to use. ( find out a wide range of OP-AMP at

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. For driving heavy speakers you have to use the power amplifier ICs..

386 Pin Configuration



Pin Number Pin Name Description
1,8 GAIN Used to set the gain of the IC by connecting to a Capacitor
2 Inverting Input (IN-) The Inverting Pin of the amplifier is normally grounded
3 Non-Inverting Input (IN+) The Non-Inverting pin is provided with the audio signal
4 Ground The ground pin is connected to the ground of the system
5 Vout Provides amplified audio output, connected to a speaker
6 Vss/Vcc Connected to power
7 Bypass Bypass pin is used for connecting a decoupling capacitor

How to use the LM386 IC

The LM386 only requires a couple of capacitors and resistors to start working. A very basic commonly used LM386 circuit is shown below.









The IC is powered using the pin 6 (typically 5 or 9V) and the ground pin 4 is connected to the ground. The inverting pin (pin 2) is normally grounded and the Non-inverting pin (pin 3) 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.

The pin 1 and pin 8 are used to set the gain of the Amplifier. If there is nothing connected between these pins then the default gain will be 26 dB, but we can connect a 10 uF capacitor across it to get the maximum gain of the IC which is 46dB. The pin 7 is used to connect a filtering capacitor (0.1uf) for our amplifier IC to avoid unnecessary oscillations.  The amplified audio signal can be obtained from pin 5 which is connected to an 8-ohm speaker through a filtering capacitor. The RC network with 0.05uF and 10k resistor is optional.

 features and specifications

  • Supply Voltage: 4-15V
  • Quiescent Power: 24mW @ 6V
  • Analog input voltage 0.4V (maximum)
  • Voltage Gain: 20 to 200 (26dB to 46dB)
  • PSRR: 50dB
  • Speaker impedance 4Ω
  • Available in 8-Pin PDIP, SOIC and VSSOP packages


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

Package Includes :

1 x LM386 Low Voltage Audio Amplifier IC


Package/Case PDIP-8
Mounting Type Through Hole
Amplifier Type Low Voltage Audio Power Amplifier
 Supply Voltage 4-15V
Quiescent Power  24mW @ 6V
Analog input voltage  0.4V (maximum)
Voltage Gain 20 to 200 (26dB to 46dB)
Speaker impedance 4Ω
Input Bias Current 250 nA
Slew Rate (SR) 0.3 V/us
CMRR 65 dB to 80 dB
Voltage Gain (dB) 100 dB
Technology Bipolar
Operating Temperature Range 0ºC to 70ºC
Dimensions (mm) LxWxH 9.81 x 6.35 x 4.57


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