Part Number: LM386M-1/NOPB

Manufacturer: Texas Instruments


Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of LM386M-1/NOPB

Datasheet  LM386M-1/NOPB datasheet
Category Integrated Circuits (ICs)
Family Linear – Amplifiers – Audio
Manufacturer Texas Instruments
Packaging Tube
Part Status Active
Type Class AB
Output Type 1-Channel (Mono)
Max Output Power x Channels @ Load 325mW x 1 @ 8 Ohm
Voltage – Supply 4 V ~ 12 V
Mounting Type Surface Mount
Operating Temperature 0°C ~ 70°C (TA)
Supplier Device Package 8-SOIC
Package / Case 8-SOIC (0.154″, 3.90mm Width)

LM386M-1/NOPB Introduction

The LM386M-1/NOPB is a low-voltage audio power amplifier chip used in many electronic devices like radios, portable speakers, and guitar amplifiers. It is made to amplify high-quality sound with few external parts, and it can run on a single power supply with a voltage as low as 4V.

The LM386M-1/NOPB is important because it makes it easy and cheap to boost the sound in various applications. It is especially helpful for devices that run on batteries and must be careful about how much power they use. Also, because it is small and easy to use, it is a great choice for hobbyists and do-it-yourselfers who want to make their own audio amplifiers.

LM386M-1/NOPB Description

Power amplifiers called LM386M-1 and LM386MX-1 are made for low-voltage consumer applications. The gain is internally set to 20 to reduce the number of external parts. Still, adding an external resistor and capacitor between pins 1 and 8 may increase the gain to any value between 20 and 200. While the output is automatically biased to half the supply voltage, the inputs are grounded referenced. The LM386M-1 and LM386MX-1 are perfect for battery operation because their quiescent power drain while using a 6-V supply is only 24 mW.


  • Powered by batteries.
  • Minimal Exterior Components.
  • A wide supply voltage range is available: 4 V–12 V or 5 V–18 V.
  • 4 mA is the Low Quiescent Current Drain.
  • Gains in voltage between 20 and 200.
  • input that is grounded.
  • offered in an 8-Pin MSOP package.

Detailed Description

A mono low voltage amplifier with numerous applications is the LM386. It can move loads that are between 4 and 32. The gain is set to 20 by default, but a resistor and capacitor placed between pins 1 and 8 can change it from 20 to 200. This device comes in three different 8-pin packages, including PDIP, SOIC, and VSSOP, so it can be used in different situations.

Device Functional Modes

Being an Op Amp, this device can be used in various ways to suit various purposes. Thanks to the internal gain-adjusting resistor, the LM386 can be utilized in systems with a very low part count. Moreover, the strength and frequency response can be changed for particular applications by adding a series resistor between pins 1 and 5.

Technical specifications for the LM386M-1/NOPB:

  • 4V to 12V is the operating voltage range.
  • 325mW at 6V and 10% THD, and 500mW at 9V and 10% THD are the output powers.
  • 50k is the input impedance.
  • 20 dB to 200 dB of gain.
  • At 1 kHz and 300 Hz, respectively, total harmonic distortion is 0.2% and 0.5%.
  • Response to frequencies: 40Hz to 15kHz.
  • 4mA is the quiescent current drain.
  • -40°C to 85°C is the operating temperature range.

The LM386M-1/NOPB is a single-channel amplifier with a fixed gain of 20dB, it should be noted. But, the gain can be raised by incorporating other parts like resistors and capacitors. A shutdown pin on the chip can reduce power usage while the amplifier is not operating.

Pin configuration

  • The LM386M-1/NOPB has eight pins in a DIP (Dual In-Line Package) format. Here’s what each pin is for and how it works:
  • Pin 1: Gain control The gain of the amplifier can be changed by moving this pin. To set the gain, it should be hooked up to a resistor.
  • Pin 2: Input. This is where the sound goes into the amplifier. A capacitor should be used to connect the audio signal to this pin.
  • Pin 3: GND. This is the amplifier’s ground pin. It should be connected to the power source and the ground of the audio source.
  • Pin 4: V+ (positive power supply) (positive power supply). This is the power supply pin for the amplifier that gives it power. It should be hooked up to the power supply’s positive end.
  • Pin 5: V- (negative power supply) (negative power supply). This is the amplifier’s power supply pin that goes to the ground. It should be hooked up to the power supply’s negative end.
  • Pin 6: Output. This is where the amplifier sends the sound. A coupling capacitor can connect the amplified sound signal to a speaker or headphones.
  • Pin 7: Bypass. This pin is used to get around the internal decoupling capacitor for the power supply. It should be hooked up to an external capacitor for better noise performance.
  • Pin 8: Gain control 2. The gain of the amplifier is changed by moving this pin. To set the gain, it should be hooked up to a resistor.

It’s important to remember that the LM386M-1/NOPB is a mono amplifier, meaning it can only boost one audio channel at a time. Also, the amplifier circuit should be set up with the right decoupling and grounding techniques to reduce noise and distortion.


In conclusion, the LM386M-1/NOPB is a low-voltage audio power amplifier chip that can boost sound quality with a few extra parts. It is perfect for radios, portable speakers, and guitar amplifiers because it is small, uses little power, and is easy to use. The LM386M-1/NOPB is easy to use because it only has eight pins in a DIP package. It can work from 4V to 12V, has a gain control range of 20dB to 200dB, and can put out up to 500mW of power at 9V and 10% THD. Proper grounding and decoupling techniques should be used to cut down on noise and distortion in the amplifier circuit.

One of the best things about the LM386M-1/NOPB is that it gives you much control over the gain. It has a fixed gain of 20dB, but the gain can be increased by adding resistors and capacitors from the outside. This means that the amplifier can be changed to fit different needs. The LM386M-1/NOPB is a great recommendation for hobbyists and do-it-yourselfers who want to build their own audio amplifiers. It is also useful for devices that run on batteries and must be careful about how much power they use. It can also be used with other audio parts, like microphones and equalizers, to make more complicated sound systems.

Overall, the LM386M-1/NOPB is a reliable and flexible audio amplifier chip that can be used to make a high-quality sound louder in a way that is easy and cheap.

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